5star America External battery Power
Very useful product for those who doesnt what the added girth of other extended batteries&cases. This battery adds up to 9hrs of additional talk time to your s3. This product is extremely thin measuring at 7.9mm and comfortably fits into the majority of jeans pockets.
If you dont mind carrying a spare battery about the size of a smartphone in your pocket then this product is for you.
User opinions are welcome also product comparisons.