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'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 conditionMore time to rock， talk， surf and sendSecurity guarantee: short-charge protection， anti-discharger protection                                                            Specifications            Battery type    Lithium-ion Batterty    <br>Capacity    1900mAh    <br>Output Voltage    5V    <br>Output Current    500mA    <br>Cycle Life    500times    <br>Standy Time    Up to 230 hours    <br>Talk Time    Up to 6 hours    <br>Intenet Use    Up to 5.5 hours on 3G<br>Up to 8 hours on Wi-Fi    <br>Audio Playback    Up to 30 hours    <br>Video Playback    Up to 8 hours    <br>Dimension    12.5 x 6.3 x 1.6cm / 4.92" x 2.36" x 0.59" (L x W x H)    <br>Weight    110g / 3.88oz    <br>Color    White    <br>Compatible with    iPhone 4/4S    <br>                                                            Package Includes            1 x 1900mAh Rechargeable External Battery Case for iPhone 4/4S White