Battery for Apple iPod A1199 Nano 2nd Generation Gen 616-0311 2gb 8gb MA725LL/A | eBay
How to install a iPod Nano 2nd Generation Battery - YouTube
Apple iPod Nano 2nd Generation 2GB 4GB 8GB Replaced New Battery-All Colors | eBay
Replaced the dead battery in an old iPod Nano I bought (really wanted a cheap Product Red one) and not even 2 days later the replacement battery expanded. I would call this