There once was a time that, if a camera or flash used batteries at all, it was powered by one or more trusty 1.5 volt AA (LR6 in some parts of the world) cells. More and more though, equipment manufacturers seem to be converting to either proprietary, rechargeable lithium-ion batteries or else the new fangled CR123A cell. But while AA batteries were cheap and readily available, it's a bit harder to find good deals on quality CR123A batteries....
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