Compatibility: The Westcott FJ80 II USB-C backup battery is designed for FJ80 II Speedlights Easy Charging: It has a built-in USB-C port for convenient charging Long-Lasting: It offers over 500 full-power flashes per charge, which is perfect for long sessions and demanding shoots Design: Compact, lightweight, and designed for efficiency, this battery is an essential addition to your photography kit Capacity: The 11.1V battery has a high-performing 16.65Wh, 1500mAh capacity