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I like the idea of a vertical mount in the earcups: If the battery dies you click it open, slide out the dead one, slide in a fresh one, click it closed, and listen for a bunch more hours

And keeps a perfectly functioning device out of the landfill!

At a quick glance the hardware for this is compatible with Lithium Ion chemistry so go for it. Just need to make some minor mods to put a battery holder on.

More specifically, just about any headphone with a LiPo (flat square) battery could be modified to accept an 18650. The charging voltages are the same, so you would just have to snip the old battery out and wire in an 18650.

Yeah, I've seen a few TP4056 charging boards with Type-C as well. Will try retro-fitting them into my Crusher Wireless.

These are overkill and way too heavy for headphones

I don't mind them as long as the weight is balanced out with clamping force or higher up the band. There's even smaller sized cells which go into electric toothbrushes as well. The point is to have cells that can be sourced easily & replaced without much fuss which these LiPo packs do not enable.