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How does a portable solar power bank work? see here! A solar power bank uses the sun to charge itself instead of electricity. Then the accumulated power is fed into the rechargeable batteries, which will hold that power until need it. Environment Friendly: Charging the phone through a solar power bank saves energy.#solar #powerbank #solarpower #battery #solarenergy #winwin #factory #export | Win-Win Lighting Co., Ltd

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