Just to add to the common thread.. Our C-Max SE was purchased in mid October. I'm in the NorthEast, it is cold, but the car is garaged. I have had many battery failures, but only in the mornings after an overnight in the garage. After jumping it a few times and finding nothing wrong, the dealer replaced the battery with a brand new one, but that didn't help. The dealership has now kept the car for as about as much time as we have had it. I believe we are reaching lemon law territory, and we should find out how things will proceed tomorrow with the service manager. The dealership has been very good to work with, though it obviously is frustrating to have to spend the time on this.