Did 'some' putzing around with the lights for a couple hours.
Then drove the car in EV mode for 20 minutes.
My wife may have driven in EV only mode for past 2 or 3 days.
Got to destination,
got out of car.
closed door and heard a double honk TWO fast honks - Beep Beep.
tried a few doors, all doors gave same double honk
(perhaps car was still 'running'), not sure.
came back out after maybe 30 minutes in store.
Battery Dead, needed jump.
So, question is whether A) how'd I kill the battery
B) if it was cumulative wear on battery, is the lesson learned that owers need to drive in non-EV mode at least a few miles every week to charge the 12V battery.
C) do I have a bad battery or charging system that isn't charging the battery properly.