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      01-06-2013, 11:14 AM   #5
roundel335
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Drives: 13 335i Sedan, 11 128i Cabrio
Join Date: Apr 2010
Location: Leland, NC

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I believe the condition under which the alternator only charges on deceleration is in Eco-Pro mode, so if you drive in that mode a lot, you would have to drive further to get the same amount of charge as with other modes. With a new battery, you could easily go 2+ weeks without needing a charge. When the car passes the 3-year mark, that interval could shorten, as our batteries have tended to last roughly 5 years. That's when my E92's battery needed replacing.
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2013 F30 335i M-Sport 8AT/MPE/MPPK, 2011 128i M-sport Cabrio 6MT/PE
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