Nikon D750 DSLR Camera (Body Only) - Manual (Page 371)

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To ensure that the camera functions as expected when the
optional MB-D16 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 batteries.
d11: MB-D16 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.
H d
Low battery. Ready fresh batteries.
H
(flashes)
d
(flashes)
Shutter release disabled. Change
batteries.