battery power station for iPhone 4G 1,400 standby hours, 7hours ... :2300mAh 3.Fit for iPhone 4G Specification:1, battery power station for iPhone 4G2, Battery type:Li-ion3, Capacity:2300mAh4, Fit for ... on 3G network, d) 8 hourspower supply on Wi-Fi, e) 30 hours aduio playing, f) 8 hours video playing.