SolarPower is a just-for-fun app, you can prank your friends. Simply start the app, put your phone in a well lit place and watch your battery charge using the solar panel. The app uses the brightness sensors of the device, the stronger of the light, the faster it charges!NOTE: It is technically not possible to generate electricity and charge your battery. Never put it for a long time to the direct sunlight, because the high temperatures can damage your phone!