I've got a 8Bitdo Ultimate Bluetooth controller last year in March, since then it has been my main controller, but as battery is not removable, I was looking for a battery to order and solder it myself.

What was my surprise when I discovered that 8Bitdo Ultimate BT controllers use a specific size of batteries, which isn't like a regular 1050mah 3.7v battery in terms of size, so I'd be wasting money buying any 1050mah 3.7v battery online.

Have you guys find either the specific battery this controller uses, or another battery that will fit in for replacement on this unit?

Thanks in advance!