We have 2013 cMax and the 12v battery has failed twice. Once at about 900 miles and again at about 3700 miles. Both times car towed to dealer, both times battery replaced, both times told never heard of this issue. First time could not jump to get lights on. Second time lights on and out of park, but would not run. Tow operator stated that the battery was an issue with the CMax and Ford has no fix. Dealer mechanic keeps asking what was left on in the vehicle. We were using the auto light feature but since have stopped using this feature, just turn lights on and off manually, what a bummer! Previous autos had this feature and it worked fine. On our Saab we never turned the light switch off, so the lights were on every time the auto was started and never had an issue with a dead battery. Seems the switch worked very well. Have not seen any restart indication as some have posted, ie, bad relay or other electrical component. Last time in dealer was asked to do the reprogramming for the transmission. Stated this was not done and would be done when headliner parts came in as it takes up to 4 hours to download, is this so?? However, something was done to the computer system as the mileage indicator and battery usage images are now different, so we believe something was done though dealer says no!? Some have stated that Ford got a bad batch of batteries, I find this somewhat disconcerting. Dealer stated this "may" have been the issue on first failure. Still sound "fishy" to us.
