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Charge the batteries in your Mac Pro accessories
Your Magic Keyboard with Numeric Keypad, Magic Mouse, and Magic Trackpad each have a built-in rechargeable battery.
Check the battery level. Click the Control Center icon 
in the menu bar, click the Bluetooth icon 
, then choose the device.
Charge the battery. Connect your Magic Keyboard with Numeric Keypad or Magic Mouse (or optional Magic Trackpad) to your Mac Pro with the included USB-C to Lightning Cable.
Tip: To charge the battery faster, be sure your input device is turned on when you connect it to your Mac Pro.
Learn more. See Disposal and recycling information or visit Apple Lithium-ion Batteries.