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I didn't read this entire thread but I will say this: modern vehicles don't do well when only driven for very short trips. With all the electronics these days most vehicles will have difficulty keeping their battery charged unless driven longer distances. This not a 'defect' in BMWs, or any other vehicle, just the way it is now. My suggestion for the OP is to drive his vehicle more often and for longer distances. Manufacturers have talked for years about cars eventually having 2 batteries, maybe that will one day happen..
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