These iPod Nanos I have, now show the evolutionary chart of expanding batteries. Doesn't chance the fact that all of them are now useless. : r/Wellthatsucks
Lot of 2 Working Apple 8GB iPod Nano 4th Gen with Weak Batteries | eBay
Batterie pour Apple Apple iPod nano 3 Generation A1236
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