If youre planning on a long day or night of shooting with your flashgun be it an interfit strobies one eighty or another brand then you might want to pack one of these the 4500mah battery is capable of powering up to 900 full power flashes of a 180ws lamp and recycling in 05 to 22 seconds the proflash battery pack is a solid investment and a solid piece of kit connecting cables are available separately for canon metz sony and nikon flashguns as well as the interfit strobie one e