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Something must be active in the car and not shutting down properly after parking it. It would be something benign, but left on for long periods could kill the battery (i.e., vanity mirror light, glove light, trunk light, etc.)
Another theory could have to do with the proximity of her key to the car at night. The issue usually just kills the key battery, but not the car.
Did you have any aftermarket elements installed? Alarm upgrade? Sound upgrade?
Anything plugged into the USB's wouldn't drain the battery once the car is shut off.
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2011 1 Series M Coupe VO M3 vs 1M Comparo Review
2011 M3 E90 DCT ZCP (sold) * 2010 335i Sedan (sold)
2005 M3 Convertible (sold) * 2003 325i Sedan (sold) |