Charging a wireless mouse
Hi can you tell when the wireless mouse is fully charged?
Mac Pro
Question marked as
Recharge the built-in battery in your Apple keyboard, mouse, or trackpad - Apple Support
"You can check your device's charge level by choosing its name from the Bluetooth icon 
in the menu bar at the top of the screen."(Enable the menu bar icon in Bluetooth system preference.)
You can also see the charge in Mouse system preference.