Default Galaxy nexus charging problem?

I have a sprint galaxy nexus. I went to camp for a week after turning it off on a half charge. When I came back I tried to turn it on but it immediately shut back off. I plugged it in for a couple hours and it did kind of charge, but the charge icon came on then it displayed the charging animation/battery percent for a second or so at most then rebooted into the icon, then charge animation. It keep cycling and does NOT hold a charge. When I turn it on after a little bit of charging, it says 50 or so percent battery but EVEN IF I KEEP IT PLUGGED IN it still goes down very rapidly. A charge like that goes back to 0 and shuts off within 5 minutes. I'm wondering if I actually killed the battery, or if it can be saved, or if it isn't even a battery issue but a software issue or something. Any help is greatly appreciated.
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