Fastest Delivery is of course Amazon. For my Galaxy S2, I still like to use in addition, a stronger battery was very desirable. So I had to resort to the original Samsung spare part. I can notice a significantly longer battery life. Visually, the difference may not be noticeable. The rear panel is now continuously plan. A matching cover, which I like to use as impact protection, I have found. Unlike the rigid cases, the silicone cover are somewhat elastic, so that they fit perfectly. A clear recommendation.
