... the electric battery capacity to decide, calculation formula is: [mobile power supply capacity] 5000 / X [you electric battery capacity] = ... , MP3, MP4, PDA, game (PSP), digital camera, outdoor flashlight, head lamp, night fish lamp, camp lamp, tents lamp and ... for all appliances. Specification:Battery capacity: 5000 ma/hSolar power:0.7W *200MAPower kernel: polymer lithium ion batteryOutput voltage: ...