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Powering Your Gadgets in the Wilderness

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In discussions with other gadgets users, often the problem of getting extra power comes up. Particularly when you are away from power outlets for prolonged time - e.g. on the nature hike. Two "miracle solutions" always inevitably come up - using muscle power ("wind-up chargers") or using solar power. On first look, they appear to be perfect. However, they have very significant shortcomings in reality: