This package is specifically designed for LG Aristo 2 ,Model LMX210MA from MetroPCS as we stated in our listing. There are many LG Aristo in the market, they all use different battery. If you do not have LG Aristo 2 LMX210MA , this package is not for you. You do not need a special back cover to use this battery ====================================================================== 1)2550mAh Excellent Replacement Li_ion Battery: * Brand: Unbranded/Generic . * High quality Li-Ion battery. * Battery Type: Lithium Ion. * Battery Capacity: 2550mAh . * Voltage: 3.85V. * 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. * Each battery comes with a special chip to protect your smart phone from over-heating, short-circuit, 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.)
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