Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 943)

Labeling Batteries with Serial Numbers
It is convenient to label registered LP-E6NH/LP-E6N/LP-E6 battery packs with their serial
numbers, using commercially available labels.
1.
On a label approx. 25×15 mm, write the serial number (1).
2.
Apply the label.
Set the power switch to < >.
Remove the battery from the camera.
Apply the label as shown in the illustration (on the side with no
electrical contacts).
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