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I believe these batteries start to go when little things start screwing up. Last winter I was driving along, then all of a sudden the doors unlock, the windows drop down (as if I was opening the door), the doors lock again and then the windows go back up. All while cruising down the street. Did this a few times then stopped. Didn't change the battery yet ('16 M235i) but I will if it starts to do this again.
Chris
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