Detailed Product Description 1.Extra battery for iphone 3g2.portable and fashional design..3.CE,FCC,RoHS...4.Capacity:4400mAh5.Size:100*62*10mmbattery for iphone 3gs,charger for iphone,phone charger,replacement battery for iphone 3g,battery for ipod,extra battery for iphone,extra battery for iphone Feature & Specification: Capacity: 5000 mAhSize:100×62×10mmOutput Voltage: DC 5.0VOutput current: 700mA maxSatefy quality control & Warranty policy:We choose grade "A"cells,protective ICs made in Japan or Taiwan and other highest quality raw materials.We conduct 16 or more tests on each stage of assembling process starting from every parts,work -in-progress,to final product.Any defective parts in progress are rejected.Protective circuit will prevent the backup battery from short-circuit,over-charging,over-discharging even under the most extreme condition.Quality Warranty Period:1year,but not including damaged ones because of the false actions against our user's manual.5000mah usb external mobile battery pack, support all cell phones, PDA, digital cameras and so on, 2 usb port.External Battery Pack: