Nikon D780 DSLR Camera (Body Only) - Manual (Page 69)

23 First Steps
D The Battery and Charger
Read and follow the warnings and cautions in “For Your Safety” ( 0 xxxviii)
and “Caring for the Camera and Battery: Cautions” ( 0 832).
D If the CHARGE Lamp Flashes Rapidly
If the CHARGE lamp flashes rapidly (8 times a second):
• A battery charging error has occurred : 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).
If the problem persists, unplug the charger and end charging. Bring the
battery and charger to a Nikon-authorized service representative.