Nikon MB-D17 Multi Battery Power Pack/Grip for D500 MB-D17 is a Multi-Power Battery Pack for the D500 Supplied with: MS-D12EN Li-ion Rechargeable Battery Holder, MS-D12 AA Battery Holder, Holder Case, Contact Cap, User's Manual and Waranty MB-D17 can be powered by eight AA batteries or by a single EN-EL 15 or EN-EL 18a Lithium Ion battery Features a Shutter release button and Fn button for ease in vertical shooting