The MB-D18 Multi Battery Power Pack can be powered either by six AA batteries (Alkaline or Ni-MH or Lithium), EN-EL15 or EN-EL18b rechargeable Li-ion batteries. To use the MB-D18 with AA batteries, use the MS-D12 AA Battery Holder. When using EN-EL15 batteries to power the MB-D18, use the MS-D12EN Battery Holder. When using an EN-EL18b battery to power the MB-D18, use the BL-5 battery chamber cover.
Box IncludesBattery Grip
Nikon MB-D18 Battery Grip for D850 DSLR - 27188
Nikon Deluxe Camera Accessory Case - Gadget Bag
Nikon EN-EL15b Rechargeable Li-ion Battery