Battery ....RIP,......... Death By Polar Vortex??

……….Have you checked the charging system?
Dash meter is positive. I'll verify with a real meter today. The replacement battery checked 12.6 V after load test before it came off the stores counter top and followed me home.
….and Keyless proximity sensors.... Dont leave your keyless Fob in the car ....
Hmmm......Never do (intentionally) Now the other car, key in coat pocket, hanging on rack attached to wall, car on other side of wall in attached garage. Probably within 10'. How close is "too" close?