Most of us carry multiple knives, fire-making tools, batteries for lights, etc. I don't understand the big deal about carrying extra set of lithiums, especially for a potentially lifr-saving device. Maybe I'm naive, but wouldn't using it as intended be the best practice?
It makes sense to achieve compatibility among all your battery powered gadgets, which these days would include at least flashlights and probably a GPS. I feed AAAs to my lights and GPS, so a SPOT would fit right in. Lithiums are a no brainer for significant, extended use - they are dependable, lighter, worker better in the cold, and do not leak. With their terrific energy density, they are actually cheaper in use than all but the cheapest alkalines.
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