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Hand Warmers for batteries
Kevin mentioned using the hand warmers where you mix those two chemicals
together. The chemical kind I have are one shot deals, but they last a few
hours if I remember. I also have on hand reusable hand warmers. they don't
last long, but they are rechargeable by just boiling them in water for 5
minutes. I have several on hand and have used them hundreds of times.
Perhaps their heat will be sufficient if kept wrapped for an hour or two?
George