Range Extender - Any Updates? (MAR 2025)

[VAF84]

I've got a Lightning, it thinks it's more like 3 steps down. Ford's software is like an unresponsive turtle at times.

100%!

I've got a Lightning, it thinks it's more like 3 steps down. Ford's software is like an unresponsive turtle at times.

Compared to Tesla, I agree. The Lightning is advanced by legacy automaker standards. The GMC is good by ICE tech standards. Again, someone coming from an ICE will like it. Someone already in the EV world will probably find it lacking.

Sponsored

 

[HaulingAss]

I believe the 4680 batteries were largely a fail, as truck range of 500 miles was loosely based on that technology.
let’s be real here. We’re realistically getting 75% or 200 miles out of these pacs now with highway. I doubt I would have ever considered this truck knowing this fact.

Huh? I get 270-300 Hwy miles out of my Cybertruck, which is exactly what I would expect of an EV rated for 318 combined CTY/HWY.

And it's far too soon to call 4680 batteries a "fail", we are only 4 1/2 years from their unveiling (which was 2 years before they went into production) and a year and a half short of the anticipated development time to fully reach the anticipated specs.

Yet you speak in the past tense, as if 4680 batteries are already done, but they are still improving incrementally.

BTW, Tesla is the only automaker to ever introduce a new lithium-ion cell format for EVs. It was invented at Tesla specifically for EVs. Now you can buy high-performance rechargeable LED flashlights that use the same cell format:

GT46 - Lumintop (just one example of many)

What cells did GM, Kia, Hyundai, Toyota, Honda, VW, etc. develop? Oh, that's right, none! All other lithium ion cylindrical cells were designed for other applications like laptops, etc. and were adapted for EVs. Watch, the other automakers will eventually use the 4680 cell format designed by Tesla. The 4680 is still a newborn, the 18650 cell format was invented by Sony in 1991 and is still improving. The 21700 cell format was co-developed by Panasonic and Tesla in 2017 and is still improving. Watch, the other automakers will eventually use the 4680 cell format designed by Tesla. See a pattern here?

Some failure!

 

[REM]

let’s be real here. We’re realistically getting 75% or 200 miles out of these pacs now with highway. I doubt I would have ever considered this truck knowing this fact.

Speak for yourself, I'm getting exactly the stated range. The 4680 cell format is revolutionary, and are still in extreme infancy. I think people have absolutely no idea how hard it is to incrementally improve battery tech over time.

Telsa is right on target. Anyone who tries to mass produce any other format than cylindrical will soon find out.

 

[OUTLAW]

Huh? I get 270-300 Hwy miles out of my Cybertruck, which is exactly what I would expect of an EV rated for 318 combined CTY/HWY.

And it's far too soon to call 4680 batteries a "fail", we are only 4 1/2 years from their unveiling (which was 2 years before they went into production) and a year and a half short of the anticipated development time to fully reach the anticipated specs.

Yet you speak in the past tense, as if 4680 batteries are already done, but they are still improving incrementally.

BTW, Tesla is the only automaker to ever introduce a new lithium-ion cell format for EVs. It was invented at Tesla specifically for EVs. Now you can buy high-performance rechargeable LED flashlights that use the same cell format:

GT46 - Lumintop (just one example of many)

What cells did GM, Kia, Hyundai, Toyota, Honda, VW, etc. develop? Oh, that's right, none! All other lithium ion cylindrical cells were designed for other applications like laptops, etc. and were adapted for EVs. Watch, the other automakers will eventually use the 4680 cell format designed by Tesla. The 4680 is still a newborn, the 18650 cell format was invented by Sony in 1991 and is still improving. The 21700 cell format was co-developed by Panasonic and Tesla in 2017 and is still improving. Watch, the other automakers will eventually use the 4680 cell format designed by Tesla. See a pattern here?

Some failure!

Oh, is there some secret program where they are improving the batteries because I haven’t seen anything. In fact my mileage is going from 300 miles to 295 in eight months just by charging at 80%

Look man I’m not going to argue with you, but you’re fng lying if you’re telling me that you’re getting 90% of the miles out of the battery because you’re not on the highway. And there is no innovation here ongoing at all. Every truck has 300 miles of supposed distance seriously man?

 

[dalton108]

Speak for yourself, I'm getting exactly the stated range. The 4680 cell format is revolutionary, and are still in extreme infancy. I think people have absolutely no idea how hard it is to incrementally improve battery tech over time.

Telsa is right on target. Anyone who tries to mass produce any other format than cylindrical will soon find out.

Oh, is there some secret program where they are improving the batteries because I haven’t seen anything. In fact my mileage is going from 300 miles to 295 in eight months just by charging at 80%

Look man I’m not going to argue with you, but you’re fng lying if you’re telling me that you’re getting 90% of the miles out of the battery because you’re not on the highway. And there is no innovation here ongoing at all. Every truck has 300 miles of supposed distance seriously man?

Currently in the middle of a brutal legislative session so I’m pretty satiated on fighting with people right now so I don’t really need to add to it with fighting with strangers in my off time on the interwebs, but @REM the one thing that I know that Elon has been criticized for and particularly by battery experts from China is that when it comes to batteries he doesn’t have a effing clue what he’s talking about not my words I’m paraphrasing theirs.

I am not an engineer. I don’t pretend to know anything about this my dad was an electrician and I know enough about electricity to issue some citations and teach people about the hazards of working with it from my time as an OSHA compliance officer, trainer and administrator. That’s it.

I think I’ve established that I’m pretty agnostic when it comes to Elon generally. So, I think we can keep the politics out of it.

So, when they say he’s absolutely categorically wrong, moving in the wrong direction and I think they’ve gone as far as to say “incompetent” coupled with the fact that they’re working on batteries that can be charged in 15 minutes from what I’ve read, why are they wrong?

In the meantime, I’m going to ask Chat (deep research) the same question and see what I can learn.

 

[REM]

the one thing that I know that Elon has been criticized for and particularly by battery experts from China is that when it comes to batteries he doesn’t have a effing clue what he’s talking about not my words I’m paraphrasing theirs.

Qualify your statements. What is Elon getting wrong on the 4680s?

 

[dalton108]

Qualify your statements. What is Elon getting wrong on the 4680s?

not my statement. I cited Chinese experts there’s a specific gentleman who said what I paraphrased right after battery day it was reported widely I’m not gonna do research right now. If you don’t want to answer that’s fine, but I’m not going to qualify statements that aren’t my own. Like I said I’ve run it through chat I’ll ask chat to find the exact quote and who said it but it’s out there.

I would kind of expect you to be aware of the criticisms that have been levied given your interest in the area which is really the only reason I posed the question to you.

Like I said, I really don’t have a position and I’m definitely not looking for a fight.

======================================================

ChatGPT 4.5 deep research just finished its response and I think it answers some of your questions it’s Long (I haven’t fully read it just scanned it and put it up unedited so I don’t know if it supports one side or the other) here you go:


Tesla’s 4680 Battery vs Chinese Innovations – Strategic Analysis


Figure: Tesla’s 4680 structural battery pack (left, with 830 large cylindrical cells) vs. BYD’s Blade battery pack (right, with many thin prismatic cells). Both designs eliminate traditional modules for improved integration.





Introduction





Tesla’s 4680 cylindrical battery cell (46 mm diameter, 80 mm height) represents a bold departure from prior EV battery formats. Unveiled at Tesla’s 2020 Battery Day, the 4680 was touted as a game-changer, promising five times the energy of smaller cells and major cost reductions through innovations like a tabless design and new manufacturing processes . However, in 2024 Chinese battery experts – including CATL’s founder Dr. Robin Zeng – openly criticized the 4680 approach, calling it a “bad bet” by Elon Musk . This report provides an expert-level analysis of Tesla’s 4680 cell format and its development trajectory, examining whether it is fundamentally flawed or strategically sound. We compare Tesla’s battery innovation (design, manufacturing, and charging performance) against leading Chinese technologies like CATL’s prismatic cell systems and ultra-fast charging solutions. We incorporate verifiable commentary from battery engineers and industry insiders on both sides of the debate, and evaluate if Chinese developers are credibly ahead of Tesla in performance, cost-efficiency, or fast-charging capabilities.





Tesla’s 4680 Cell – Design and Ambitions





Cell Format & Design: The Tesla 4680 is a large cylindrical Li-ion cell employing a novel “tabless” electrode design. By eliminating the traditional tab connectors, Tesla distributes current flow more evenly across the electrode sheet, reducing internal resistance and heat generation . The cell uses a high-nickel NCM811 cathode (nickel-cobalt-manganese) to maximize energy density, paired with a graphite-based anode (with silicon additives) for high capacity . According to a 2023 teardown study by independent German researchers (Fraunhofer IKTS and partners), Tesla’s 4680 cell achieved ~241 Wh/kg gravimetric energy density (≈643 Wh/L volumetric) – significantly higher than typical LFP cells – aligning with Tesla’s focus on range and performance. The large-format cylinder holds about 5× the volume of Tesla’s older 2170 cells, enabling fewer cells per pack for a given energy. Crucially, Tesla integrates 4680 cells into a structural battery pack (cells directly bonded into the vehicle chassis), eliminating modules and using the pack itself as part of the car’s structure for weight savings and simplified assembly .





Manufacturing Innovations: Tesla’s approach to 4680 production is as radical as the cell design. The company introduced a new dry-coating process for electrode fabrication (acquired via Maxwell Technologies) instead of the conventional wet slurry method . This dry process skips the solvent and lengthy drying steps, potentially cutting manufacturing cost and time dramatically. In theory, the 4680’s simpler pack (with 830 cells instead of ~4,400 in a Model Y pack) and tabless design also streamline production – weld points are slashed from 17,600 to about 1,660, reducing complexity . Tesla claimed that these innovations could halve the cost per kWh of the pack (an estimated $5,500 savings on a Model Y battery) , paving the way for a $25k affordable EV in the future . The 4680 cells are produced in-house (at Giga Texas and pilot lines), part of Tesla’s strategy to vertically integrate battery supply and secure a huge scale (targeting 500 GWh/yr production by 2030) .





