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      12-20-2012, 04:25 PM   #10
Second Lieutenant

Drives: 2013 M5
Join Date: Aug 2012
Location: NC

iTrader: (0)

I had the clock issue. I took my car to a local mechanic that works on BMWs and had them replace the battery and register it with the system. Cost me $250 for a 720CCA (900 CA) Interstate Battery. The dealer wanted $500. My problem went away. I've also noticed the car "boots up" quicker now. I've read that the car has some battery management system that prioritizes what starts up and gets juice so that enough power is left to start the car when the battery gets weak. So far, so good for me. My car is an 08 with just about 45K miles.