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Originally Posted by Ironwood
Well, this morning the battery was dead again and my wife's new X3M wouldn't start. The new battery lasted one week. She put 100 miles on it in four trips to her work and home again. Had to take my wife to work, jump it off and take it to BMW again. By the time I made the trip to the dealership, it was charged up and would start every time. The tech thinks maybe my wife is still leaving it unlocked in the garage and the radio on playing her CD all night. I find it difficult to believe that shutting a $80,000 vehicle off with the button and walking away will kill the battery. They're claiming you have to lock it every time, keep the key far away, press and hold the radio off button, and not leave any papers in the seat. But they said they would investigate and call me in the morning.
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Maybe rule it out by locking it every night for a while. Garage or not, I'd never leave mine unlocked.