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Author Message   Charlie Tinkerer Username: Charlie Post Number: 136 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, February 17, 2008 - 07:20 pm:    My understanding is that zinc/air hearing aid batteries have a very flat voltage, same as the older mercury batteries throughout their life. I have used them in Olympus and Canonet cameras with no problems. However I have not sen the #675 (1.4 volt) ones advertised in the Sunday pharmacy ads. Does anyone kno if they're being discontinued?