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It did, but the battery cooled. That SOC reflects an estimate based on temperature. A few percent “loss” is typical in cooler weather. If the battery heats up, it’ll show 80% or higher.

That ChatGPT response is misleading at best, is blatantly wrong on a few of points, and should just be ignored. If you care about your battery’s longevity, concern yourself with battery storage conditions (temp and SOC) and less so how you charge or use it.

Here's a more relevant quote from Tesla: "To maintain service life, the battery pack should be stored at a state of charge (SOC) of 15 to 50%." CT EPA application, page 13: https://dis.epa.gov/otaqpub/display_file.jsp?docid=58898&flag=1

"Pretty good" depends on what standard you're using. My old Model 3 will charge at the same power at the same SOC, but with a battery that's only 60% the capacity of the Cybertruck's. To charge at the same C-rate as a 7-year old Model 3, the Cybertruck would need to charge at more than 350kW...

I'd like to see evidence that supports your concern about low SOC. There's plenty of evidence to the contrary, such as this:

Here're updated graphs with Ryan Shaw's charging data from his YouTube review (at 11:00). Both these charging sessions overlap remarkably well. Therefore, This builds my confidence that this charge curve represents an optimal charge session for today's hardware and software configuration...

The on-board charger is limited to 48A, per Tesla's documentation to the EPA: Ref: https://dis.epa.gov/otaqpub/display_file.jsp?docid=58897&flag=1

As well stated by @JBee, 800v charging does not significantly improve charging speed over 400v when the charge power is cell limited. I think that is what we're seeing now with the 4680 Cybercells in the Cybertruck for a majority of the charging curve. The reason why I think it's cell limited...

With a reasonable extrapolation, this charging curve meets Tesla’s stated charge rate spec of 136 mi in 15 min for the DM CT. 136 mi is 40% of the 340 mi total range. It should be able to charge from 0 to 40% in 15 minutes. With a reasonable ramp up to 250 kW from 0%, maintaining 250kW until...

Unfortunately, it was only preconditioned for 20min. We don’t yet know how much power the CT motors can put into heating the battery pack but it very likely isn’t near enough to heat the pack from 70 F to above 100 F in that time. I think we can conclude two things from this charging...