2 x 2900mAh battery + US Wall USB Charger For Samsung Galaxy S 3 III SGH-I747 1. Best replacement for the original battery with comparable standby and talk time 2. Keep an extra battery on hand for extend standby and talk times 3. Integrated microchip prevents overcharging and lengthens battery life 4. Our battery is sent out with little or no power, so please charge it for about 4 - 6 hours before using 5. 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