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One the vehicle says replace battery it will not go away with charging. BMW's have a chip in the battery once the battery is below a certain voltage for a certain amount of time, it trips the fault and replace battery light will not go away unless and new battery is installed and programmed to the vehicle. Honestly it's complete BS there's no way the batteries are actually bad. They easily could be charged and operate fine, but once it throws that fault code. There is no way to get rid of it except replacing it. There is no replace battery recall on the X7
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