Due to both my wife and my "unfavorable driving profile". I put the X5 and the M3 on the BMW battery tender once a week over night and it has done wonders. I use the terminals under the hood. I keep the hood open so I don't forget and drive away with the charger plugger in. You can close the hood and not have an issue.
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17 M3 ZCP -- 2017 Range Rover Sport SC
--RIP--
12 X5 50i Sport -- 11 M3 DCT -- 2011 X5 50i(Lemon) -- 2008 550 Msport -- 2007 x5 4.8 sport -- 2004 545 sport -- 2002 x5 4.4 sport -- 2001 540i Msport 2000 SL500 -- 1997 SL500
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