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Edit: It turns out battery-powered heating in clothing actually is used on Mt. Everest: Hotronic makes battery-powered heated insoles that are used by Everest climbers, for example. Battery powered...
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Edit: It turns out battery-powered heating in clothing actually is used on Mt. Everest: Hotronic makes battery-powered heated insoles that are used by Everest climbers, for example. Battery powered...