magic mouse

My brand new Magic Mouse works okay, except when I switch to Windows 10, which I added via Boot Camp. Then the mouse doesn't work at all; the cursor does not even appear on the screen. The keyboard works with Windows. Both mouse & keyboard came with the desktop.

I tried checking the bluetooth devices screen, and it lists Bluethooth as on and Magic Mouse as connected. I also tried updating the mouse, but it simply says it's the most recently updated version already.

Also checked to make sure the mouse is switched on.

PS Is there a way to know how much juice the magic mouse has? I tried charging it, even though I thought it was charged. Still nothing.