Battery is the source of power for iPhone. Therefore， if the battery runs out of power quickly， it really casts a damp over users. However， keeping an extra battery enables you to enjoy endless pleasure with your iPhone and this external battery would be your best choice. The battery bears the properties of high capacity and dependable performance. It is durable， reliable and lightweight to carry， so it is worthy of your ordering. With this， you can keep contact with your friends and family anytime and anywhere. It won芒鈧劉t let you down.                                    Features            Mini design， fashion， energy-supply for business and outdoor activitiesHigh quality replacement batteryIt is made of high quality and durable materialLightweight， compact and easy to carryPortable and easy to useThe battery is in good working condition More time to rock， talk， surf and send.Security guarantee: short-charge protection， anti-discharge protection                                                            Specifications            Battery type    Lithium-ion battery     <br>Capacity    1900mAh    <br>Input    5V 500mA     <br>Output    5V 500mA max     <br>Charge time    4 hours    <br>Standy Time    &gt;450h    <br>Talk Time    &gt;7.5h    <br>Surfing    &gt;6h    <br>Wi-fi    &gt;13.5h    <br>Audio    &gt;45h    <br>Video    &gt;15h    <br>Dimension    12.5 x 6 x 1.5cm / 4.92\" x 2.36\" x 0.59\"(L x W x H)    <br>Weight    91g / 3.21oz     <br>Color    White    <br>Compatible with    iPhone 4/4S     <br>                                                            Package Includes            1 x 1900mAh External Battery Charger Case for iPhone 4/4S White