Compatible with:  HTC EVO Design 4G ( Sprint/Boost Mobile ) 2700mAh Li_ion Battery: Quantity: 1 * Brand : Unbranded/Generic * Voltage: 3.7V. * Battery Capacity: 2700mAh * High quality Li-Ion battery. * Battery Type: Lithium Ion. * This battery has the same dimension as your stock battery, you do not need a special back cover to use it. * Keep an extra battery on hand for extend standby and talk times. * Integrated microchip prevents overcharging and lengthens battery life. * The best replacement spare battery for your phone. * Our battery is sent out with little or no power, so please charge it for about 6 - 12 hours before using. * 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. * This Battery could also be charged in the phone directly thru the cell phone charger .