The Fotodiox v-mount battery is the perfect accessory for many of the Fotodiox Pro LED lights that have the v-mount battery option, such as the flapjack studio XL and factor line of LED light fixtures. By providing an alternate power source for these lights, this battery lets you shoot anywhere instead of being tethered to wall outlets as with most studio lights. This Fotodiox v-mount battery provides 130 watt hours of power, providing nearly 3.25 hours of Shooting time when using a Fotodiox Pro flapjack 1x1 LED (c-518asv) edge light. NOTE: the v-mount battery charger, sold separately, is required for Recharging the battery.