Battery drain while parked? Ok idk if i’m super paranoid but yesterday i was waiting with the car parked (2010 prius) for my gf to get off work and was at like 6 bars when i parked and then i looked at it probly 5-10 mins in to waiting and it was at like 2. Is this normal? I did have the heater on but i feel like that shouldn’t make it drop that fast. Ty in advance:)