First, I'd like to say what I did not like the floor S3. It was a question of very good for a smartphone of this size, but nevertheless with the very flat back, making the phone tends to slip a bit short sized battery and the slightly unfortunate shape of the hand. After I bought the Extended Battery Kit, I was skeptical whether the device would not be too thick and too heavy. These doubts are, however, quickly disappeared; the device is now though a little thicker, but at the same time the back is now slightly bulbous, so it's better in the hand and one-handed operation is no longer tends to slip out of his hand; nice side effect is that the lens of the camera is no longer projects from the housing and is thus better protected. As for the form, the S3 is now reminiscent of a large version of the iPhone 3G / S. The higher weight is in my opinion not disturbing. On the contrary, it helps that the unit is now better in the hand. Let us now but the main reason why you will likely set this kit / risen: The battery life With the standard battery I always had a duration of 1.5 to 2 days with Screen times of around 4 to 6 hours. With the new battery I have now, after a day use with 2 hours screen time, yet almost 80% battery with bunk kernel and Stock Rome. I am more than satisfied with the kit, even if I paid 40 for it. If the price not fallen, there would have been only 4 stars because it is 40 but set a little too high. I also like that Samsung has left here the customer's decision even if he wants to, or long battery life and for a little "kurvigeres" device with Power Battery a sleek smartphone for normal to little use. I personally do not find it annoying that the equipment has become larger and heavier, because it is better in my opinion by the hand. In addition, it still fits despite the growing dimensions in the Suncase. The offered battery life should now bring for power users and two more days of battery life with it.