Ipod Nano says full charge or connected even when battery is empty?

I have an Ipod Nano 4th generation 8GB, but it has a problem. when i got it, it was completely dead and when i plugged it in it would report a full charge. So when i would unplug it, the thing would die. 2 days ago it randomly begun charging and charged to a full charge, but the battery gauge said it had a full charge and was still charging. After this it is not charging again, no matter what im using to charge it. It will show the charging emblem then go to plugged in mode. I put it into diagnostic mode and checked the charging current. it reports 0.0 ampres. When i first got it before it charged it when i put it into high power mode it would shut down the cpu and report low voltage from the battery. Any help or suggestions would be great. Thanks

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