iPod 4th generation cannot be charged fully
Hi,
Recently when i charge my iPod 4the generation, i have been recieving temperature warnings but my iPod is not hot. I purchased my iPod back in 2010. And furthermore, it cannot be fully charged. The top right notification bar shows that the ipod is charged, but the screen saver only shows 80%. When i unplug the ipod, after charging it for about 4hours, it still shows only 80% batttery. My iPod battery drains very fast now that this problem has occurred. What happened and what should i do?
iPod touch, iOS 5.1.1