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Author Message   Barnabyhairwax Tinkerer Username: Barnabyhairwax Post Number: 1 Registered: 11-2006 Rating: N/A Votes: 0 Posted on Monday, December 04, 2006 - 04:34 pm:    I use a 675 zinc air hearing aid battery. a little bit of plastic can be used to make a spacer around the smaller battery to hold it in. The discharge rate of zinc air batteries is comparable to the mercury battery, apparently.