Nikon SD-9 High Performance Battery Pack

The Nikon SD-9 Battery Pack is used to greatly increase the number of flash firings of the SB-900, SB-910 and SB-5000 Speedlights, and also shortens recycling time and increases flash capacity. The SD-9 is an external power source. It can hold up to two sets of four R6/AA-size batteries, ensuring a stable power supply for the SB-900, greatly increasing the number of flashes, and reducing recycling time.