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In terms of battery health, what's going on is that the car will periodically do cell balance operations. Sometimes this happens at the start of charge "bottom balance" sometimes at the end "top balance". This helps to keep the cells, well, balanced which is to say they all have the same...

Somewhere in the manual it tells you what happens with the 12V battery when the car is parked for an extended period. If I remember correctly, the car will use the traction battery to charge the 12V battery once per week.