d13 MB-D11 Battery Type
Explanation: This menu is relevant only when you use the optional grip MB-D11 that can take additional batteries.
In this case you can specify the type of battery in the MB-D11 here to get more accurate information about the battery status.
Tips: Ignore this menu if you do not use an MB-D11. Otherwise enter your type of batteries here if you should use other than Nikon‘s standard batteries.