Performance Targets: The 4680 format was envisioned to boost vehicle range and power. A larger cell with lower internal resistance can deliver high current, and Tesla intended the tabless 4680 to support faster Supercharging with less heat build-up. In practice, current Tesla vehicles (400 V architecture) charge at peak rates around 250–270 kW (~3C for a ~80 kWh pack), achieving 10–80% recharge in ~25 minutes. Elon Musk has hinted that 4680 packs will eventually enable faster charging and better energy density than any competitor. In late 2024, Tesla even stated that its 4680 cell would attain the industry’s lowest cost per kWh by year-end . These claims underscore Tesla’s confidence in the strategic value of the 4680 project – if executed successfully, it could secure a lead in battery cost-performance and reduce reliance on Asian suppliers.





Development Trajectory and Challenges





Ramp-up Difficulties: Despite its promise, the 4680 program has faced significant engineering and scaling challenges. Reports from mid-2022 onward indicate Tesla struggled to transition the dry electrode coating from lab to mass production. Reuters interviews with a dozen battery experts revealed that Tesla was “only halfway there” on its Battery Day goals by 2022, primarily because the dry-coating technique was causing low yields at volume . One expert noted Tesla could make 4680 cells in small batches, “but when they started big volume production, … ended up with many rejects, too many.” . By late 2022, Tesla had not met its timeline for volume production and had to delay the full rollout. Early 4680 cells used in a Texas-built Model Y (Standard Range) had lower-than-expected energy content and charging speed, suggesting Tesla took a conservative approach initially to optimize yields and pack integration. Manufacturing bottlenecks – especially with the dry electrode process – persisted into 2023, leading Tesla to poach outside experts to help solve the issues .





Performance Gaps: Initial 4680-based Model Y vehicles disappointed some expectations. Analyses showed the standard-range Model Y with 4680 cells achieved similar range to older long-range versions despite a structural pack (implying the 4680 cells at that point had no clear energy density advantage yet) . Charging curves observed by early owners indicated that the 4680 pack was no faster – and in some cases slower – to charge than Tesla’s 2170 packs, likely due to cautious software limits as Tesla refined thermal management. An industry teardown found the 4680 cell generates ~2.3× more heat per volume at 1C discharge compared to BYD’s Blade LFP cell , a consequence of its high energy, high-resistance chemistry, which demands very robust cooling. These early data points fueled skepticism that the 4680 was underdelivering on its revolutionary promises.





Tesla’s Progress: Tesla has made incremental improvements and still vigorously defends the 4680 strategy. By late 2023, Tesla announced it had produced its 100 millionth 4680 cell and was ramping production for the Cybertruck, which uses a 4680-based pack. Executives reported improved yields and throughput, claiming the cost per cell was steadily dropping and would beat outsourced cells within months . Indeed, even without full dry-coating success, Tesla reaped some benefits: using larger cells and structural packs already cut costs and simplified assembly. Experts note that going from 4,400 small cells per pack to 830 large cells (as Tesla did) is itself a big manufacturing win (fewer cells to handle and weld) . So far, however, these gains appear to be offset by the complexity of the new processes. One engineer summarized that “most of the [4680] advantages right now come from the bigger cell format,” while the novel dry process has yet to pay off . In short, Tesla’s development trajectory has been slower and more difficult than anticipated, but not necessarily a dead end – the company is investing heavily to fix the issues and still plans to make the 4680 the cornerstone of its future battery supply.





Criticisms from Chinese Battery Experts





Tesla’s challenges have not gone unnoticed by competitors, especially in China – the world’s EV battery powerhouse. In mid-2024, Dr. Robin Zeng, founder and chairman of CATL (Contemporary Amperex Technology Co. – the globe’s largest EV battery maker), made waves with unusually candid criticism of Tesla’s 4680 strategy. Zeng revealed that during Elon Musk’s visit to China, he told Musk directly that the bet on the 4680 cylindrical cell “is going to fail and never be successful.” This blunt statement from an industry leader underscores a viewpoint held by many Chinese battery engineers: that larger cylindrical cells are a fundamentally flawed path for EVs.





Zeng’s critique is rooted in both business and technical reasoning. He argued that Elon Musk “doesn’t know how to make a battery. It’s about electrochemistry,” suggesting that Tesla underestimated the chemistry challenges in scaling up the 4680 . In a heated debate with Musk, Zeng reportedly “showed him” why the 4680 approach was problematic, after which “[Musk] was silent.” Zeng pointed out that Musk habitually overpromises timelines, pushing 2-year targets for technologies that realistically need 5+ years – a management style that may have driven Tesla to attempt too much too quickly with the 4680. His core technical critique centers on the cell format: According to Zeng (who holds a PhD in physics and built CATL’s empire on prismatic cell tech), the cylindrical 4680 is intrinsically harder to scale and less optimal than prismatic cells. “We had a very big debate, and I showed him… He doesn’t know how to make a battery,” Zeng recounted .





Independent observers note that Zeng “is not an unbiased observer” – CATL is Tesla’s supplier and also a competitor (Tesla’s 4680 in-house efforts aim to reduce reliance on CATL). Nonetheless, Zeng’s technical arguments carry weight given CATL’s success. One engineer explained that large cylindrical cells face inherent longevity issues: as they charge/discharge, the jellyroll of electrodes swells against the rigid can, causing mechanical stress and micro-cracks over many cycles . Prismatic cells, by contrast, can accommodate swelling with less internal damage (their flat layers can expand slightly into any free volume). Over time, the stress in cylinders can lead to particle break-off, internal shorting, and faster capacity loss . This suggests that maintaining long cycle life in a big cylinder like 4680 may be harder without perfecting the chemistry and mechanical design (e.g. precise pre-loading of the jellyroll).





Other Chinese experts echo the sentiment that Tesla’s path is an “aberration” compared to the mainstream. The vast majority of new EVs in China (and indeed globally, outside Tesla) use either prismatic or pouch cells, not cylindrical. Even Tesla itself relies on CATL’s prismatic LFP cells for its standard-range models. From CATL’s perspective, most automakers prefer prismatic cells for their easier packaging and cooling at large sizes . Both CATL and BYD (China’s #2 battery firm) have achieved massive scale with prismatics, leading Zeng to call 4680 a “dead-end” that “won’t scale” to meet mass-market needs . In his view, Tesla’s insistence on cylindrical cells is a strategic misstep – one that ties up Tesla’s resources while Chinese companies forge ahead with proven, cost-effective technologies.





It’s important to note that not all analysts agree that 4680 is doomed. Some industry insiders defend Tesla’s approach, arguing that cylindrical cells have well-known advantages in manufacturability and reliability. For example, Panasonic and LG (major cell producers) have both invested in developing 4680-format cells for Tesla , suggesting confidence that the format can work if kinks are ironed out. Additionally, companies like BMW have announced adoption of large cylindrical cells (similar ~46mm diameter) for their next-gen EVs, contracting CATL and EVE Energy to supply them – an ironic twist, as Chinese firms themselves will produce cylindrical cells to meet Western OEM demand. These moves indicate that some engineers see merit in the 4680 approach’s potential for high energy and structural efficiency, even if CATL’s CEO publicly disparages it. Nonetheless, the criticisms from China highlight real challenges Tesla must overcome and underscore that time is of the essence – Chinese battery tech is advancing rapidly while Tesla perfects the 4680.





Chinese Battery Innovations: Prismatic Cells & Ultra-Fast Charging





While Tesla labored on the 4680, Chinese battery developers surged ahead on multiple fronts: cell chemistry, form-factor integration, and charging speeds. Two leading approaches in China are exemplified by CATL’s third-generation cell-to-pack (“Qilin”) batteries and BYD’s Blade battery. Both use prismatic cell formats (as opposed to cylindrical) and have been optimized for different priorities (energy density and fast charging for CATL; safety and cost-efficiency for BYD). In parallel, Chinese EV makers and battery firms have aggressively pursued ultra-fast charging solutions, leveraging high C-rate batteries and high-voltage architectures (800–900V systems) to slash charging times. Below we examine these innovations in detail.





CATL’s Cell-to-Pack (CTP) “Qilin” Battery





Design and Integration: CATL’s Qilin battery (CTP 3.0) is a prismatic-cell pack system launched in 2022–2023, representing the pinnacle of CATL’s pack integration tech. Qilin uses large prismatic NMC cells (or LFP for standard versions) directly integrated into the pack without modules – analogous to Tesla’s structural approach, but retaining a flat prism form factor. CATL achieved a record 72% volume utilization in the Qilin pack by tightly packing cells and embedding coolant interfaces between cells . (For comparison, Tesla’s 4680 structural pack is estimated to use ~63% of pack volume for cells ). This high integration yields exceptional energy density: up to 255 Wh/kg at the pack level for the NMC version – enough for 1000 km range in a large sedan under China’s testing. CATL themselves claim the Qilin pack offers “13% more power” output and better thermal performance than an equivalent 4680-based pack . The pack design spreads coolant across the cell surfaces, enabling uniform temperature control and safer operation under high loads.





Fast-Charging and Performance: One of Qilin’s hallmark features is fast-charge capability. Thanks to advanced cooling and cell design, Qilin-equipped vehicles have demonstrated remarkable charging speeds. For instance, a 102 kWh Qilin battery in a Li Auto MPV was shown charging 10% to 80% in just ~10.6 minutes – reaching charging power well above 400 kW (5C+ rates). CATL also introduced the “Shenxing” LFP cell (4C fast charging) as part of this family, which can add ~400 km range in 10 minutes . Real-world models like the Zeekr 001 (2024 update) use a 100 kWh CATL pack that charges 10–80% in ~11.5 minutes , making it one of the fastest-charging EVs on the market. To further push boundaries, CATL and SAIC recently announced a 6C fast-charging LFP pack for GM’s Ultium platform (900V) that can take ~200 km in 5 minutes (i.e. potentially full charge ~10 min) . These achievements highlight that Chinese firms are prioritizing charging speed as a competitive differentiator – leveraging high-power cell chemistry and high-voltage (800–900V) systems to dramatically cut charge times. Tesla, by contrast, has stuck with ~400V architecture and more moderate charging rates to date.





