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      05-14-2009, 07:15 PM   #43
HP Autosport
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Drives: F80 M3
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Originally Posted by swamp2 View Post
HP: Which is it, the 3121 is OK with M3 or only M3 without CA? KEY question here.
Well, we don't know what the CA system is drawing when in sleep mode. If it's more than 40-50 milliamps, we may advice not use any battery with less reserve capacity than the oem BMW.