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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 in the menu bar, move the pointer over the Bluetooth item, then click the arrow next to it.
Charge the battery. Connect your Magic Keyboard, Magic Mouse, or Magic Trackpad to your Mac with a 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 iMac.
Learn more. See Disposal and recycling information or visit Apple Lithium-ion Batteries.