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>>239605 Best option: MR9 adapter from CRIS camera http://criscam.com/ Lets you use an easy-to-find silver battery. Silvers don't last as long as the old mercuries did, but they still last long enough that replacing the battery is something you have to worry about annually rather than weekly. The MR9 is reusable, so after the initial $20 or so for the adapter, you only have to pay $5 for replacement batteries.
Second best option: Wein zinc-air cells. They die a hell of a lot more quickly, but they're cheaper in the short term (though the MR9 pays for itself after a few months) and are a lot easier to find (I know of two stores in the Buffalo area that sell 'em, but I had to order the MR9 directly from CRIS online)
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