I bought this one. It has a built-in battery that is connected to the board with a standard (?) connector cable. The mouse can be opened with one screw underneath the gliding pad. I have this mouse for over a year now and I’m satisfied with it. It lasts 7 days with RGB-Lights switched on up to 10 days with RGB lights switched off - depanding on usage. You can operate up to 3 devices with it (BT 5.0, BT 3.0 and wirelessly with the dongle held with a magnet underneath the mouse when not needed. It can be charged with the USB C port. It can be charged while in use. Unfortunately tho, the mouse seems to be out of stock at Amazon. Perhaps other shops have this device listed. I obtained the mouse in Germany.

Edit: This is the mouse opened (I had to clean it because it was operated in a feline enviroment). The battery can be replaced easily:

But dare to throw them away. Just two weeks later you will need that one AC adapter with that weird propetary connector for an old device you found while cleaning up that hasn’t been in use for the past 25 years.