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Author Message   Charlie Tinkerer Username: Charlie Post Number: 194 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Wednesday, February 04, 2009 - 07:15 am:    #675 hearing aid batteries are 1.4 volt, (zinc/air)are usually about $1 each and sold in most pharmacies. They are smaller than the original mercury batteries and will require some shimming to fit and make contact properly.