For Motorola Droid X / X2 High Capacity 3500mAh Extended Battery w/ Back Door Our replacement battery was specially designed for your phone with standard voltage, capacity, compatibility and safety to deliver reliable and optimal performance . Capacity: 3500mAh Battery and back door will create increase in size of the phone that may not fit with skin case, leather case, or holster. Package include: 1 Battery, 1 Black Back Door