Chemistry and Cost: The CATL Qilin uses high-nickel chemistries for maximum energy in premium models, but CATL also offers an LFP version (~160 Wh/kg) for lower cost and long cycle life . CATL has unparalleled scale in both NMC and LFP production, giving it cost advantages. By late 2020s, CATL’s manufacturing expertise and China’s supply chain allowed it to achieve lower cell $/kWh costs than most. (Tesla’s own CFO acknowledged CATL’s LFP cells were the “cheapest form of energy storage” for standard-range cars in 2021.) The Qilin’s cell-to-pack approach further cuts cost by eliminating module components and simplifying assembly – similar in principle to Tesla’s structural pack cost savings. In fact, Tesla has partnered with CATL to use CATL’s pack technology at Giga Shanghai, and even licensed some manufacturing know-how for its U.S. factories . This underscores that CATL’s approach is considered highly effective, even by Tesla, when adapted to LFP chemistry for affordability.





BYD’s Blade Battery





Design and Safety: BYD’s Blade battery is a distinctive prismatic LFP battery launched in 2020 that emphasizes safety and cost. The “Blade” refers to the cell shape: an extremely long, thin prismatic cell (≈965 mm length, 90 mm height, 14 mm thick). These blade-like cells are arrayed in a pack without modules, providing structural support and a very high packing efficiency. The LFP chemistry (LiFePO₄) inherently offers high thermal stability – BYD famously demonstrated driving a nail through a Blade cell without it catching fire, a testament to its safety margin against thermal runaway. The Blade’s design helps dissipate heat and prevents propagation of fire if one cell did fail. BYD prioritized safety and longevity over absolute energy density: the Blade cell has about 160 Wh/kg energy density (roughly 30-40% less than high-nickel cells) , but it excels in durability (reportedly capable of 3000+ charge cycles) and is much cheaper due to the lack of nickel/cobalt .





Cost Efficiency: A teardown study in 2023 compared the Blade vs Tesla’s 4680 and found BYD’s material cost per kWh is around €10 lower than Tesla’s 4680 cell . This aligns with expectations: LFP materials are cheaper, and BYD’s massive scale and vertical integration (they produce everything from cathode powder to pack in-house) drive costs down. BYD uses simpler, established manufacturing techniques (coating, stacking) and avoids bleeding-edge processes that can cause yield problems. The result is a battery that is highly cost-competitive. In fact, BYD’s ability to sell EVs at lower price points with Blade batteries has helped it surpass Tesla in global EV sales (including hybrids) in recent years – a market validation of its strategy focusing on affordability and reliability. The Blade’s success has pushed many Chinese automakers to adopt LFP for mass-market models, even as Tesla also shifted its Standard Range cars to LFP packs from CATL.





Performance Trade-offs: The Blade’s LFP chemistry means lower energy density and a lower nominal voltage than NMC cells, which typically translates to slightly shorter range and slower charging for a given pack size. BYD’s current Blade-based EVs usually charge 10–80% in ~25–30 minutes – decent (thanks to cell-to-pack design reducing resistance), but not record-setting. However, BYD is not standing still on innovation. Reports indicate BYD is developing a “Blade 2.0” with higher energy and faster charging, potentially incorporating manganese doping or other tweaks to allow 6C charging like CATL’s plans . This new Blade 2.0, expected in 2024–25, aims to narrow the performance gap while retaining LFP’s cost and safety advantages. Also, BYD is exploring cell-to-chassis integration (embedding the Blade pack as part of the vehicle frame) in some luxury models, similar to Tesla’s structural concept, which could further improve weight and space efficiency. In summary, BYD’s Blade exemplifies the Chinese focus on pragmatic innovation – using robust chemistry and clever packaging to deliver a battery that is very safe and cheap, and gradually improving its performance.





Ultra-Fast Charging Race





Chinese companies are racing ahead in fast-charging technology, often outpacing Tesla in this area. The combination of high-C-rate battery cells and adoption of 800V+ vehicle architectures has led to multiple production EVs in China achieving <15 minute fast-charge times:


• CATL “Shenxing” 4C LFP Battery: Introduced in 2023, Shenxing is the world’s first LFP battery rated for 4C charge. It can add 400 km (250 miles) of range in 10 minutes of charging . First deployments (e.g. Changan Avatr 12 EV) are in early 2024, with promised 0–80% charge in about 15 minutes even in cold weather. This brings LFP, traditionally a slower-charging chemistry, into parity with or beyond NMC cells on charge speed.


• 5C and 6C Pack Introductions: The 2024 Zeekr 001 premium sedan uses a CATL 5C-capable pack (NMC chemistry) that charges 10–80% in 11.5 minutes . The Li Auto “Mega” MPV (2024) uses a 5C Qilin pack enabling 500 km added in 12 minutes . Building on this, CATL and SAIC-GM announced a 6C ultra-fast LFP battery (co-developed for GM’s Ultium platform) that can accept a full charge in ~10 minutes on a 900V system . This 6C battery – slated for 2024 release – is likely the second-gen Qilin or a new “Qilin 2.0” pack . BYD is similarly working on a 6C Blade 2.0. These advancements mean we will soon see EVs that charge nearly as fast as refueling an ICE vehicle – a ~10 minute full recharge.


• Charging Infrastructure: To leverage these batteries, Chinese companies are also deploying higher-powered chargers. Huawei unveiled a 600 kW DC fast charger in early 2023 (capable of ~4C on a 150 kWh pack) . State grids in China are upgrading freeway charging stations to 480 kW and above to support new 4C/5C EVs . In contrast, Tesla’s Supercharger V3 network is 250 kW (and the upcoming V4 is ~350 kW), which is sufficient for Tesla’s current ~3C charging needs but would be a bottleneck for 5-6C batteries. Thus, China is not only ahead in battery capability but also building the ecosystem to use it. This could give Chinese EV brands a perceived advantage (“charge in 10 minutes”) in the eyes of consumers.





In summary, Chinese battery developers (CATL, BYD, and others like CALB, GAC, Svolt) have been rapidly iterating on prismatic cell technology, pack integration, and charging speeds. They have focused on incremental but high-impact improvements – e.g. eliminating module waste, improving cooling, utilizing safer chemistries at scale, and embracing higher voltage systems – rather than attempting radically new manufacturing methods that might delay deployment. The result by 2025 is that Chinese companies lead in areas like cost per kWh and fast-charge performance, and they dominate global battery production volume. These developments form the backdrop for assessing Tesla’s 4680: is Tesla leaping ahead or falling behind?





Comparative Analysis: Tesla 4680 vs Leading Chinese Alternatives





To crystallize the differences, the table below compares key attributes of Tesla’s 4680 cylindrical cell approach with two leading Chinese battery solutions: CATL’s Qilin (prismatic NMC) for high performance and BYD’s Blade (prismatic LFP) for cost/safety. This highlights the trade-offs in format, chemistry, performance, and strategic positioning:

Aspect	Tesla 4680 (Cylindrical NCM)	CATL Qilin (Prismatic NMC)	BYD Blade (Prismatic LFP)
Cell Format & Design	Large cylindrical cell (46×80 mm) with tabless jelly-roll electrodes in a steel can. Used as a structural element in pack (cell bonding contributes to chassis stiffness) .	Large prismatic cells in a cell-to-pack architecture (no modules). Pack design optimized with ~72% volume utilization . Flat cells allow broad contact with cooling plates.	Long, thin prismatic (Blade) cells (~965×90×14 mm) inserted cross-wise in pack (also module-free). Pack provides structural support, though some models exploring full cell-to-chassis integration.
Chemistry	High-nickel NCM811 cathode, graphite/silicon anode. Aims for high energy and adequate power. (Tesla also uses NCA in other cells; 4680 likely similar performance)	High-nickel NMC cathode (for high-end versions; LFP option also available). Also experimenting with Mn-rich cathodes. Emphasis on versatile chemistry support in same form-factor.	LFP (LiFePO₄) cathode, graphite anode. Prioritizes stability and longevity over max energy. Low raw material cost (iron/phosphate, no Ni/Co). Future Blade 2.0 may add manganese to boost energy & voltage.
Energy Density	~241 Wh/kg (cell level) ; ~<200 Wh/kg at pack level initially (due to structural adhesives, etc.). Tesla claims potential >300 Wh/kg with future improvements.	Up to 255 Wh/kg (pack level) for NMC version – highest of current mass-produced packs. Achieved via high % of active material in pack. LFP version ~160 Wh/kg .	~160 Wh/kg (cell) ; ~140 Wh/kg pack. Energy density is lower, requiring larger pack for same range. BYD offsets this somewhat with very efficient motors and aero in vehicles.
Fast-Charging	Currently ~3C peak (e.g. Model Y 4680 ~250 kW on ~75 kWh pack). 10–80% typically ~25 min. Tabless design intended to reduce heat and allow higher C, but high-nickel chem limits extreme fast charge. Improvements expected, but no 4680 car yet beats 20-min 10–80% mark.	Up to 4–5C in today’s 3rd-gen packs (e.g. 10–80% in ~10–15 min) . Demonstrated 5C charging in production EVs (Zeekr, Li Auto). Next-gen 6C (~10 min full charge) slated by end of 2024 . Often uses 800–900V architecture to enable >350 kW charging.	~2–3C in current Blade packs (BYD Han EV charges ~30–40% in 10 min, ~60% in 20 min). Adequate for most users but slower than top NMC packs. However, Blade 2.0 aims for ~6C fast charge , which would bring LFP on par with the fastest.
Cycle Life & Degradation	Projected ~1,000 cycles to ~80% capacity (typical for NMC at high utilization). Uses advanced BMS to limit degradation (e.g. not charging to 100% daily). Tabless design may reduce localized stress, but large format could see higher strain per cycle (to be proven).	~1,000 cycles for NMC version (typical), potentially more if operated at partial SOC. Strong cooling and lower depth-of-discharge per cell (due to large pack sizes) can extend life. LFP Qilin can exceed 3,000 cycles easily. Overall good longevity expected, similar to other high-end packs.	2,000+ cycles to 80% is common (LFP inherently has excellent cycle life). BYD taxis with Blade batteries reportedly see minimal degradation after 200k+ km. Very resistant to thermal runaway and thus can endure abuse (fast charge, high temp) more safely, though extreme charging still shortens life.
Safety	Uses inert internal chemistry (but high Ni cathodes can be more reactive than LFP if abused). Strong steel can containment. Tesla’s pack design and software aggressively manage temps to prevent thermal issues. Track record of cylindrical cells is robust, but a cell thermal failure could generate significant heat due to larger cell size.	NMC chemistry is more volatile than LFP, but CATL’s design emphasizes cooling and isolation. Qilin pack has thermal buffer materials and rapid cooling to prevent propagation. CATL claims significantly improved thermal stability vs earlier packs . Several Chinese EVs with Qilin packs have scored well in safety tests.	LFP chemistry is intrinsically safer (stable crystal structure). Blade form factor further reduces risk – even in nail penetration tests, it did not ignite. BYD’s Blade packs have shown extreme abuse tolerance (fire, crushing) in demos. Overall among the safest EV batteries available, a key selling point.
Manufacturing & Scale	In-House Tesla production, but still ramping. Complex new processes (dry coating, laser tabless welding) caused low yields . By 2024, limited volumes (used in Model Y and new Cybertruck). Tesla aiming for mass scale, but currently still supplementing with supplier cells.	Mass production underway. CATL, the world’s #1 cell maker (~<40% global market share), is producing Qilin for multiple brands (e.g. Zeekr 009, 001, Li Auto) . Proven manufacturing (uses modified conventional processes). CATL can scale output rapidly given its enormous factories and resources.	Mass production since 2020. BYD manufactures Blade batteries for all its EVs (and supplies Toyota and others). BYD was the #2 global EV battery producer in 2023. Manufacturing is relatively straightforward (prismatic stacking + welding) with very high yield; BYD’s vertical integration gives tight quality control.
Cost per kWh	Aiming for high cost reduction (~$50–60/kWh cell cost target long-term). Currently likely higher than prismatic LFP cost due to lower yields and expensive metals. Tesla’s hope is that once perfected, 4680 will be cheapest for its class (high energy cells). Until then, Tesla even buys cheaper LFP packs from CATL for its lower-end models.	Competitive cost for a high-performance battery. CATL’s scale and manufacturing efficiency yield low $/kWh even for NMC. Still, NMC materials cost more than LFP. CATL offset this with pack-level simplification (CTP). For large orders (Tesla, etc.), CATL can offer very aggressive pricing due to economies of scale and domestic supply chain advantages.	Low cost leader. LFP material cost is ~30% lower than NMC, and Blade’s simplified design further cuts cost. The Fraunhofer teardown found Blade’s material cost per kWh was ~€10 lower than Tesla 4680’s . BYD’s huge volume and in-house cathode production drive costs down. This makes Blade batteries extremely attractive for mass-market EVs where price is key.

