Hi, I got a Olympus IS-50 SLR(35mm) camera, and it comes with a pair of Li battery of size 123A. Now these batteries are already low and I don't want to shell out bucks in replacing batteries for each roll. So, I did a quick search for making a battery pack and got some good articles in groups.google.com. But, everyone talks about using NiCD or Lead acid battery. Can't I use 4 NiMH batteries to supply the required 6V? Does anyone know any alternative? Thanks roror