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.
The iPod nano 3G is open. And as expected, it has a bloated battery. But that can be fixed. It is still working, so a new battery should bring it back.

New battery installed. Tested. Case closed :) iPod nano 3G is back for many more years of service, hopefully :) That was definitely a tough repair. These iPod nanos are quite demanding to pry open. But it is done. Onward to saving more devices from ending up at the landfill.

#RightToRepair

@jwildeboer ... whispering life into old devices. 🙃

@jwildeboer

This old circular button is so nice. You don't have to look at the device to use it to skip a tune or to go back.

@jwildeboer Nice! I also have a 3g nano but have been lucky enough not to have to replace anything in it yet. After relying on my phone to listen to music for years, it's remarkable how well they actually hold up. Simple, elegant, good build quality, actually fits in your pocket, etc.

It won't work for the 3g but you might be able to stretch the capabilities of the gen 6 with rockbox. It would make it easier to load music onto them if you aren't able to run iTunes. I've had that issue with Linux. https://www.rockbox.org/wiki/TargetStatus

TargetStatus < Main < Wiki

TargetStatus

@jwildeboer Metal bucket with sand? At least open the window and be prepared to lug it out.
@jwildeboer Not to be confused with snarkiness. Just be careful with the lithium batteries.
@ofosos I know it’s hard to believe that I know what I’m doing, but I am 56 years old, have 40+ years of experience and I know what I’m doing :)
@jwildeboer Famous last words.
@ofosos Thank you being a troll focused on demotivating other people you don’t know and welcome to my blocklist. Have a nice day!
@jwildeboer question, can you upload files into that iPod from Linux?
@luisfcorreia Yes, with libipod. I don’t need it though, as I have a Mac.

@jwildeboer is that still maintained?
I tried last year from my Fedora Workstation and it wasn't recognized

(came to the conclusion that I have a very similar iPod here with a replacement battery to be replaced... 'soon')

@luisfcorreia I don’t know as I don’t use it anymore.
@jwildeboer Have you upgraded it to larger storage? I know it can be done with some iPods, not sure about this one?
@fahrni No, it stays an 8GB iPod nano. I’m only swapping in a new battery.

@jwildeboer The Nano, like you have, is the best form factor iPod, in my opinion.

I did a little reading and they’re kind of difficult to upgrade. The standard iPod gen 4 and up are — apparently — easy to upgrade.

@fahrni I am more than happy with the 8GB, that's a lot of music already :) I also have a classic 6th gen with the 80GB hard drive, so I never felt the need to upgrade.
@jwildeboer Makes sense. 👍🏼
@fahrni @jwildeboer not sure the nano storage can be upgraded without BGA soldering. the classic/mini was easy because they used hard drives.
@jwildeboer Are the replacement batteries the same capacity as the old ones or was it possible to profit from the advancements in the mean time and get larger capacity with the same dimensions?
@HeptaSean I only know that the replacement battery is 550 mAh, the old one doesn’t say how much it has.
@jwildeboer Wow. Please tell us your experience how easy or hard it was. I have also a nano and a classic. Both need a battery replacement.
Where have you bought the needed stuff? And is there a good how to? Do you need soldering?
@thorsten The best how to is the iPod Repair clinic, a guy with 20 years of experience, sharing his wisdom. https://www.youtube.com/watch?v=5V-ZqzuxN8Q
How to replace the battery on an iPod Classic 6th & 7th Generation

YouTube
@thorsten Yes, you need to understand how these clips work that hold everything together. Because you need force to get them to open. The nano need soldering, the 6/7th gen doesn't.