One problem related to battery dead has been reported for the 2012 Ford Fusion. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Ford Fusion based on all problems reported for the 2012 Fusion.
If my car sits for more than three days, the battery is dead. I've taken it into the dealer multiple times (at least 5 or more times, now I just live with the problem, since it's no longer under warranty). The Ford dealership said they couldn't find any issues. All they did, is recharge the battery a few times and eventually, replaced the battery. Even with the newer battery, it still has the same problem: dead battery after three days. If I charge the battery up to 100%, twenty-four hours later, the % rate has dropped about 35%, down to level of 65-67%. It's down this since I bought the car when it was new.