Nikon D7000 - Manual (Page 241)

221
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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-D11 battery
pack is attached. Note that if the MB-D11 is powered by an
optional EH-5a 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-D11 are in use. The information display
shows the type of battery inserted in the MB-D11 as follows:
d14: Battery Order
G button
➜ A Custom Settings menu
Icon Battery type
$ EN-EL15 rechargeable Li-ion battery
w AA batteries