Table: Comparison of Tesla’s 4680 cylindrical cell approach vs CATL’s Qilin cell-to-pack and BYD’s Blade battery. Data compiled from teardown studies and manufacturer claims.





Expert Commentary: Flawed Bet or Strategic Vision?





The above analysis reveals stark contrasts between Tesla’s battery strategy and its Chinese counterparts. So, is Tesla’s 4680 trajectory fundamentally flawed or strategically sound? The answer may be nuanced.





Critics’ Perspective (Flawed Bet): Many experts, like CATL’s Zeng, view the 4680 as an over-ambitious gamble that distracted Tesla from readily available solutions. From this perspective, Tesla tried to “reinvent the wheel” in a highly optimized industry and hit foreseeable roadblocks. Chinese insiders point out that Tesla is years behind on adopting manufacturing refinements that already yield great results – e.g. CATL achieved similar or better pack performance with Qilin without exotic new processes. The fact that Tesla still relies on CATL and Panasonic cells for most of its production is telling; it suggests 4680 hasn’t delivered the step-change needed to outcompete the incumbents. Furthermore, the rise of BYD and CATL – who are now not just suppliers but rivals in EV sales and technology – indicates that Tesla may be ceding its early battery lead. In fast-charging, for example, Chinese EVs charging in 10–15 minutes make Tesla’s ~25 minute charge seem laggard. And on cost, Tesla’s hoped-for savings haven’t materialized yet, whereas Chinese battery costs keep dropping. In short, critics argue Tesla made a “bad bet” on cylindrical cells when the future was headed toward large-format prismatic solutions . If Tesla cannot rapidly bridge the gap, this view holds that the 4680 could become a costly detour – a technical “lock-in” to an inferior format.





Proponents’ Perspective (Strategic Vision): On the other hand, proponents contend that Tesla’s approach is strategically sound in the long run, even if the execution is behind schedule. They argue that Tesla is pushing battery innovation on multiple fronts – not just cell chemistry, but manufacturing integration – which could yield lasting competitive advantages. If Tesla solves the dry-coating scaling, it could patent and control a breakthrough production method that others lack, potentially undercutting all competitors on cost. The structural battery pack concept, pioneered by Tesla, is already being emulated (e.g. cell-to-chassis designs in China ). This suggests Tesla was directionally correct: integrating batteries into the vehicle structure is a key innovation, and Tesla moved first with 4680. Additionally, cylindrical cells have a proven reliability and performance track record; Tesla likely calculated that improving what it knows (cylinders) was safer than switching to pouch/prismatic which can have different failure modes (like swelling or delamination). There is also a supply-chain strategy: by making its own cells in the U.S., Tesla secures access to batteries without import issues and qualifies for local incentives, whereas relying purely on Chinese imports could be risky or limited by policy. Some independent engineers believe the 4680 will eventually meet its goals: “They will solve the issues, just maybe not on the original timeline,” one expert told Reuters . Indeed, Panasonic (a conservative Japanese firm) has validated the 4680 format by building pilot lines, indicating faith that it’s viable . Thus, supporters see the 4680 as a long-term play: short-term pain for eventual gain, with Tesla potentially leaping ahead when the kinks are fixed.





Middle Ground: It’s possible that both views hold some truth. Tesla’s 4680 is not fundamentally flawed in concept – it offers real benefits (structural simplification, high energy density potential, fewer parts) that even competitors acknowledge. However, Tesla underestimated the difficulty of the execution, especially the new manufacturing techniques and timeline. Elon Musk’s tendency to aggressively push targets (“two years” when it needed five, as Zeng noted ) likely exacerbated the perception of failure when deadlines slipped. In reality, Tesla may yet succeed with 4680s, but the timeframe might align more with the critics’ expectations (e.g. fully sorted out by 2025–2026, which is five years post-Battery Day). By then, however, Chinese firms will have advanced further (perhaps onto solid-state or other new formats), so Tesla risks always playing catch-up. Time-to-market is critical in tech, and here the Chinese have seized the initiative while Tesla refines its labs.





When evaluating credible evidence of leadership in various metrics:


• Performance (Energy Density & Range): At the cell level, Tesla’s 4680 (NCM) can pack more energy than a BYD Blade (LFP), but CATL’s latest NMC packs equal or exceed Tesla’s pack-level energy density . Additionally, Chinese automakers have produced 1000+ km range EVs using CATL batteries , an achievement Tesla hasn’t showcased yet. It’s arguable that on pure energy storage, Tesla is not significantly ahead; Chinese batteries are at least on par for high-end chemistries, and ahead in integrating LFP for mass-market.


• Fast-Charging: Here, evidence strongly suggests Chinese developers are ahead. Multiple sources confirm Chinese EVs achieving ~10–15 minute fast charge with current tech , whereas Tesla’s best is ~25 minutes. Tesla hasn’t demonstrated a vehicle charging at 4–5C rates, while CATL and others have done so in real cars. This gap may persist until Tesla adopts higher-voltage architectures or new chemistries – moves Chinese OEMs have already made.


• Cost-Efficiency: Chinese batteries have a cost edge at present, especially LFP. BYD’s €10/kWh cost advantage over Tesla’s 4680 is documented , and CATL’s sheer scale means it enjoys economies Tesla cannot yet match. Tesla’s hope is to catch up via manufacturing breakthroughs, but until those are realized, the evidence tilts toward Chinese superiority in cost efficiency (one reason Tesla keeps sourcing batteries from CATL and BYD for its cars in China and Europe).





Given these points, many industry insiders maintain that Tesla must show tangible 4680 progress soon to justify its investment. Otherwise, it might be wiser for Tesla to also embrace some of the Chinese approaches (e.g. use more LFP, consider prismatic for certain models, etc.) while reserving 4680 for niche uses. Notably, recent rumors suggest Tesla is considering CATL’s M3P (LFP+Mn) batteries for some Model Y in China – a sign that pragmatism can trump ideology when needed.





Conclusion





Is Tesla’s 4680 format a flawed dead-end or a sound strategy? The answer appears to be somewhere in between. The 4680 cell itself is not a fundamentally bad idea – it brings clear benefits in theory (high energy, structural pack integration, lower assembly costs) and aligns with Tesla’s history of leveraging cylindrical cells’ stability and scalability. However, Tesla’s execution missteps and timing have made the 4680 a case study in how even a tech leader can stumble in battery innovation. By choosing a very aggressive path (new form factor and new manufacturing methods and new integration all at once), Tesla indeed fell behind the curve set by Chinese battery giants who focused on more incremental, immediately scalable improvements.





There is credible evidence that Chinese battery developers currently lead in several critical aspects: they manufacture batteries more cheaply, have deployed higher-performing fast-charge technology, and scaled production to levels Tesla is still chasing. As CATL’s Zeng bluntly put it, a large cylindrical cell like the 4680 faces scaling issues that prismatic cells bypass – and so far, Tesla hasn’t fully proven him wrong . Tesla’s optimistic promises have yet to materialize, lending weight to the criticism of “overpromising and underdelivering.”





