This battery has a capacity of 2000mAh, which is an additional 350mAh over the stock battery. That can provide up to 11.8 hours talk time, keeping your Samsung Galaxy S2 going for longer. As this battery is bigger in capacity than the standard one, it also has to be bigger in size. To accommodate this, the battery comes with a specially built replacement back cover that houses the battery, while also offering additional protection to the back of your phone from scratches and scrapes. The battery is approximately 1.5mm thicker than the standard battery. As a result the camera will now sit flush with the phone.