Have a 2006 outlander just put a new battery in a few months ago.Had no problems with it.Then it sat for a couple weeks and it would not start.Charged the battery with a tender and still nothing we read the battery and it says 13v.All i get is a few click click click when you push the start button.Then nothing at all like the battery is completly dead.What could this possible be.Need some help where to start.Thanks