I think there is a lot of misinformation from tesla about this -or at least there was once upon a time. Or people just interpret anything they want into teslas gui. I.e. there is a persisting myth that tesla batteries are best stored and cycled at 50% when there is virtually no evidence thereof. Indeed every single study shows that lithium ion batteries last the longest when operated and stored at the lowest SOC possible. There was big list here before on energy manufacturers recommendation on how to store their lithium ion batteries and most advise a discharge to 0% and then freezing them or leaving them in a cool room with only one manufacturer recommending 10 or 20% for storage....
Even when the battery is stressed at i.e. 5% SOC it still has a longer life than being stressed at 80%. The acceleration limitation is imho likely there to just prevent undervolting of cells by chance as that is indeed bad for the battery.
The primary benefit of not going to 100% is not storage but that limiting max charge to 90% doubles battery life. Thats the reason the original roadster was limited to 4.15V (92%). This is further amplified on the model 3 in that there is a 4.5% buffer and most people never discharge to 0% so the usual daily cycling is actually quite low...
Because this is all BS Tesla actually stopped talking so much about 100% charges - and it also confuses LPO owners who should charge to 100%. So on newer software versions the NCA/NMC display is rather silent and just calls 90% a daily charge and 100% a trip charge and the manual doesnt really make any reference to not letting it sit at 100% or not going to 100% regularly. I am not sure if the message which warns of using 100% as a daily charge if you repeatedly charge to i.e. 95% all the time still exists.
Elon himself actually told someone on twitter but was complaining about low(er) winter range to just charge to 95% every day and it doesnt really matter that much. He advised against 100% charge because the owner wouldnt have regen.
Good graph showing you how much degradation you get from 10% cycles at varying SOC levels. As you can see the lower you cycle the battery, the better with there being a sharp decline cycling above 50%. What I also find interesting is that the 10-0% charge is still the best even though arguably they must have undervolted some batteries by accident by going to 0% every time.... perhaps even undervolting isnt as bad as we all think as long as we dont undervolt too much. They used a 2C discharge rate so thats driving a model 3 at like 200km/h....
do note that for this study they used 4.15V as 100% which corresponds to like 92% on tesla vehicles.
Either way whats becoming abundantly clear is that calender aging is WAY more important than discharge rates and recharge rates and cycles...
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