I have a few cassette and MiniDisc portable audio players that use "gumstick" NiMH batteries -- but I didn't have a way to way to easily recharge them. Instead of buying a charger, I made an adapter that lets me use one I already have.

The 3D model file is available here:
https://www.thingiverse.com/thing:470...
https://www.prusaprinters.org/prints/...

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Music by
Aviscerall (https://aviscerall.bandcamp.com).