At 2 mW, you'd have to walk for over 1000 hours to generate the energy held in 1 AA battery. Rather than strapping a wonky device to my knee, I'd rather just carry a spare battery.
Related, my bug out bag doesn't contain a hand-crank radio or flashlight. It has a couple packs of AAs, which are much lighter than the food to replace the energy I'd expend cranking. They'll last me at least a few weeks. If civilization can't reestablish itself in that time, I'm probably fucked, regardless of electricity.
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