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Solar Power Bank User Manual: What is a power bank? How to use power bank. How to charge power bank. Solar charger user guide? Power bank operating guide.Durecopow 20000mAh Solar Charger for Cell Phone iPhone, Portable Solar Power Bank with Dual 5V USB Ports, 2 LED Light Flashlight, Compass Battery Pack for To recharge your Power Bank plug the included micro USB cable into any USB power source. (wall charger, car charger, etc.) until the LED light turns solid red.