Seidio Innocell 3500mAh Extended Life Battery for HTC G2 - Dark Gray Adds 0.7cm to your HTC G2 and comes with a dark grey replacement door to accommodate the larger size of the battery Capacity: 3500mAh To obtain the full capacity of your battery, leave the battery/your phone on the charger for an additional 2-3 hours after the charging indicator turns green or the battery status shows full. For use with: HTC G2