Re-read the manual's description of the battery warning light...it's one of the most misunderstood warnings.

It illuminates when the battery is the VICTIM...not the culprit:

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)