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Author Message   Cooltouch Tinkerer Username: Cooltouch Post Number: 166 Registered: 01-2009 Rating: N/A Votes: 0 Posted on Tuesday, December 13, 2011 - 12:34 pm:    Hey Rick, Thanks for the follow-up. Yeah, I wasn't aware that the EF is not so sensitive to voltage. I know that's the case with some other manufacturers, like Pentax, but I've just been assuming that, since the F-1 and FTb are sensitive to the voltage difference, the EF would also be. So, I'll go ahead and pick up a couple of the Alkaline 625s and give it a shot. I guess the different discharge properties between the alkaline and the old mercury don't matter that much either, eh? One of the things I like about the zinc-air batteries is their discharge profile is virtually identical to the old mercury batteries.