That said, writing off the 4680 as a failure would be premature. Tesla’s engineering resources are formidable, and they have shown a willingness to adapt (e.g. tweaking electrode designs, hiring experts to fix problems ). If Tesla can achieve the breakthrough it seeks – say, making dry-coated cells at high yield, or perhaps introducing a new 4680 chemistry with faster charge capability – it could leapfrog current batteries in cost or performance. The strategic soundness of the 4680 bet will ultimately be judged by where Tesla stands in a few years. If by 2025–2026 Tesla is mass-producing affordable 4680-powered cars with superior specs, then Musk’s risky approach will be vindicated. If not, Tesla may quietly pivot to the solutions its rivals pioneered.





In conclusion, the Tesla 4680 represents a high-risk, high-reward strategy. Chinese battery technology is not inherently “ahead” or “behind” in all dimensions – it reflects a different philosophy: rapid implementation of known good technologies versus Tesla’s moonshot innovation. Elon Musk’s approach to battery innovation is under intense scrutiny, and voices from China have offered pointed (and perhaps self-serving) critiques. The evidence so far leans toward Chinese makers having the upper hand in practical, scalable battery advances as of 2025 . However, Tesla’s story is still unfolding. The 4680 is down, but not necessarily out. How Tesla addresses its battery challenges in the next 1–2 years will determine if the 4680 was a visionary triumph in the making – or a cautionary tale of chasing an “aberration” while the competition raced ahead.





Sources: Tesla and industry reports; Reuters interviews with battery experts ; Electrek and InsideEVs coverage ; teardown study in Cell Reports Phys. Science (Fraunhofer/MEET/RWTH) ; statements by CATL’s CEO Robin Zeng ; Chinese EV news (CnEVPost, CarNewsChina) on CATL and BYD advances ; and other expert analyses as cited throughout.

 

[REM]

not my statement. I cited Chinese experts there’s a specific gentleman who said what I paraphrased right after battery day it was reported widely I’m not gonna do research right now. If you don’t want to answer that’s fine, but I’m not going to qualify statements that aren’t my own. Like I said I’ve run it through chat I’ll ask chat to find the exact quote and who said it but it’s out there.

I would kind of expect you to be aware of the criticisms that have been levied given your interest in the area which is really the only reason I posed the question to you.

Let me know when you find it then. I assume you agree with their assessment?

 

[dalton108]

Let me know when you find it then. I assume you agree with their assessment?

I do not. I edited the post above and posted the language from chat with no edits or modifications. I can post it again if you think that’s helpful.

 

[dalton108]

For full context my prompt was literally copying this whole entire comment including your statement and outlaws along with my response in full with the following addition.

“I am now asking you to do what I’ve stated in the last sentence. Don’t ask me any clarifying questions just do the research please.”

So at no point did I ask it hey I need this citation it just did that as part of the research and you have it below.

======================================================


Tesla’s 4680 Battery vs Chinese Innovations – Strategic Analysis





Figure: Tesla’s 4680 structural battery pack (left, with 830 large cylindrical cells) vs. BYD’s Blade battery pack (right, with many thin prismatic cells). Both designs eliminate traditional modules for improved integration.





Introduction





Tesla’s 4680 cylindrical battery cell (46 mm diameter, 80 mm height) represents a bold departure from prior EV battery formats. Unveiled at Tesla’s 2020 Battery Day, the 4680 was touted as a game-changer, promising five times the energy of smaller cells and major cost reductions through innovations like a tabless design and new manufacturing processes . However, in 2024 Chinese battery experts – including CATL’s founder Dr. Robin Zeng – openly criticized the 4680 approach, calling it a “bad bet” by Elon Musk . This report provides an expert-level analysis of Tesla’s 4680 cell format and its development trajectory, examining whether it is fundamentally flawed or strategically sound. We compare Tesla’s battery innovation (design, manufacturing, and charging performance) against leading Chinese technologies like CATL’s prismatic cell systems and ultra-fast charging solutions. We incorporate verifiable commentary from battery engineers and industry insiders on both sides of the debate, and evaluate if Chinese developers are credibly ahead of Tesla in performance, cost-efficiency, or fast-charging capabilities.





Tesla’s 4680 Cell – Design and Ambitions





Cell Format & Design: The Tesla 4680 is a large cylindrical Li-ion cell employing a novel “tabless” electrode design. By eliminating the traditional tab connectors, Tesla distributes current flow more evenly across the electrode sheet, reducing internal resistance and heat generation . The cell uses a high-nickel NCM811 cathode (nickel-cobalt-manganese) to maximize energy density, paired with a graphite-based anode (with silicon additives) for high capacity . According to a 2023 teardown study by independent German researchers (Fraunhofer IKTS and partners), Tesla’s 4680 cell achieved ~241 Wh/kg gravimetric energy density (≈643 Wh/L volumetric) – significantly higher than typical LFP cells – aligning with Tesla’s focus on range and performance. The large-format cylinder holds about 5× the volume of Tesla’s older 2170 cells, enabling fewer cells per pack for a given energy. Crucially, Tesla integrates 4680 cells into a structural battery pack (cells directly bonded into the vehicle chassis), eliminating modules and using the pack itself as part of the car’s structure for weight savings and simplified assembly .





Manufacturing Innovations: Tesla’s approach to 4680 production is as radical as the cell design. The company introduced a new dry-coating process for electrode fabrication (acquired via Maxwell Technologies) instead of the conventional wet slurry method . This dry process skips the solvent and lengthy drying steps, potentially cutting manufacturing cost and time dramatically. In theory, the 4680’s simpler pack (with 830 cells instead of ~4,400 in a Model Y pack) and tabless design also streamline production – weld points are slashed from 17,600 to about 1,660, reducing complexity . Tesla claimed that these innovations could halve the cost per kWh of the pack (an estimated $5,500 savings on a Model Y battery) , paving the way for a $25k affordable EV in the future . The 4680 cells are produced in-house (at Giga Texas and pilot lines), part of Tesla’s strategy to vertically integrate battery supply and secure a huge scale (targeting 500 GWh/yr production by 2030) .





Performance Targets: The 4680 format was envisioned to boost vehicle range and power. A larger cell with lower internal resistance can deliver high current, and Tesla intended the tabless 4680 to support faster Supercharging with less heat build-up. In practice, current Tesla vehicles (400 V architecture) charge at peak rates around 250–270 kW (~3C for a ~80 kWh pack), achieving 10–80% recharge in ~25 minutes. Elon Musk has hinted that 4680 packs will eventually enable faster charging and better energy density than any competitor. In late 2024, Tesla even stated that its 4680 cell would attain the industry’s lowest cost per kWh by year-end . These claims underscore Tesla’s confidence in the strategic value of the 4680 project – if executed successfully, it could secure a lead in battery cost-performance and reduce reliance on Asian suppliers.





Development Trajectory and Challenges





Ramp-up Difficulties: Despite its promise, the 4680 program has faced significant engineering and scaling challenges. Reports from mid-2022 onward indicate Tesla struggled to transition the dry electrode coating from lab to mass production. Reuters interviews with a dozen battery experts revealed that Tesla was “only halfway there” on its Battery Day goals by 2022, primarily because the dry-coating technique was causing low yields at volume . One expert noted Tesla could make 4680 cells in small batches, “but when they started big volume production, … ended up with many rejects, too many.” . By late 2022, Tesla had not met its timeline for volume production and had to delay the full rollout. Early 4680 cells used in a Texas-built Model Y (Standard Range) had lower-than-expected energy content and charging speed, suggesting Tesla took a conservative approach initially to optimize yields and pack integration. Manufacturing bottlenecks – especially with the dry electrode process – persisted into 2023, leading Tesla to poach outside experts to help solve the issues .





Performance Gaps: Initial 4680-based Model Y vehicles disappointed some expectations. Analyses showed the standard-range Model Y with 4680 cells achieved similar range to older long-range versions despite a structural pack (implying the 4680 cells at that point had no clear energy density advantage yet) . Charging curves observed by early owners indicated that the 4680 pack was no faster – and in some cases slower – to charge than Tesla’s 2170 packs, likely due to cautious software limits as Tesla refined thermal management. An industry teardown found the 4680 cell generates ~2.3× more heat per volume at 1C discharge compared to BYD’s Blade LFP cell , a consequence of its high energy, high-resistance chemistry, which demands very robust cooling. These early data points fueled skepticism that the 4680 was underdelivering on its revolutionary promises.





Tesla’s Progress: Tesla has made incremental improvements and still vigorously defends the 4680 strategy. By late 2023, Tesla announced it had produced its 100 millionth 4680 cell and was ramping production for the Cybertruck, which uses a 4680-based pack. Executives reported improved yields and throughput, claiming the cost per cell was steadily dropping and would beat outsourced cells within months . Indeed, even without full dry-coating success, Tesla reaped some benefits: using larger cells and structural packs already cut costs and simplified assembly. Experts note that going from 4,400 small cells per pack to 830 large cells (as Tesla did) is itself a big manufacturing win (fewer cells to handle and weld) . So far, however, these gains appear to be offset by the complexity of the new processes. One engineer summarized that “most of the [4680] advantages right now come from the bigger cell format,” while the novel dry process has yet to pay off . In short, Tesla’s development trajectory has been slower and more difficult than anticipated, but not necessarily a dead end – the company is investing heavily to fix the issues and still plans to make the 4680 the cornerstone of its future battery supply.





Criticisms from Chinese Battery Experts





Tesla’s challenges have not gone unnoticed by competitors, especially in China – the world’s EV battery powerhouse. In mid-2024, Dr. Robin Zeng, founder and chairman of CATL (Contemporary Amperex Technology Co. – the globe’s largest EV battery maker), made waves with unusually candid criticism of Tesla’s 4680 strategy. Zeng revealed that during Elon Musk’s visit to China, he told Musk directly that the bet on the 4680 cylindrical cell “is going to fail and never be successful.” This blunt statement from an industry leader underscores a viewpoint held by many Chinese battery engineers: that larger cylindrical cells are a fundamentally flawed path for EVs.





