Calibrating Batteries - Nikon Z 9 Reference Manual

Calibrating Batteries

The MH-33 battery charger can detect whether batteries require
calibration and calibrate them as necessary to ensure the accuracy of
the battery level display.
Calibration status and progress are shown by lamps on the battery
charger:
Charge lamps
1
Calibration lamp
2
If the calibration lamp flashes when a battery is inserted, the battery
needs to be calibrated.
Compatible Accessories
850
CHARGE %
6h 100
4h 80
2h 50
CALIBRATION
Calibration button
3
1
2
3