COMPATIBILITY - Replacement for Nikon MH-33; Works with Nikon cameras that use ENEL18 batteries: Nikon D4, D4S, D5, D6, Z9, D850 (with adapters/grips) CHARGER SPECS - Charges two batteries sequentially; AC Input 100V-240V; Charger works with Nikon original batteries CHARGING OPTIONS & OVERCHARGE PROTECTION - Charges 1 battery at a time for a faster charge; Charger is protected with overcharge protection to increase safety INCLUDES - 1 dual charger for the Nikon EN-EL18 so you always have the power you need USA WARRANTY - All items include a 3-year manufacturer warranty from Wasabi Power and 100% US based customer support in Pomona, California This Wasabi Power dual battery charger replaces the Nikon MH-33 to fully charge the Nikon EN-EL18, EN-EL18a, EN-EL18b, EN-EL18c, and EN-EL18d batteries. It will charge two batteries sequentially (one after another) so that you have a fully charged battery ASAP. The MH-33a charges the Li-Ion batteries for the D4 and D4S cameras and can also be used with the MB-D12 or MB-D18 battery grips. AC Input: 100V-240V, 50/60Hz Output Power: 25-30VA Charging Current: 1.2A Compatible models: Nikon EN-EL18 / ENEL18 Nikon EN-EL18a / ENEL18a Nikon EN-EL18b / ENEL18b Nikon EN-EL18c / ENEL18c Nikon EN-EL18d / ENEL18d Nikon MB-D12 battery grip / MBD12 Nikon MB-D18 battery grip / MBD18 Replacement charger for: Nikon MH-33 Charger Compatible cameras: Nikon D4 Nikon D4S Nikon D5 Nikon D6 Nikon Z9