u/HalfBlu3

I'm fixing a power bank + grip for my Gameboy Advance SP. I picked it up today only to find the batteries are shot. I opened it up and it takes gumstick batteries like you'd find in minidisk players. I'm hoping to solder some new batteries together to restore the grips functionality. Anyone know of any good battery brands I should use?

I was going through my old onshape files and found some kind of 9mm MWS that I copied a little over a year ago. I'm not sure who the original creator is, or even how I found it. Does anyone know who/where this is originally from, and whether it actually works? I'm curious to try it but hesitant since I'd need to buy a bunch of mws springs and screws to try and build this.

Edit: forgot the link to my copy