cause it isnt charging
i got it 6 months agoHow much does it cost to change the battery on an ipod?
If your iPod is out of warranty you can send it in to Apple $59. http://www.apple.com/support/ipod/servic
You can also buy a batter from http://www.ipodjuice.com/ for $29, but you have to replace it yourself. They give you instructions and a tool kit.
Here's some FAQ about iPod batteries http://www.ipodbatteryfaq.com/6How much does it cost to change the battery on an ipod?
if you bought the 1 year guarantee it will cost you nothing. mine did the same thing. all you have to do is send it back and they will change it or give you a new one. hope I helped