I got the tools. I got the new batteries. Now wish me luck for replacing the batteries of my 20+ year old iPods. A classic gen 6 and a 3rd gen Nano.
@jwildeboer my
iPod Classic 5th generation music player was still working fine in 2017 - I'd flashed the retro cassette theme on Rockbox firmware on my mine — https://www.youtube.com/watch?v=CyYHYCNk9IM. These were really quality devices. Hope it lasts as long as my HP41CV has!
Retro cassette theme on Rockbox firmware playing on my iPod Classic 5th generation music player

YouTube