outlander will not start help

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

I would try to start it with a charger hooked up in boost mode. You might have a faulty battery or a dead cell? Also make sure your connections are tight.

I did recharge it with a car battery charger it started right up.
Battery shot?

See how long it holds the charge. If it keeps starting your good to go, if not I would replace it. Good luck