Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 939)

Battery Information
Registering Batteries to the Camera
Labeling Batteries with Serial Numbers
Checking the Remaining Capacity of a Registered Battery Not in Use
Deleting the Registered Battery Information
You can check the conditions of the battery you are using. By registering multiple batteries
to the camera, you can check their approximate remaining capacity and usage history.
939