Just wanted to pass on my experience with the 12v battery. Ford admitts to getting a bad batch of 12v batteries, all manufactured in 9/2012. Ford was to take all of the batteries off the market, but I think they are still in car out there. My FFH and the same 12v battery experience others here have mentioned. The dealer replaced my battery and the problem continued about 4 weeks after replacement. The TSB came out during that time and they again replaced the 12v battery that had the same 9/2012 date code and applied the TSB. The TSB changed how and when the battery is charged and I have not had the problem since. I also have not had the issue with my MKZ hybrid, but then that was a 04/2013 build.