did you replace the battery yourself? if so, check the connections.
otherwise, check for draw when the car is off, if none
check your alternator is charging the battery correctly
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff