uh o, bad battery?

[Trick440]

My battery or charger is messed up.

Its a 4s battery but when hooked up the the 4 cell slot the charger says no balancer is hooked up. If I plug it into the 3 cell slot it recognizes it but it only charges it for a few seconds and it says its done.

Did I mess my battery up? I drove it probably pretty low about 2 weeks ago. It didnt shut off or anything but I had about 30 minutes of run time on it. So it sat for 2 weeks in that condition... Do you think I ruined a cell? Its a new battery other than maybe 5 charges on it.

Maybe its just a pulled wire or something but everything looks fine.

What should I do?