... of high capacity is 4 to 6 times of general mobile phone battery, MP3 / MP4 6 to 15 times, digital camera 4 to ... to decide, calculation formula is: [mobile power supply capacity] 5000 / X [you electric battery capacity] = y [times]) enough for mobile phones, MP3, MP4, PDA ... disposable batteries or rechargeable batteries, etc.; Suit to Go out for long distance McGregor, sail a boat, on a business trip ...