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Charge the batteries in your accessories
Your Magic Keyboard and Magic Mouse 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 or Magic Mouse to your iMac with the included USB-C to Lightning Cable or Lightning to USB Cable.
Tip: To charge the battery faster, be sure your input device is turned on when you connect it to your iMac.
See Disposal and recycling information or visit Apple Lithium-ion Batteries.