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      10-27-2012, 05:08 PM   #22
pbonsalb
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

Posts: 1,547
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The car's electrical system is sensitive so the alternator charges the battery variably as it ages to keep just the right voltage and to prevent over or undercharging. New and old batteries charge differently. All the BMWs from about 2008 are like this. I think they are also AGM.
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