For iPhone 3GS battery,accessories for iphone, 1.JNT-3GS 2.Voltage:3.7V USD interface 3.Capacity:2000mAh 4.Input Voltage:5.0 5.6V 5.Input Current:≥500mA 6.Output Voltage:5.0 5.6V 7.Output Current:≥500mAh 8.Charging time:50 250min 9.Portable power charging time:160 250min