My iPod nano battery expanded and cracked the whole device open. I almost literally cried, as I loved that little device too much.
Getting a replacement is not an option as any iPod nano battery is about 10 years old now. A sign of what will happen to all the Apple Watches out there.
The SSD adapter and drive are available but I can't get hold of the iPod back. The instructions I saw say that the edges of the case get damaged ... and I'm clumsy.