Nikon MB-D18 Battery Grip for Nikon D850
Nikon MB-D18 Battery Grip for Nikon D850 DSLR
To use the MB-D18 with AA batteries, use the supplied MS-D12 AA Battery Holder. When using EN-EL15(b) batteries to power the MB-D18, use the supplied MS-D12EN Battery Holder. When using an EN-EL18b battery to power the MB-D18, use the optional BL-5 battery chamber cover.