You do not need a special back cover to use this battery This package is specifically designed for Samsung Galaxy S2, Model SGH-S959G from Straight Talk/NET10 as we stated in our listing. There are many Samsung Galaxy S II in the market, they all use different batteries. If you do not have Samsung Galaxy S2, Model SGH-S959G, this package is not for you. 100% Brand New. 2550mAh Rechargeable Li_ion Battery: * High quality Li-Ion battery. * Battery Type: Lithium Ion. * Battery Capacity: 2550 mAh. * Voltage: 3.7V. * The best spare battery for your phone. * Best Replacement for the original battery with comparable standby and talk time . * Our battery is sent out with little or no power, so please charge it for about 6 - 12 hours before using. * Keep an extra battery on hand for extend standby and talk times. * Integrated microchip prevents overcharging and lengthens battery life. Compatible models: Samsung Galaxy S II , S959G (Straight Talk/TracFone/NET10)
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