Amazon.com: SWARK Battery 616-0531 Compatible with iPod Nano (6th Gen) Model A1366 Battery with Tools : Electronics
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
Battery for Apple iPod Nano 6th Gen Generation 16GB 8GB 616-0531 A1366 MC525LL/A
Old school iPod Nano battery replacement – Fix It Workshop
iPod nano (6th Gen) Battery
Original New Replacement Battery 616-0531 For Ipod Nano6 6g 6th Generation Mp3 Li-polymer Rechargeable Nano 6 Batteries + Tools - Mobile Phone Batteries - AliExpress
Wholesale 3.7V 110mAh Replacement Original 616-0531 Battery for iPod Nano 6th ipod nano 6th generation From m.alibaba.com
Battery for Apple iPod Nano 6th Gen 16GB 8GB 616-0531 A1366 MC525LL/A w/ Toolkit
Old school iPod Nano battery replacement – Fix It Workshop