Nikon D810 - Manual (Page 351)

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To ensure that the camera functions as expected when the
optional MB-D12 battery pack is used with AA batteries, match
the option selected in this menu to the type of batteries inserted
in the battery pack. There is no need to adjust this option when
using EN-EL15 or optional EN-EL18a/EN-EL18 batteries.
d12: MB-D12 Battery Type
G
button ➜ A Custom Settings menu
Option Description
1
LR6 (AA alkaline) Select when using LR6 alkaline AA batteries.
2
HR6 (AA Ni-MH) Select when using HR6 Ni-MH AA batteries.
3
FR6 (AA lithium) Select when using FR6 lithium AA batteries.
A
Using AA Batteries
The capacity of AA batteries drops sharply at temperatures below
20 °C (68 °F) and varies with make and storage conditions; in some
cases, batteries may cease to function before their expiry date. Some
AA batteries can not be used; due to their performance characteristics
and limited capacity, alkaline batteries have less capacity than some
other types and should only be used if no alternative is available and
then only at warmer temperatures. The camera shows the level of AA
batteries as follows:
Control panel Viewfinder Description
L — Batteries fully charged.
I d Low battery. Ready fresh batteries.
H
(flashes)
d
(flashes)
Shutter release disabled. Change
batteries.