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I suspected as much, but didn't want to commit to it. :)

I would actually suspect most modern batteries would work fairly well; the issue back then wasn't so much the peak current but how quickly the battery recovered afterward and how long it could continue to deliver current with that usage model (most batteries being designed to produce a steady current over a longer time, whereas flash wants a high initial current and doesn't care much about how long the current can be sustained). Battery technology being much better these days, it's entirely possible that even ordinary zinc cells would do — although their lifespan would undoubtedly be fairly short.