Power keyless entry devices, garage openers, remotes, calculators, and medical equipment with this 2-pack of Energizer A23 12V Miniature Alkaline Batteries. Each cell features a typical capacity of 55mAh, and is designed for applications that may require quick, powerful electrical pulses.
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Its priced just right, for micro 12 volt batteries.....
I know these things don't sell a lot, but B&H ought to keep a fresher supply... the ones I got only have about a year before they expire... which is likely to come before I need to use them !