Solar energy board: 5.5V/80mA High capacity build ing Ni-MH battery: 1350mAh Output voltage: 5.0-6.0V Output current: 350-800mA Charging time: about 60 minutes(the time is a little different for different mobile phone) To charge the build in battery in the charger using solar energy: 10-15 hours. To charge the build in battery in the charger using computer or AC adapter: about 4.5 hours. The purple led work time when the build in battery is full: 142 hours