The API shows a value named "battery health level". What is it?

[ME2U]

These are from whenever the car was last awake. Interesting to watch while preconditioning or charging.

I confirm, just check a few minutes ago, after a 30 minutes pre-conditionning (via app) the min cell t°went from -6°c bat t° to +2°c (outside -8°c from cold -12°c night), so it works and I recover full speed recharge capabilities (no blue restriction on the charging page) but at those outside temp, 30 minutes is not enough to recover full REGEN CHARGING. Still have a blue mark on the battery shown in cluster + mesage). Then I recharge with my home 11kw charger from 54% to 69% (about 1hr 10min) and now bat t° has peak at 13°c. All good to go
Bottom line, with cold (Canadian like) winter we need to know those number to maximize range before leaving on a trip. And if I don't go too far I think it is a good battery care habit.