Nikon D7100 - Manual (Page 271)

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U
Choose whether the battery in the camera or the batteries in the
battery pack are used first when an optional MB-D15 battery
pack is attached. Note that if the MB-D15 is powered by an
optional EH-5b AC adapter and EP-5B power connector, the AC
adapter will be used regardless of the option selected.
A s icon is displayed in the camera control panel when the
batteries in the MB-D15 are in use.
d13: Battery Order
G
button ➜ A Custom Settings menu
A The MB-D15 Battery Pack
The MB-D15 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-D15 as follows:
MB-D15 battery type display Battery type
$ EN-EL15 rechargeable Li-ion battery
w AA batteries