Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 942)

Registering Batteries to the Camera
You can register up to six LP-E6NH/LP-E6N/LP-E6 battery packs to the camera. To register
multiple batteries to the camera, follow the procedure below for each battery.
1.
Press the < > button.
With the battery info. screen displayed, press the < > button.
If the battery is not registered, it will be grayed out.
2.
Select [Register].
3.
Select [OK].
The battery is now displayed in white.
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