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Depends on the battery tech I imagine.

LFP batteries are recommended to charge to 100% every time, where as NCA / NCM are both what we traditionally think of when discussing lithium batteries.

I imagine for LFP they will keep it as full as possible, and hard cap the other types to 70%.

More reading here: https://history-computer.com/which-batteries-is-tesla-using/

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LFP batteries age faster when at 100% just like non LFP batteries, but since they degrade slower over time overall, and since you need occasional 100% charges for the battery management system to know what % of charge you are at, it is recommended to charge it to 100% regularly.

if you wanted to protect the life of your LFP battery, don't charge it to 100% every day, just every week or two so the BMS knows what is going on.

For additional context, the reason for this is that LFP cells have a much flatter voltage curve than other chemistries [1], so the BMS is forced to guess at the state of charge by tracking how much current has gone in/out of the battery, which is subject to drift.

1: https://www.researchgate.net/profile/Anupam-Parlikar/publica...

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