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Old 03-06-2019, 08:17 PM   #12
ZBB
Relic
 
Join Date: Oct 2003
Carmudgeonly Ride: A very fast golf cart
Location: The Valley of the Sun
Posts: 12,821
I don’t understand your infatuation with babying the battery.

It’s ok to take it below 20% and over 80%. What you don’t want to do is let it sit at 100% for long periods. That’s why Tesla defaults to a 90% charge. Keeping it closer to an average state of charge of 50% is best for the battery — but that’s based on time.

I put 93k miles on a Model S 60 (which had 208 miles range) over 5 1/4 years. I also normally charged it to 90%, and only charged to 100% when I needed to for a road trip. I typically would plug in anywhere between 25% and 60% to charge, so probably had an average state of charge of 60-something percent (since that is really hard to measure...). I occasionally took it below 10%. When I sold the car, it had <10% degradation - my last 100% charge was 188 miles.
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