Although my car is a Corolla I think the topic is a general one.   My car had been parked in the garage and left, doors closed, but not locked.  When I next went to the car the car Battery appeared to be flat.  I think an interior light was on and dim and certainly did not bright up when the door was opened.  The central display did not light up and the car was otherwise dead. I connected a Ring charger to the Battery and switched it on.  The charger lights then flicked between chargin