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This condition does not sound normal, instead it sounds like you may have had a power leak on the 12V circuit (defect on a electronic component or a sticky relay maybe). I would have measure the current drain on the battery to get data points when the car is stopped and running to get data point, and I would have had the car check with another dealer (I does not sound to me that the personnel you dealt with was very helpful - unfortunate that this translate to the review of the vehicle) and brought up the case with Ford Customer Relations. I have had my C-Max running on electric only for couple weeks and after 18 months never had the 12V battery go weak. The 12V circuit is charged by the high voltage battery during electric use through DC-DC converter.Report it
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