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      12-11-2013, 07:08 AM   #55
zzzbullseye
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Drives: 2011 550i (F10)
Join Date: Nov 2009
Location: St. Louis

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Quote:
Originally Posted by MrDit View Post
They will probably try to tell you that you only drive the car short distances, not enough to charge the battery. The other one I have heard is they tell you they noticed in the car log that you left the lights on overnight. They will then suggest you install one of the trickle chargers. With any luck you can convince them to change the battery.
They diagnosed the issue as a bad cell and replaced the battery under warranty. The warning indicator was being triggered primarily because the turbo cooling fans continued to run after the engine was switched off. This behavior, while normal and to be expected, was causing the battery to discharge to a point beyond tolerance. A healthy battery supports this behavior and can fully recharge - a battery with bad cells cannot.
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