Nikon D810 - Manual (Page 478)

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Storage : To prevent mold or mildew, store the camera in a dry, well-
ventilated area. If you are using an AC adapter, unplug the adapter to
prevent fire. If the product will not be used for an extended period,
remove the battery to prevent leakage and store the camera in a plastic
bag containing a desiccant. Do not, however, store the camera case in a
plastic bag, as this may cause the material to deteriorate. Note that
desiccant gradually loses its capacity to absorb moisture and should be
replaced at regular intervals.
To prevent mold or mildew, take the camera out of storage at least once
a month. Turn the camera on and release the shutter a few times before
putting it away.
Store the battery in a cool, dry place. Replace the terminal cover before
putting the battery away.
Turn the product off before removing or disconnecting the power source : Do not
unplug the product or remove the battery while the product is on or
while images are being recorded or deleted. Forcibly cutting power in
these circumstances could result in loss of data or in damage to product
memory or internal circuitry. To prevent an accidental interruption of
power, avoid carrying the product from one location to another while
the AC adapter is connected.