Nikon D750 DSLR Camera (Body Only) - Manual (Page 372)

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Choose whether the battery in the camera or the batteries in the
battery pack are used first when an optional MB-D16 battery
pack is attached. Note that if the MB-D16 is powered by an
optional AC adapter and power connector, the AC adapter will
be used regardless of the option selected.
d12: Battery Order
G button
➜
A Custom Settings menu
A The MB-D16 Battery Pack
The MB-D16 takes one EN-EL15 rechargeable Li-ion battery or six AA
alkaline, Ni-MH, or lithium batteries (an EN-EL15 is supplied with the
camera; AA batteries are available separately).
The information display shows the type of
battery inserted in the MB-D16 as follows:
MB-D16 battery
type display
Battery type
$
EN-EL15 rechargeable
Li-ion battery
w
LR6 alkaline AA batteries
o
HR6 Ni-MH AA batteries
p
FR6 lithium AA batteries