Original Battery For Ipod Nano 1 2 3 4 5 6 7 4th 5th 6th 7th 1st 2nd Generation 2 Gen 2gen 3rd 3 Gen 3gen + Free Tools - Mobile Phone Batteries - AliExpress
Replacement Battery For Apple Ipod Nano 6th Gen 3.7v/0.39 Whr Li-polymer Rechargeable Battery With Opening Pry Tool Kits - Digital Batteries - AliExpress
Battery For Apple Ipod Nano 1st Generation 1 Gen A1137 4gb 2gb 1gb 616-0224 New - Digital Batteries - AliExpress
Apple says stop using first-generation iPod nano due to battery overheating, opens worldwide replacement program - 9to5Mac
Apple Officially Ends iPod Nano Replacement Program, but Still Honoring Requests - MacRumors
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