Hi
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It appears that AAA Lithium batteries are on the market. They are showing as being available at least one US retailer, http://store.batteryspecialists.com/l92bp4.html I did try to find out more information on the Energizer site at http://www.energizer.com/default.asp with out luck. I did search for the battery number as given on the retailer's site at Energizer without luck .
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Looks promising but unless someone has them in their hot little hands ....
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Regards<br>
Andrew