Zeng’s critique is rooted in both business and technical reasoning. He argued that Elon Musk “doesn’t know how to make a battery. It’s about electrochemistry,” suggesting that Tesla underestimated the chemistry challenges in scaling up the 4680 . In a heated debate with Musk, Zeng reportedly “showed him” why the 4680 approach was problematic, after which “[Musk] was silent.” Zeng pointed out that Musk habitually overpromises timelines, pushing 2-year targets for technologies that realistically need 5+ years – a management style that may have driven Tesla to attempt too much too quickly with the 4680. His core technical critique centers on the cell format: According to Zeng (who holds a PhD in physics and built CATL’s empire on prismatic cell tech), the cylindrical 4680 is intrinsically harder to scale and less optimal than prismatic cells. “We had a very big debate, and I showed him… He doesn’t know how to make a battery,” Zeng recounted .





Independent observers note that Zeng “is not an unbiased observer” – CATL is Tesla’s supplier and also a competitor (Tesla’s 4680 in-house efforts aim to reduce reliance on CATL). Nonetheless, Zeng’s technical arguments carry weight given CATL’s success. One engineer explained that large cylindrical cells face inherent longevity issues: as they charge/discharge, the jellyroll of electrodes swells against the rigid can, causing mechanical stress and micro-cracks over many cycles . Prismatic cells, by contrast, can accommodate swelling with less internal damage (their flat layers can expand slightly into any free volume). Over time, the stress in cylinders can lead to particle break-off, internal shorting, and faster capacity loss . This suggests that maintaining long cycle life in a big cylinder like 4680 may be harder without perfecting the chemistry and mechanical design (e.g. precise pre-loading of the jellyroll).





Other Chinese experts echo the sentiment that Tesla’s path is an “aberration” compared to the mainstream. The vast majority of new EVs in China (and indeed globally, outside Tesla) use either prismatic or pouch cells, not cylindrical. Even Tesla itself relies on CATL’s prismatic LFP cells for its standard-range models. From CATL’s perspective, most automakers prefer prismatic cells for their easier packaging and cooling at large sizes . Both CATL and BYD (China’s #2 battery firm) have achieved massive scale with prismatics, leading Zeng to call 4680 a “dead-end” that “won’t scale” to meet mass-market needs . In his view, Tesla’s insistence on cylindrical cells is a strategic misstep – one that ties up Tesla’s resources while Chinese companies forge ahead with proven, cost-effective technologies.





It’s important to note that not all analysts agree that 4680 is doomed. Some industry insiders defend Tesla’s approach, arguing that cylindrical cells have well-known advantages in manufacturability and reliability. For example, Panasonic and LG (major cell producers) have both invested in developing 4680-format cells for Tesla , suggesting confidence that the format can work if kinks are ironed out. Additionally, companies like BMW have announced adoption of large cylindrical cells (similar ~46mm diameter) for their next-gen EVs, contracting CATL and EVE Energy to supply them – an ironic twist, as Chinese firms themselves will produce cylindrical cells to meet Western OEM demand. These moves indicate that some engineers see merit in the 4680 approach’s potential for high energy and structural efficiency, even if CATL’s CEO publicly disparages it. Nonetheless, the criticisms from China highlight real challenges Tesla must overcome and underscore that time is of the essence – Chinese battery tech is advancing rapidly while Tesla perfects the 4680.





Chinese Battery Innovations: Prismatic Cells & Ultra-Fast Charging





While Tesla labored on the 4680, Chinese battery developers surged ahead on multiple fronts: cell chemistry, form-factor integration, and charging speeds. Two leading approaches in China are exemplified by CATL’s third-generation cell-to-pack (“Qilin”) batteries and BYD’s Blade battery. Both use prismatic cell formats (as opposed to cylindrical) and have been optimized for different priorities (energy density and fast charging for CATL; safety and cost-efficiency for BYD). In parallel, Chinese EV makers and battery firms have aggressively pursued ultra-fast charging solutions, leveraging high C-rate batteries and high-voltage architectures (800–900V systems) to slash charging times. Below we examine these innovations in detail.





CATL’s Cell-to-Pack (CTP) “Qilin” Battery





Design and Integration: CATL’s Qilin battery (CTP 3.0) is a prismatic-cell pack system launched in 2022–2023, representing the pinnacle of CATL’s pack integration tech. Qilin uses large prismatic NMC cells (or LFP for standard versions) directly integrated into the pack without modules – analogous to Tesla’s structural approach, but retaining a flat prism form factor. CATL achieved a record 72% volume utilization in the Qilin pack by tightly packing cells and embedding coolant interfaces between cells . (For comparison, Tesla’s 4680 structural pack is estimated to use ~63% of pack volume for cells ). This high integration yields exceptional energy density: up to 255 Wh/kg at the pack level for the NMC version – enough for 1000 km range in a large sedan under China’s testing. CATL themselves claim the Qilin pack offers “13% more power” output and better thermal performance than an equivalent 4680-based pack . The pack design spreads coolant across the cell surfaces, enabling uniform temperature control and safer operation under high loads.





Fast-Charging and Performance: One of Qilin’s hallmark features is fast-charge capability. Thanks to advanced cooling and cell design, Qilin-equipped vehicles have demonstrated remarkable charging speeds. For instance, a 102 kWh Qilin battery in a Li Auto MPV was shown charging 10% to 80% in just ~10.6 minutes – reaching charging power well above 400 kW (5C+ rates). CATL also introduced the “Shenxing” LFP cell (4C fast charging) as part of this family, which can add ~400 km range in 10 minutes . Real-world models like the Zeekr 001 (2024 update) use a 100 kWh CATL pack that charges 10–80% in ~11.5 minutes , making it one of the fastest-charging EVs on the market. To further push boundaries, CATL and SAIC recently announced a 6C fast-charging LFP pack for GM’s Ultium platform (900V) that can take ~200 km in 5 minutes (i.e. potentially full charge ~10 min) . These achievements highlight that Chinese firms are prioritizing charging speed as a competitive differentiator – leveraging high-power cell chemistry and high-voltage (800–900V) systems to dramatically cut charge times. Tesla, by contrast, has stuck with ~400V architecture and more moderate charging rates to date.





Chemistry and Cost: The CATL Qilin uses high-nickel chemistries for maximum energy in premium models, but CATL also offers an LFP version (~160 Wh/kg) for lower cost and long cycle life . CATL has unparalleled scale in both NMC and LFP production, giving it cost advantages. By late 2020s, CATL’s manufacturing expertise and China’s supply chain allowed it to achieve lower cell $/kWh costs than most. (Tesla’s own CFO acknowledged CATL’s LFP cells were the “cheapest form of energy storage” for standard-range cars in 2021.) The Qilin’s cell-to-pack approach further cuts cost by eliminating module components and simplifying assembly – similar in principle to Tesla’s structural pack cost savings. In fact, Tesla has partnered with CATL to use CATL’s pack technology at Giga Shanghai, and even licensed some manufacturing know-how for its U.S. factories . This underscores that CATL’s approach is considered highly effective, even by Tesla, when adapted to LFP chemistry for affordability.





BYD’s Blade Battery





Design and Safety: BYD’s Blade battery is a distinctive prismatic LFP battery launched in 2020 that emphasizes safety and cost. The “Blade” refers to the cell shape: an extremely long, thin prismatic cell (≈965 mm length, 90 mm height, 14 mm thick). These blade-like cells are arrayed in a pack without modules, providing structural support and a very high packing efficiency. The LFP chemistry (LiFePO₄) inherently offers high thermal stability – BYD famously demonstrated driving a nail through a Blade cell without it catching fire, a testament to its safety margin against thermal runaway. The Blade’s design helps dissipate heat and prevents propagation of fire if one cell did fail. BYD prioritized safety and longevity over absolute energy density: the Blade cell has about 160 Wh/kg energy density (roughly 30-40% less than high-nickel cells) , but it excels in durability (reportedly capable of 3000+ charge cycles) and is much cheaper due to the lack of nickel/cobalt .





Cost Efficiency: A teardown study in 2023 compared the Blade vs Tesla’s 4680 and found BYD’s material cost per kWh is around €10 lower than Tesla’s 4680 cell . This aligns with expectations: LFP materials are cheaper, and BYD’s massive scale and vertical integration (they produce everything from cathode powder to pack in-house) drive costs down. BYD uses simpler, established manufacturing techniques (coating, stacking) and avoids bleeding-edge processes that can cause yield problems. The result is a battery that is highly cost-competitive. In fact, BYD’s ability to sell EVs at lower price points with Blade batteries has helped it surpass Tesla in global EV sales (including hybrids) in recent years – a market validation of its strategy focusing on affordability and reliability. The Blade’s success has pushed many Chinese automakers to adopt LFP for mass-market models, even as Tesla also shifted its Standard Range cars to LFP packs from CATL.





Performance Trade-offs: The Blade’s LFP chemistry means lower energy density and a lower nominal voltage than NMC cells, which typically translates to slightly shorter range and slower charging for a given pack size. BYD’s current Blade-based EVs usually charge 10–80% in ~25–30 minutes – decent (thanks to cell-to-pack design reducing resistance), but not record-setting. However, BYD is not standing still on innovation. Reports indicate BYD is developing a “Blade 2.0” with higher energy and faster charging, potentially incorporating manganese doping or other tweaks to allow 6C charging like CATL’s plans . This new Blade 2.0, expected in 2024–25, aims to narrow the performance gap while retaining LFP’s cost and safety advantages. Also, BYD is exploring cell-to-chassis integration (embedding the Blade pack as part of the vehicle frame) in some luxury models, similar to Tesla’s structural concept, which could further improve weight and space efficiency. In summary, BYD’s Blade exemplifies the Chinese focus on pragmatic innovation – using robust chemistry and clever packaging to deliver a battery that is very safe and cheap, and gradually improving its performance.





Ultra-Fast Charging Race





Chinese companies are racing ahead in fast-charging technology, often outpacing Tesla in this area. The combination of high-C-rate battery cells and adoption of 800V+ vehicle architectures has led to multiple production EVs in China achieving <15 minute fast-charge times:


• CATL “Shenxing” 4C LFP Battery: Introduced in 2023, Shenxing is the world’s first LFP battery rated for 4C charge. It can add 400 km (250 miles) of range in 10 minutes of charging . First deployments (e.g. Changan Avatr 12 EV) are in early 2024, with promised 0–80% charge in about 15 minutes even in cold weather. This brings LFP, traditionally a slower-charging chemistry, into parity with or beyond NMC cells on charge speed.


