This 14.8V 4400mAh AC/DC lithium polymer battery is compatible with Westcott’s FJ400 strobe. It provides over 480+ full-power flashes on a single charge and is rated for 300 charge cycles. The removable lithium polymer battery provides both DC power for on-location freedom and AC trickle-charge performance when the state of charge is above 25%. This FJ400 Battery is both compact and lightweight at 1.5 lbs (.68 kg). It is quickly interchangeable and charges fully in just 2.5 hours and the rear battery level LED indicator lights provides real-time charge status. With the FJ400’s built-in Sleep Mode, you’ll conserve battery life between shots. The FJ400 is the first portable 400Ws AC/DC strobe with under a second recycle speed at full power that offers an impressive 480+ full-power flashes per charge. The lightweight FJ400 offers unrivaled performance with the most accurate color temperature throughout its entire 9-stop output range. Trigger the flash with the Westcott FJ-X2m Universal Wireless Trigger or Canon RT system. With an intuitive menu system and LCD color display, the FJ400 features Manual and TTL Flash Modes, High Speed Sync (HSS) up to 1/8000s, Freeze Sync up to 1/19000s, Continuous Capture up to 20 fps, Mask Function, Delay Function, Automatic Memory Recall, and much more.