Nikon D750 DSLR Camera (Body Only) - Manual (Page 522)

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The movie footage or number of shots that can be recorded with
fully-charged batteries varies with the condition of the battery,
temperature, interval between shots, and the length of time
menus are displayed. In the case of AA batteries, capacity also
varies with make and storage conditions; some batteries can not
be used. Sample figures for the camera and optional MB-D16
multi-power battery pack are given below.
• Photographs, single-frame release mode (CIPA standard 1 )
One EN-EL15 battery (camera) : Approximately 1230 shots
One EN-EL15 battery (MB-D16) : Approximately 1230 shots
Six AA alkaline batteries (MB-D16) : Approximately 430 shots
• Photographs, continuous release mode (Nikon standard 2 )
One EN-EL15 battery (camera) : Approximately 4420 shots
One EN-EL15 battery (MB-D16) : Approximately 4420 shots
Six AA alkaline batteries (MB-D16) : Approximately 780 shots
• Movies 3
One EN-EL15 battery (camera) : Approximately 55 minutes of HD
footage
One EN-EL15 battery (MB-D16) : Approximately 55 minutes of HD
footage
Six AA alkaline batteries (MB-D16) : Approximately 20 minutes of HD
footage
Battery Life