• 5C and 6C Pack Introductions: The 2024 Zeekr 001 premium sedan uses a CATL 5C-capable pack (NMC chemistry) that charges 10–80% in 11.5 minutes . The Li Auto “Mega” MPV (2024) uses a 5C Qilin pack enabling 500 km added in 12 minutes . Building on this, CATL and SAIC-GM announced a 6C ultra-fast LFP battery (co-developed for GM’s Ultium platform) that can accept a full charge in ~10 minutes on a 900V system . This 6C battery – slated for 2024 release – is likely the second-gen Qilin or a new “Qilin 2.0” pack . BYD is similarly working on a 6C Blade 2.0. These advancements mean we will soon see EVs that charge nearly as fast as refueling an ICE vehicle – a ~10 minute full recharge.


• Charging Infrastructure: To leverage these batteries, Chinese companies are also deploying higher-powered chargers. Huawei unveiled a 600 kW DC fast charger in early 2023 (capable of ~4C on a 150 kWh pack) . State grids in China are upgrading freeway charging stations to 480 kW and above to support new 4C/5C EVs . In contrast, Tesla’s Supercharger V3 network is 250 kW (and the upcoming V4 is ~350 kW), which is sufficient for Tesla’s current ~3C charging needs but would be a bottleneck for 5-6C batteries. Thus, China is not only ahead in battery capability but also building the ecosystem to use it. This could give Chinese EV brands a perceived advantage (“charge in 10 minutes”) in the eyes of consumers.





In summary, Chinese battery developers (CATL, BYD, and others like CALB, GAC, Svolt) have been rapidly iterating on prismatic cell technology, pack integration, and charging speeds. They have focused on incremental but high-impact improvements – e.g. eliminating module waste, improving cooling, utilizing safer chemistries at scale, and embracing higher voltage systems – rather than attempting radically new manufacturing methods that might delay deployment. The result by 2025 is that Chinese companies lead in areas like cost per kWh and fast-charge performance, and they dominate global battery production volume. These developments form the backdrop for assessing Tesla’s 4680: is Tesla leaping ahead or falling behind?





Comparative Analysis: Tesla 4680 vs Leading Chinese Alternatives





To crystallize the differences, the table below compares key attributes of Tesla’s 4680 cylindrical cell approach with two leading Chinese battery solutions: CATL’s Qilin (prismatic NMC) for high performance and BYD’s Blade (prismatic LFP) for cost/safety. This highlights the trade-offs in format, chemistry, performance, and strategic positioning:

Aspect	Tesla 4680 (Cylindrical NCM)	CATL Qilin (Prismatic NMC)	BYD Blade (Prismatic LFP)
Cell Format & Design	Large cylindrical cell (46×80 mm) with tabless jelly-roll electrodes in a steel can. Used as a structural element in pack (cell bonding contributes to chassis stiffness) .	Large prismatic cells in a cell-to-pack architecture (no modules). Pack design optimized with ~72% volume utilization . Flat cells allow broad contact with cooling plates.	Long, thin prismatic (Blade) cells (~965×90×14 mm) inserted cross-wise in pack (also module-free). Pack provides structural support, though some models exploring full cell-to-chassis integration.
Chemistry	High-nickel NCM811 cathode, graphite/silicon anode. Aims for high energy and adequate power. (Tesla also uses NCA in other cells; 4680 likely similar performance)	High-nickel NMC cathode (for high-end versions; LFP option also available). Also experimenting with Mn-rich cathodes. Emphasis on versatile chemistry support in same form-factor.	LFP (LiFePO₄) cathode, graphite anode. Prioritizes stability and longevity over max energy. Low raw material cost (iron/phosphate, no Ni/Co). Future Blade 2.0 may add manganese to boost energy & voltage.
Energy Density	~241 Wh/kg (cell level) ; ~<200 Wh/kg at pack level initially (due to structural adhesives, etc.). Tesla claims potential >300 Wh/kg with future improvements.	Up to 255 Wh/kg (pack level) for NMC version – highest of current mass-produced packs. Achieved via high % of active material in pack. LFP version ~160 Wh/kg .	~160 Wh/kg (cell) ; ~140 Wh/kg pack. Energy density is lower, requiring larger pack for same range. BYD offsets this somewhat with very efficient motors and aero in vehicles.
Fast-Charging	Currently ~3C peak (e.g. Model Y 4680 ~250 kW on ~75 kWh pack). 10–80% typically ~25 min. Tabless design intended to reduce heat and allow higher C, but high-nickel chem limits extreme fast charge. Improvements expected, but no 4680 car yet beats 20-min 10–80% mark.	Up to 4–5C in today’s 3rd-gen packs (e.g. 10–80% in ~10–15 min) . Demonstrated 5C charging in production EVs (Zeekr, Li Auto). Next-gen 6C (~10 min full charge) slated by end of 2024 . Often uses 800–900V architecture to enable >350 kW charging.	~2–3C in current Blade packs (BYD Han EV charges ~30–40% in 10 min, ~60% in 20 min). Adequate for most users but slower than top NMC packs. However, Blade 2.0 aims for ~6C fast charge , which would bring LFP on par with the fastest.
Cycle Life & Degradation	Projected ~1,000 cycles to ~80% capacity (typical for NMC at high utilization). Uses advanced BMS to limit degradation (e.g. not charging to 100% daily). Tabless design may reduce localized stress, but large format could see higher strain per cycle (to be proven).	~1,000 cycles for NMC version (typical), potentially more if operated at partial SOC. Strong cooling and lower depth-of-discharge per cell (due to large pack sizes) can extend life. LFP Qilin can exceed 3,000 cycles easily. Overall good longevity expected, similar to other high-end packs.	2,000+ cycles to 80% is common (LFP inherently has excellent cycle life). BYD taxis with Blade batteries reportedly see minimal degradation after 200k+ km. Very resistant to thermal runaway and thus can endure abuse (fast charge, high temp) more safely, though extreme charging still shortens life.
Safety	Uses inert internal chemistry (but high Ni cathodes can be more reactive than LFP if abused). Strong steel can containment. Tesla’s pack design and software aggressively manage temps to prevent thermal issues. Track record of cylindrical cells is robust, but a cell thermal failure could generate significant heat due to larger cell size.	NMC chemistry is more volatile than LFP, but CATL’s design emphasizes cooling and isolation. Qilin pack has thermal buffer materials and rapid cooling to prevent propagation. CATL claims significantly improved thermal stability vs earlier packs . Several Chinese EVs with Qilin packs have scored well in safety tests.	LFP chemistry is intrinsically safer (stable crystal structure). Blade form factor further reduces risk – even in nail penetration tests, it did not ignite. BYD’s Blade packs have shown extreme abuse tolerance (fire, crushing) in demos. Overall among the safest EV batteries available, a key selling point.
Manufacturing & Scale	In-House Tesla production, but still ramping. Complex new processes (dry coating, laser tabless welding) caused low yields . By 2024, limited volumes (used in Model Y and new Cybertruck). Tesla aiming for mass scale, but currently still supplementing with supplier cells.	Mass production underway. CATL, the world’s #1 cell maker (~<40% global market share), is producing Qilin for multiple brands (e.g. Zeekr 009, 001, Li Auto) . Proven manufacturing (uses modified conventional processes). CATL can scale output rapidly given its enormous factories and resources.	Mass production since 2020. BYD manufactures Blade batteries for all its EVs (and supplies Toyota and others). BYD was the #2 global EV battery producer in 2023. Manufacturing is relatively straightforward (prismatic stacking + welding) with very high yield; BYD’s vertical integration gives tight quality control.
Cost per kWh	Aiming for high cost reduction (~$50–60/kWh cell cost target long-term). Currently likely higher than prismatic LFP cost due to lower yields and expensive metals. Tesla’s hope is that once perfected, 4680 will be cheapest for its class (high energy cells). Until then, Tesla even buys cheaper LFP packs from CATL for its lower-end models.	Competitive cost for a high-performance battery. CATL’s scale and manufacturing efficiency yield low $/kWh even for NMC. Still, NMC materials cost more than LFP. CATL offset this with pack-level simplification (CTP). For large orders (Tesla, etc.), CATL can offer very aggressive pricing due to economies of scale and domestic supply chain advantages.	Low cost leader. LFP material cost is ~30% lower than NMC, and Blade’s simplified design further cuts cost. The Fraunhofer teardown found Blade’s material cost per kWh was ~€10 lower than Tesla 4680’s . BYD’s huge volume and in-house cathode production drive costs down. This makes Blade batteries extremely attractive for mass-market EVs where price is key.

Table: Comparison of Tesla’s 4680 cylindrical cell approach vs CATL’s Qilin cell-to-pack and BYD’s Blade battery. Data compiled from teardown studies and manufacturer claims.





Expert Commentary: Flawed Bet or Strategic Vision?





The above analysis reveals stark contrasts between Tesla’s battery strategy and its Chinese counterparts. So, is Tesla’s 4680 trajectory fundamentally flawed or strategically sound? The answer may be nuanced.





Critics’ Perspective (Flawed Bet): Many experts, like CATL’s Zeng, view the 4680 as an over-ambitious gamble that distracted Tesla from readily available solutions. From this perspective, Tesla tried to “reinvent the wheel” in a highly optimized industry and hit foreseeable roadblocks. Chinese insiders point out that Tesla is years behind on adopting manufacturing refinements that already yield great results – e.g. CATL achieved similar or better pack performance with Qilin without exotic new processes. The fact that Tesla still relies on CATL and Panasonic cells for most of its production is telling; it suggests 4680 hasn’t delivered the step-change needed to outcompete the incumbents. Furthermore, the rise of BYD and CATL – who are now not just suppliers but rivals in EV sales and technology – indicates that Tesla may be ceding its early battery lead. In fast-charging, for example, Chinese EVs charging in 10–15 minutes make Tesla’s ~25 minute charge seem laggard. And on cost, Tesla’s hoped-for savings haven’t materialized yet, whereas Chinese battery costs keep dropping. In short, critics argue Tesla made a “bad bet” on cylindrical cells when the future was headed toward large-format prismatic solutions . If Tesla cannot rapidly bridge the gap, this view holds that the 4680 could become a costly detour – a technical “lock-in” to an inferior format.





