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AR15.COM
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1/6/2007 9:51:51 PM EDT
I've got a couple Surefires, and have been using PentagonLight CR123As in them.
They claim to have "up to a 10 year shelf life", but I've had some with runtime of about 15 minutes or so lately. The batteries from the box I have open now are marked "AUG 05", so I dont imagine they are more than 6 months or so old.

What could vary the shelf life?
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