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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2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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