Amazon.com: iLuv I602BLK Rechargeable Extended Li Battery for iPod Nano w/ Silicon Skin & Adapter : Electronics
My 4th Gen iPod Nano With A Expanded Battery | 3 Months Ago And Now : r/ipod
iPod Nano 2nd Generation Troubleshooting - iFixit
My favorite iPod nano just got the black spot meaning plugging it in may make it catch fire or explode. : r/Wellthatsucks
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