I am a professional photographer and put the cells in my flash units and associated power packs a. I create in combination with the cells and the power packs of 8 Nikon flashes in series (continuous fire) ca 700 images under continuous stress and a lot of continuous fire, of course, supported by the power pack. With batteries, less power, more weight, because you have to take a lot of spare when working with batteries. Then come there are the temperatures like last winter added and the batteries goodbye already with a few pictures, hold the Energizer and hold and hold and ...............
