Our C-Max SEL is three years old (30,000 miles) and has been without any problems. We LOVE the car. Yesterday we get in it and it is dead. Nothing! Called and got a jump start and it has been fine since. It drives me crazy not knowing why this happened or that there is no way (that I know of) to find out about the health of the 12 volt battery. Anybody else having this issue? Thanks.