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ran trickle charger but..
car starts ok but the battery window showed no green, instead a black window. I charged overnight with bmw charger and the final steady green lite on the charger indicated that the battery supposedly was fully charged. I disconnected the charger but the battery still shows a black window. Car starts fine but can't get a cursed green window on the batt. Car is '05, don't know batt age.
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