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Charge the batteries in wireless accessories
The Magic Keyboard, Magic Mouse, and Magic Trackpad each have a built-in rechargeable battery.
Check the battery level. Click 
Charge the battery. Connect your Magic Keyboard, Magic Mouse, or Magic Trackpad to your Mac or any USB power source with a USB-C Charge 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.