The energy transformation from solar to electricity is rather slow and the solar charging speed is subject to sunlight intensity and panel conversion rate. In daily life, we highly recommend charge it via wall outlet. Solar charging is supplemental, please do not rely on it for full charge.Fully charging by outlet takes approximately 10 hours. Do not charge it all day nor over voltage. For safety, DO NOT leave the power bank charging in car in case of high temperature and avoid crashing.
Do not make charge while charging itself. 300,000mAh is a theoretical capacity from the company.You can charge 3-6 times(depending on your phones conversion rate) at one go. We guarantee 3-4 times of charging capability. Package Included: 15 x Dual USB Solar Power Charger (with a compass) 15 x USB Charger Cable 15 x Package box. (No service on Weekend and public holidays). All return products should be in brand new state with all accessories included. The item "LOT 15 300000mAh Dual USB Portable Solar Battery Charger Power Bank, Blue" is in sale since Friday, February 2, 2018. This item is in the category "Cell Phones & Accessories\Cell Phone Accessories\Chargers & Cradles". The seller is "greenenv" and is located in Pasadena, Texas. This item can be shipped to United States, Canada.