Amazon also sells a BMW branded charger, but what I have read it's made by the same company as the Battery Tender?
http://www.amazon.com/BMW-Genuine-82...attery+charger
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2011 1M, Valencia Orange, All options.
August 8th ED (#293 of 739 or 740)
88 E30 M3 100% OEM 73K Miles
02 E39 M5 Le Mans Blue 50K Miles
06 E46 M3 ZCP 58K Miles