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The Westcott FJ400 Strobe 400Ws is powered by an AC-DC battery and has a recycle time of only 0.9 seconds at full power. The 14.8V battery has a capacity of 4400mAh. A full battery is good for at least 480 flashes at full power. The LED indicators show the remaining power. When you get started in the studio, you can power the FJ400 with the supplied power cable.