First some advice: If you experience this problem once, I recommend equipping yourself with this handy device (MAXMADE® 11000mAh Dual USB Power Bank/Car Jump Starter Made of 400A-Peak-Current LiFePO4 Battery Up to 15 Ignition Times at Full Charge Perfect for Starting Your Car in Emergency with Ultra-bright LED Flashlight And Dual USB Output Also Charge for Apple and Android smartphones, tablets, and other USB-charged devices (White) -- on Amazon http://www.amazon.com/dp/B00K7UXT2O/ref=pe_385040_121528360_TE_dp_1 ). This will give you the peace of mind that you will never be stranded. I've struggled with this one on my (otherwise beloved) 2013 CMAX Energi. One additional tell tale sign of impending doom were the Activity messages on MyFordMobile, along with associated text messages warning "12V battery is low". Yesterday my dealer (Lindsay Ford in Wheaton, MD) ran battery diagnostics, then replaced my 12V battery, and ran some (unspecified) software updates. Now, I'm hoping for the best. @Ashley: Could you please connect with me, and check that all of the appropriate service bulletins have been applied to my car? I think my usage pattern for the CMAX may stress the 12V battery. I drive about 55 miles per day roundtrip, charging overnight, and at work. So my net mileage on the ICE is only 4-6 miles. My guess is that the 12V battery does not get charged when the car is plugged in to charge. Can anybody confirm/deny this guess? If confirmed, it would seem an odd design choice. Buying gas once a month is a big win. I'm hoping I can get past the dead battery issue, since otherwise, I'm VERY happy that I got upsold to the Energi (I originally intended to buy the hybrid). Things my dealer did NOT tell me: 1) MD offers HOV stickers for plug-in EVs....this saves me a little bit of time, but gives me immense pleasure 2) MD offers an excise tax rebate, even for lessors.
