... built-in battery is about 6-10 hours. Computer or AC adapter charge for built-in is about 2-3 hours ... . Adapter 5V / 1000 mA1,Intellectual charging function precharge,constant current charge, ... , IPOD,DV etc digital products.9,Charging time(with proper AC adapter) 2~3 hours10,Working time(battery is full) 3~5 ...