Proponents’ Perspective (Strategic Vision): On the other hand, proponents contend that Tesla’s approach is strategically sound in the long run, even if the execution is behind schedule. They argue that Tesla is pushing battery innovation on multiple fronts – not just cell chemistry, but manufacturing integration – which could yield lasting competitive advantages. If Tesla solves the dry-coating scaling, it could patent and control a breakthrough production method that others lack, potentially undercutting all competitors on cost. The structural battery pack concept, pioneered by Tesla, is already being emulated (e.g. cell-to-chassis designs in China ). This suggests Tesla was directionally correct: integrating batteries into the vehicle structure is a key innovation, and Tesla moved first with 4680. Additionally, cylindrical cells have a proven reliability and performance track record; Tesla likely calculated that improving what it knows (cylinders) was safer than switching to pouch/prismatic which can have different failure modes (like swelling or delamination). There is also a supply-chain strategy: by making its own cells in the U.S., Tesla secures access to batteries without import issues and qualifies for local incentives, whereas relying purely on Chinese imports could be risky or limited by policy. Some independent engineers believe the 4680 will eventually meet its goals: “They will solve the issues, just maybe not on the original timeline,” one expert told Reuters . Indeed, Panasonic (a conservative Japanese firm) has validated the 4680 format by building pilot lines, indicating faith that it’s viable . Thus, supporters see the 4680 as a long-term play: short-term pain for eventual gain, with Tesla potentially leaping ahead when the kinks are fixed.





Middle Ground: It’s possible that both views hold some truth. Tesla’s 4680 is not fundamentally flawed in concept – it offers real benefits (structural simplification, high energy density potential, fewer parts) that even competitors acknowledge. However, Tesla underestimated the difficulty of the execution, especially the new manufacturing techniques and timeline. Elon Musk’s tendency to aggressively push targets (“two years” when it needed five, as Zeng noted ) likely exacerbated the perception of failure when deadlines slipped. In reality, Tesla may yet succeed with 4680s, but the timeframe might align more with the critics’ expectations (e.g. fully sorted out by 2025–2026, which is five years post-Battery Day). By then, however, Chinese firms will have advanced further (perhaps onto solid-state or other new formats), so Tesla risks always playing catch-up. Time-to-market is critical in tech, and here the Chinese have seized the initiative while Tesla refines its labs.





When evaluating credible evidence of leadership in various metrics:


• Performance (Energy Density & Range): At the cell level, Tesla’s 4680 (NCM) can pack more energy than a BYD Blade (LFP), but CATL’s latest NMC packs equal or exceed Tesla’s pack-level energy density . Additionally, Chinese automakers have produced 1000+ km range EVs using CATL batteries , an achievement Tesla hasn’t showcased yet. It’s arguable that on pure energy storage, Tesla is not significantly ahead; Chinese batteries are at least on par for high-end chemistries, and ahead in integrating LFP for mass-market.


• Fast-Charging: Here, evidence strongly suggests Chinese developers are ahead. Multiple sources confirm Chinese EVs achieving ~10–15 minute fast charge with current tech , whereas Tesla’s best is ~25 minutes. Tesla hasn’t demonstrated a vehicle charging at 4–5C rates, while CATL and others have done so in real cars. This gap may persist until Tesla adopts higher-voltage architectures or new chemistries – moves Chinese OEMs have already made.


• Cost-Efficiency: Chinese batteries have a cost edge at present, especially LFP. BYD’s €10/kWh cost advantage over Tesla’s 4680 is documented , and CATL’s sheer scale means it enjoys economies Tesla cannot yet match. Tesla’s hope is to catch up via manufacturing breakthroughs, but until those are realized, the evidence tilts toward Chinese superiority in cost efficiency (one reason Tesla keeps sourcing batteries from CATL and BYD for its cars in China and Europe).





Given these points, many industry insiders maintain that Tesla must show tangible 4680 progress soon to justify its investment. Otherwise, it might be wiser for Tesla to also embrace some of the Chinese approaches (e.g. use more LFP, consider prismatic for certain models, etc.) while reserving 4680 for niche uses. Notably, recent rumors suggest Tesla is considering CATL’s M3P (LFP+Mn) batteries for some Model Y in China – a sign that pragmatism can trump ideology when needed.





Conclusion





Is Tesla’s 4680 format a flawed dead-end or a sound strategy? The answer appears to be somewhere in between. The 4680 cell itself is not a fundamentally bad idea – it brings clear benefits in theory (high energy, structural pack integration, lower assembly costs) and aligns with Tesla’s history of leveraging cylindrical cells’ stability and scalability. However, Tesla’s execution missteps and timing have made the 4680 a case study in how even a tech leader can stumble in battery innovation. By choosing a very aggressive path (new form factor and new manufacturing methods and new integration all at once), Tesla indeed fell behind the curve set by Chinese battery giants who focused on more incremental, immediately scalable improvements.





There is credible evidence that Chinese battery developers currently lead in several critical aspects: they manufacture batteries more cheaply, have deployed higher-performing fast-charge technology, and scaled production to levels Tesla is still chasing. As CATL’s Zeng bluntly put it, a large cylindrical cell like the 4680 faces scaling issues that prismatic cells bypass – and so far, Tesla hasn’t fully proven him wrong . Tesla’s optimistic promises have yet to materialize, lending weight to the criticism of “overpromising and underdelivering.”





That said, writing off the 4680 as a failure would be premature. Tesla’s engineering resources are formidable, and they have shown a willingness to adapt (e.g. tweaking electrode designs, hiring experts to fix problems ). If Tesla can achieve the breakthrough it seeks – say, making dry-coated cells at high yield, or perhaps introducing a new 4680 chemistry with faster charge capability – it could leapfrog current batteries in cost or performance. The strategic soundness of the 4680 bet will ultimately be judged by where Tesla stands in a few years. If by 2025–2026 Tesla is mass-producing affordable 4680-powered cars with superior specs, then Musk’s risky approach will be vindicated. If not, Tesla may quietly pivot to the solutions its rivals pioneered.





In conclusion, the Tesla 4680 represents a high-risk, high-reward strategy. Chinese battery technology is not inherently “ahead” or “behind” in all dimensions – it reflects a different philosophy: rapid implementation of known good technologies versus Tesla’s moonshot innovation. Elon Musk’s approach to battery innovation is under intense scrutiny, and voices from China have offered pointed (and perhaps self-serving) critiques. The evidence so far leans toward Chinese makers having the upper hand in practical, scalable battery advances as of 2025 . However, Tesla’s story is still unfolding. The 4680 is down, but not necessarily out. How Tesla addresses its battery challenges in the next 1–2 years will determine if the 4680 was a visionary triumph in the making – or a cautionary tale of chasing an “aberration” while the competition raced ahead.





Sources: Tesla and industry reports; Reuters interviews with battery experts ; Electrek and InsideEVs coverage ; teardown study in Cell Reports Phys. Science (Fraunhofer/MEET/RWTH) ; statements by CATL’s CEO Robin Zeng ; Chinese EV news (CnEVPost, CarNewsChina) on CATL and BYD advances ; and other expert analyses as cited throughout.

 

[OUTLAW]

So I’m still waiting where is the innovation in my 4680 battery pack since I bought my truck? where is all that efficiency improvement and density that supposedly increases mileage?

 

[VAF84]

not my statement. I cited Chinese experts there’s a specific gentleman who said what I paraphrased right after battery day it was reported widely I’m not gonna do research right now. If you don’t want to answer that’s fine, but I’m not going to qualify statements that aren’t my own. Like I said I’ve run it through chat I’ll ask chat to find the exact quote and who said it but it’s out there.

I would kind of expect you to be aware of the criticisms that have been levied given your interest in the area which is really the only reason I posed the question to you.

Like I said, I really don’t have a position and I’m definitely not looking for a fight.

======================================================

ChatGPT 4.5 deep research j....

Honestly, ChatGPT's answer is about what I expected. The answer is somewhere in the middle.

 

[dalton108]

Honestly, ChatGPT's answer is about what I expected. The answer is somewhere in the middle.

Yeah, if I knew anything about the topic I would be in a position to give further prompts to the chat; however, what I know from things that I am familiar with is that if there’s any sort of controversy chat bots are trained to avoid the controversy and present milquetoast split the difference answers that are often, but not always, technically correct in every way, but intentionally miss the point if necessary to avoid being controversial.

The reason that I asked @REM is because he has a definite viewpoint and I’m confident that he can fully articulate it. Just because ChatGPT says it’s kind of a tie doesn’t mean that that’s the case. I know this from experience when I know the answer and just asking to test it.

 

[Pulaski]

Anyway... How bout that range extender? I'd love to get my hands on one.

 

[REM]

The reason that I asked @REM is because he has a definite viewpoint and I’m confident that he can fully articulate it. Just because ChatGPT says it’s kind of a tie doesn’t mean that that’s the case. I know this from experience when I know the answer and just asking to test it.

The content that the LLM spit out is far too overwhelming to address every single point so I will hit the main ones (that interest me the most, lol):

1) Anyone who lives in China who dissents against the CCPs interest will quietly and quickly disappear, so we can go ahead and rule out any experts there who claim their tech is automatically superior. Sure, some of the packs over there are charging faster, but how long will they last? And is it coincidental that their packs are catching fire at a much higher rate per capita than over here? Tesla's safety goals outweigh charge speeds so I'm not concerned about that factor.

2) Both prismatic and cylindrical cells have their pros and cons, but I think we are trying to focus on a clear "large scale economic winner" in this discussion, so I will focus mainly on one thing that Elon repeats over and over again: the sheer amount of GWh manufacturing capacity per year.

Not a direct comparison, but take a look at prismatic vs cylindrical. Which one looks overall easier to ramp up to insane production speeds?

Chemistry can and will be improved for both formats, but the largest impact we have right now is how fast they can be assembled at acceptable yields.

Happy to continue discussing nuances.

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