[my123]

Apple stops selling parts for old products 7 years after they are discontinued.

[babypuncher]

Batteries are pretty simple, you can still get replacements for old iPods.

[asdff]

They were simple back in the days before Apple thought of brilliant ideas like glueing the battery to the laptop topcase. The old iPod is like a crude raspberry PI casemod in comparison, workable for anyone with nimble hands and good eyes.

[m463]

I'm guessing the aftermarket may help with this.