I really like the metz 60 series strobes. I have about 15 units which I string together and blast through diffusion which gives me a wonderful, kind-of portable, very powerful fill/key light. I'm shooting 5x7, 100asa film and fstops like f16.5-f22.5 so I need the power. Recently I noticed that I need fresh batteries but upon pricing them out I became determined to come up with an alternative to the $50 Sonneschein a506/4.3 k. An internet search led me to a distributer that sells a 6 volt called the UB645 he claims customers have used as a substitute. This battery costs $10. The contacts are tabs which need to be pushed down inorder to fit. I'd love to hear from anyone who's gone down this route. But even more intriguing is the prospect of buying a 30 or 40 amp/hour 6volt drycell with bolt and nut terminals and a pair of leads going to each battery pack. The contacts in the pack are spring loaded and hang down low enough to grap with alligator clips. Can anyone think of a reason why this won't work?