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I've been having the same problem with my 2011 135i, which was bought in April of 2010, so the battery is 2 1/2 years old now. My dealer also said they get a lot of complaints about this from people who don't drive the cars a lot (I have 17k miles on mine, but haven't been driving as much since I retired in May of 2012). My previous car was a 2002 330i, and it still had the original battery when I sold it in 2010. I guess it's time for the trickle charger.
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