Quote:
Originally Posted by Mr.Bimmer
Do you really think it's because she doesn't drive the car enough?
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Yes. Two things kill batteries: 1) Extreme temperatures (which I'm guessing isn't the case if she's in CA, too) and 2) Deep cycling.
You could put an Ammeter on it to see if there is excessive drain when it's parked, but my guess is it's not getting enough distance in her trips to get the thing charged up, or simply not getting driven often enough.
Even in Texas heat, the battery on my wife's Z3 and my M5 did fine until we stopped driving them daily.
I think the M3's charging policy (it tries to only charge when decelerating and tries not to charge when accelerating to eek out a little more mileage) exacerbates the situation.