Very common practice in music gear industry, unfortunately. I've recently bit the bullet and bought MyVolts Step Up for $20, it is literally a PD trigger worth maybe 50 cents plus a plug.
The author didn't go far enough, should have ripped out the battery holder, installed a single lifepo4 or lipo, added a USB-C charging/protection board and a low quiescent current LDO to simulate 2.7V a couple of freshly charged nimh's puts out.
> Conclusion
> It is absolutely possible to do this, but the resulting battery pack won't be nearly as solid as even the third party packs that are available. With the amount of time required to fiddle with the connection paperclip and winding the temperature sensor leads around a tiny plastic tab it is probably not worth it to print your batteries.
Which is silly because they seem to struggle with maneuvering around the little plastic tab to have the battery detected as rechargeable.
Should see the shure ones. Shure SB900C is like $115. And at least last I looked I never saw any aftermarket ones.
At 8 mics and 6 in-ear packs you can get a lot of alkalines.
I'm glad most of my music gear isn't battery powered. I do have a painful amount of different camera chargers though...