MiLi Power Spring 4 (HI-C23)
The worldwide highest capacity external battery for iPhone

Capacity:             1600mAh /2000mAh     
Input:                    DC5V/500mA
Charging time:    4 hours
Standby time:      Up to 360 hours
Talk time:             Up to 6hours on 3G
                               Up to 13.3hours on 2G
Internet Use:        Up to 6 hours on 3G
                               Up to 10.6 hours on Wi-Fi
Audio play:            Up to 36hours
Video play:            Up to 10.6 hours
Dimension:           124(L)X65(D)X18(T)mm