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All BMW batteries need to be registered . If you go with the Black AGM battery the vehicle has to be programmed and retrofitted for that battery. I don't know if I agree that the bigger battery will help with your aftermarket electronics because most dealers offer the black 900cca AGM batteries to customers that let there vehicle sit for extended periods or do a lot of short trip driving . They off this battery because they don't deplete as fast as the white housing batteries.
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