Here is a smartphone power bank that you can charge with sunlight or a hand crank mechanism. The AYTECH Hand Crank Solar Phone Charger has a 10,000mAh battery and dual USB charging ports. It also has a torchlight to get you out of trouble in the dark.
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This power bank is waterproof and shockproof. It can be charged in about 5 hours using its hand crank. You can find out more about it here.
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