[TRider86]

Why are the12v batteries going dead? Defective? I thought the drive batteries keep the 12v charged.

It will until the main battery gets so low. 30% charge and letting it sit 5 days is the problem. The vehicle still runs the cooling system to maintain battery temps. Plus if the software did a OTA update during that time. Real question is why was it allowed to sit 5 days at such a low state of charge anyway? Plug it in when you go on trips