Just got my C-Max back from the dealer for the 2nd time, they found nothing wrong. They thoroughly tested the battery, said that it was OK. The only thing they think might be causing the dead battery issue is that we aren't driving the car enough. So they think the battery isn't getting charged enough, by whatever means it gets charged. So my question to anyone with dead battery problems is- How many miles are you driving it in a week? The last week, before dead battery, my wife probably only drove it about 40 miles. Wife is about done with the car. I will be driving it now, to see if it happens again. I put about 200 miles a week. Thank You for your Input, Jeff