Battery Degradation

[CBTK2463]

Curious what’s your battery degradation, I lost 3% in 10 month of driving it (15k miles). Post yours below.

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[eswimm]

1.4% in 6 months and 5400 miles. Degradation is usually highest in the first year, 3% is on the low end. It also tends to look a little worse in the cold weather, you may see it rebound a little once it warms back up.

The Cybertruck is also a new battery, I don't think we really know what to expect from degradation yet, since there's no guarantee it performs similarly to older designs.

 

[T-1000]

This is mine, with 8100 miles.

 

[CyberGus]

I front-loaded my early degradation by Supercharging exclusively in the first few months, but it’s leveled off.

 

[AlmostHuman]

 

[AlmostHuman]

2020 Model X for reference:

 

[mkstohler]

Good morning guys, How do you access the information stats that you are showing?

 

[REM]

2020 Model X for reference:

9% is quite high for 50K miles; I'd be weary of that number. I hope these apps are coming with huge disclaimers explaining how they estimate.

 

[CyberGus]

9% is quite high for 50K miles; I'd be weary of that number. I hope these apps are coming with huge disclaimers explaining how they estimate.

Tessie says they are displaying the info provided by the BMS.

 

[REM]

Tessie says they are displaying the info provided by the BMS.

Sure, but it probably doesn't tell the whole story. It's fine to estimate, but people need to know those aren't hard numbers to go by.

 

[CyberGus]

From the Tessie app:

Battery Health
Battery capacity decreases with usage. Our Battery Health tracking helps you visualize and track it.

How does it work?

The Battery Management System (BMS) in your Tesla is continuously estimating how much energy is in the battery. Tessie collects capacity and range BMS estimates every time you charge 5 kWh or more so you can track the state of your battery.

Since these measurements fluctuate, it's important to focus on the average and not a single data point.

How are capacity and max range measured?

Capacity and Max Range represent the average of the last 30 measurements sent by your vehicle.

If you have Direct Telemetry enabled, you can see these measurements in real-time under Battery > Energy and Range.

How is degradation measured?

Degradation is the current capacity divided by the original capacity when the vehicle was brand new.

Here's an example of how you can track degradation yourself:

If you charge your vehicle from 0-100% when it's brand new, and the vehicle reports that 100 kWh was added to the battery, your original capacity is 100 kWh.

If you charge from 0-100% again after 100,000 miles, and the vehicle reports that 90 kWh was added to the battery, your current capacity is 90 kWh.

90 kWh current capacity / 100 kWh original capacity = 90% battery health (10% degradation)

Tessie does this calculation for you, continuously. If you didn't use Tessie when your battery was brand new, don't worry — we'll use our fleet average new battery capacity for your vehicle configuration.

If degradation or capacity looks unusually high or low

It's possible that the BMS calibration has drifted and its calculations are inaccurate. You can help it learn how much energy is in the battery by calibrating it.

Determining the original capacity

If you didn't use Tessie when your battery was brand new, we'll use our fleet average new battery capacity for your vehicle configuration. The number may change as Tessie gains more users with the same battery and gets more data about what the average capacity is when the vehicle is factory fresh.

If your battery capacity is reading far above or below the fleet, it's indicative that your battery has a different capacity. You can find the correct value by changing the capacity until your measurements line up with the fleet average.

You can change the original capacity by pressing the number on the gauge and battery health will automatically recalculate.

How can I minimize degradation?

Check out Minimizing Battery Degradation.

What amount of degradation is normal?

Capacity starts to decrease immediately, and tends to stabilize around a 10% loss. Some batteries degrade slowly and level off around 100,000 mi or 150,000 km, but others may degrade and level off much more quickly.

Why was there a sudden change in capacity or range?

This can happen if a vehicle has a configuration change that affects range, like changing wheel sizes, or when Tesla updates range via over-the-air updates.

When this happens, it's a good idea to calibrate the Battery Management System to help it relearn how much energy is in the battery.

How are charge cycles measured?

Charge cycles represent the number of times the battery has charged the equivalent of 0% to 100%. For example, charging from 80% to 90% ten times is one charge cycle.

For the time prior to Tessie tracking your charging data, Tessie estimates charge cycles using the vehicle's real-world energy usage patterns. This estimate will become more accurate over time as Tessie learns your energy usage.



https://help.tessie.com/article/39-battery-health

 

[eswimm]

Sure, but it probably doesn't tell the whole story. It's fine to estimate, but people need to know those aren't hard numbers to go by.

It's a reasonable approximation. It's just an average distribution from the data being provided by the BMS which is already an estimate that can vary based on temperature and cell imbalance. It's probably reasonably accurate, at least +/- 3-5%. It really only matters if it changes suddenly or gets close to the magic 30% degradation number.

 

[REM]

It's a reasonable approximation. It's just an average distribution from the data being provided by the BMS which is already an estimate that can vary based on temperature and cell imbalance. It's probably reasonably accurate, at least +/- 3-5%. It really only matters if it changes suddenly or gets close to the magic 30% degradation number.

yeah, it's probably not terribly far off. I just hope folks don't use those numbers as definitive and absolute factual

 

[AlmostHuman]

9% is quite high for 50K miles; I'd be weary of that number. I hope these apps are coming with huge disclaimers explaining how they estimate.

Yeah I don't put a ton of weight in to the numbers, just neat to see a little more details. It has been around 92 kWh usable for the 15,000 miles so it looks to have leveled off. If everything else is healthy on the ride in the future and the battery is just not healthy enough to make it usable we will just have the battery replaced.

 

[kpanda17]

4680 NCM, my understanding:
after 12 months, -4%
each next 12 months, 1.8%
expect it tapers to 1.5% annually
after 10 years -20%, reason the warranty is in alignment with that
if more then -20, you get a new batt, at -20 nada
seems fair

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