Double your battery life! Extend your talk time, browse time, stop running out of battery before the end of the day! This battery has an integrated chip that prevents overcharging and extends battery life to up to twice your factory battery! Warm Suggestion: For the long-run usage and stable performance of the battery, we highly suggest you charge the battery in case of low power Features: 1. High quality Li-Ion battery 2. Best replacement for the original battery with comparable standby and talk time 3. Keep an extra battery on hand for extend standby and talk times 4. Integrated microchip prevents overcharging and lengthens battery life 5. The best replacement spare battery for your phone 6. Includes battery cover for extended thick battery (The replacement battery is twice as thick as the original one, so the assorted battery cover is provided and should be used together with replacement.) 7. Easy to carry, install and remove 8. Our battery is sent out with little or no power, so please charge it for about 4 - 6 hours before using 9. 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 10. Compatible with: HTC EVO 4G (Not for HTC EVO Shift 4G) Package Contents: 1x EXTENDED BATTERY FOR HTC EVO 4G WITH BACK COVER