3150mAh Battery+Universal Charger for Samsung Galaxy S II * This package is specifically designed for Samsung Galaxy S II Model SGH-T989 from   T-Mobile as we stated in our listing. * There're many Samsung Galaxy S II in the market, they all use different Screen Protector. * If you do not have Samsung Galaxy S II SGH-T989 , this package is not for you. Battery * Quantity: 2 * Brand:Sporting Persistence * Excellent quality battery for Samsung Galaxy S II SGH-T989 * This battery has an integrated that prevents overcharging and lengthens battery life. * Cell type: Lithium Ion. * Voltage: 3.8V.     Capacity :3150mAh * The battery operation time depends depends on conditions suchas:Transmitting power level, Signal (distance between the phone and the base station),Network parameters base the operator. Universal Charger * Quantity: 1 * To Charge battery for Samsung Galaxy S II allow the 2 metal pins on the vcharger to touch the 1st and the 3rd contacts of battery. * For other batteries, it's not necessarily to be the 1st and 3rd though, please refer to the user manual. * You should see the LED light turn blue on the charger, that means the contacts has been firmly connected. * Now you could plug in the charger with the battery into a power socket. * The LED Light will turn Red when charging the battery, turn blue to indicate the battery is fully charged.      Package Content:   * 3150mAh Battery x 2 * Universal Charger x 1 * ( Cellphone not included )     Compatible with: Samsung Galaxy S II SGH-T989 (T-Mobile)     *  This battery has the same dimension as your stock battery,    you do not need  a special back cover to use it