Quote:
Originally Posted by ddbiii
am going to try locking the car while in the garage overnight
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You haven't been locking the car in the garage the whole time?
You've got CA, just tap the handle and it's done. My father in law didn't lock his car in his garage, either... until someone broke in and stole a bunch of stuff out of it.
In general, I think 4 years is average battery life in a warm climates. If you're inside of that and have a good relationship with your service adviser, you can probably get a new one under warranty or goodwill.
I think between the high electrical loads cars have these days, plus the efficient dynamics charging policy (don't charge under acceleration, try to charge only when engine braking) late model BMWs are harder on batteries than before, but they don't want to go to dual batteries or bigger batteries since that would add weight, and the glass mat or other advanced batteries would add cost and make replacement a bigger logistical problem.