Replacing your battery is one of the best ways of backing up your ?camera in every photography or videography. The Hahnel Nikon EN-EL9a Li-Ion Battery is a light and compact battery used as a spare power for select Nikon cameras. It is used as a replacement battery for Nikon EN-EL9a with 1080 mAh capacity, 7.4 Voltage output, and 8.0 Watt hour Power.