If you need the flash to fire rapidly back to back shots then you shoud look at one of those high capacity belt backs and a cord to attach it to your flash ifrecycke time is gonna be an issue. All the sports photographers around her use them and sware by them.
style="BACKGROUND-COLOR: #000000"I for one use impact 2900mha batteries in my sunpack383 flash and they work good. it does take almost 10 to 11 saeconds between flashes for the power to rectcyvle and according to others I have spoken with it doesn't matter what kind of AA rechargeables i.e. mha or brand the recycle time is still an issue. If I don't use the flash often in a 2 week period I just top off the batteries in my charger and put them back in the flash.