Kastar Battery Utra-high Capacity. Use high quality Japanese Cells for longer battery life with no Memory Effect. | Kastar Dual Fast Charger, wide range compatibility, it can charge for batteries with 6.8V-16.8V of any capacity. Control MCU can automatically identify the voltage of the battery, going intelligent charge when being charging, and prevent overcharge. | Intelligent Dual Fast charger LCD displays charging status, battery capacity, it can charge two batteries at the same time, change different plate, suitable for most of digital batteries. | Charging type is CC/CV with well reliability and high efficiency, with the function of pre-charging and li-ion battery 0V activation which can effectively extend battery life. | Compatible with: Nikon EN-EL18b EN-EL18a EN-EL18 MH-26 MH-26a and Nikon D4, Nikon D4S, Nikon D5, Nikon D6, Nikon D800 D800E D810 D810A Battery Grip MB-D12 (Note: Need a extra BL-5 battery cover), Nikon D500 Battery Grip MB-D17 (Note: Need a extra BL-5 battery cover), Nikon D850 Battery Grip MB-D18 (Note: Need a extra BL-5 battery cover)