iPod Nano 6th Gen Battery Replacement From Start To Finish. - YouTube
Original New Replacement Battery For Ipod Nano6 6g 6th Generation Mp3 Li-polymer Rechargeable Nano 6 616-0531 Batteries + Tools - Mobile Phone Batteries - AliExpress
Replacement batteries for Apple's iPod Classic, iPhone, Touch, Mini, Nano, 1st Gen, 2nd Gen, 3rd Gen, 4th Gen, and Video | iToolBatteryKit
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 16GB 8GB 616-0531 A1366 MC525LL/A w/ Toolkit
iPod Nano 6th Generation Repair Service - Repair Sharks