The Nikon EN-EL18c Rechargeable Battery has a capacity of 2500mAh, an output of 10.8V, and 27Wh. This Rechargeable Li-ion Battery is used to power the D5, D4s and D4 Nikon D-SLR cameras. It can be charged using either the MH-26a or MH-26aAK Adapter Kit battery chargers. The EN-EL18c Rechargeable Lithium-ion Battery is also used with select Nikon cameras and Multi-Power Battery Packs, powering the cameras. This is the latest model version, a pro-spec and performance Lithium-Ion rechargeable battery with a high capacity of 2500 mAh (10.8V) for long operating life. It is for the Nikon D6, D5, D4s, D4 (and D810 & D850 etc with MB-D12 or MB-D18 Grip and BL-5 Battery Chamber Cover attached). The Nikon EN-EL18c Rechargeable Lithium-Ion Battery Pack replaces the previous model, the Nikon EN-EL18b.