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Author Message   Charlie Tinkerer Username: Charlie Post Number: 157 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Tuesday, April 22, 2008 - 07:36 am:    #675 zinc/air hearing aid batteries are less than $! each, put out 1.4 volts and work well in most applications as a subsstitute for mercury batteries.