Nikon Z9 Mirrorless Camera - Manual (Page 74)

74 Charging the Battery
D Caution: Charging EN-EL18d Batteries
EN-EL18d rechargeable Li-ion batteries are not compatible with MH-26a or
MH-26 battery chargers. Be sure to use the MH-33 when charging EN-EL18d
batteries via a charger.
D If the Charge Lamps Flash Rapidly
If the charge lamps flash rapidly (8 times a second):
• The battery was not inserted correctly : Unplug the charger and remove
and reinsert the battery.
• The ambient temperature is too hot or too cold : Use the battery charger
at temperatures within the designated temperature range (0–40 °C/+32–
104 °F).
If the problem persists, unplug the charger and end charging. Bring the
battery and charger to a Nikon-authorized service representative.