LeftieBiker wrote:I suggest that you insist on a brand new 12 volt battery, as that one is definitely damaged. And make sure they bench charge it to 100% before installing it. You may also want to invest in a Battery Tender JR, which can keep the battery topped off, although it's small and slow. Hopefully you won't need to do what I did with my Leaf: install it hardwired to the battery, with the connector run into the charging port compartment.
The Bolt is supposed to automatically maintain the 12V battery if there is sufficient charge in the high voltage battery. I don’t know what level that is, though. Also, if you plug the car in to charge, it will automatically maintain the 12V battery while plugged in. If you plug in every night to charge, or even just once a week, then the Battery Tender Jr may not be necessary.