You do not need a special back cover to use this battery This package is specifically designed for the cellphones we list here, if your cellphone is not in the list , then it's not for you. 1)7100mAh Excellent Replacement Li_ion Battery: * Brand: URS2GO . * High quality LiIon battery. * Battery Type: Lithium Ion. * Battery Capacity: 7100mAh . * Voltage: 3.8V. * This battery is internal battery with pipe line,it has an integrated microchip that prevents overcharging and lengthens battery life. * 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. * Each battery comes with a special chip to protect your smart phone from overheating, shortcircuit, over charging or over discharging. * Integrated microchip prevents overcharging and lengthens battery life. * When using the battery, please notice that use up all the power of battery for the first three times before charging, and then take a full charge, thus the battery can be reached the optimum effect of using.Please remember that its full performance and longevity is only achieved after 3 to 5 complete charge and discharge cycles. * Replace your existing smart phone battery with a stronger.(The battery operation time depends on conditions .such as: Transmitting power level, Signal (distance between the phone and the base station),Network parameters defined by the operator.) 2)Screwdriver Tool Kit: * Basic set of tools for minor DIY cell phone repairs. * All tools are included to efficiently replace Phone Batteries.