Nikon D6 Reference Manual page 43

Do not use batteries, chargers, or AC adapters not specifically
designated for use with this product. When using batteries,
chargers, and AC adapters designated for use with this product, do
not:
•
Damage, modify, forcibly tug or bend the cords or cables, place
them under heavy objects, or expose them to heat or flame.
•
Use travel converters or adapters designed to convert from one
voltage to another or with DC-to-AC inverters.
Failure to observe these precautions could result in fire or electric shock.
Do not handle the plug when charging the product or using the AC
adapter during thunderstorms.
Failure to observe this precaution could result in electric shock.
Do not handle with bare hands in locations exposed to extremely
high or low temperatures.
Failure to observe this precaution could result in burns, or frostbite.
Do not leave the lens pointed at the sun or other strong light
sources.
Light focused by the lens could cause fire or damage to product's
internal parts. When shooting backlit subjects, keep the sun well out of
the frame. Sunlight focused into the camera when the sun is close to the
frame could cause fire.
A CAUTION
xliii
For Your Safety