The PowerVault DSLR External Battery Pack for Nikon NE-EL15 from Jupio is a portable 28Wh power supply for Nikon DSLRs and video cameras that use an NE-EL15 battery. It allows extended operation of the camera when stopping to change batteries is not an option. The included battery power cord fits into the camera body in place of the original battery to supply power from the pack. The PowerVault also features a USB output suitable for charging most smartphones and tablets.