Fomito Godox PB820S 2000mAh External Camera Flash Power Source Battery Pack Kit for Nikon SB910, SB900, SB800, SB28, SB28DX, SB80DX-Green This professional Godox PB820S PB820 power pack is designed with external input ports (Which is suitable for Nikon,Yongnuo and Godox speedlite) and provides supply for continuous lights. Large-capacity lithium battery (11.1V / 2000mAH), it takes only one second to charge for Nikon SB900 flashes at the maximum power, supporting about 900 times of flashes. Optimized MCU circuit design, more efficient energy conversion and more flashes. With LED indicator: 4 LED power, one LED for charging status, and one for working status. Charge for both AC and car charger,with shoulder strap, convenient for you to take it anywhere.