We recently mentioned the ego Hybrid Series USB flash drive case for the Galaxy S III and now we have word of another GSIII case. And honestly speaking, this one will probably be more useful and more welcomed. It looks like the folks at Mophie were recently showing off an upcoming battery case for the Galaxy S III. Yup, a Galaxy S III Juice Pack from Mophie. That being said, aside from the brief look that came courtesy of Engadget, the details were scarce. The details we have seen include that the GSIII Juice Pack will “double the battery life” and that it should be available sometime towards the end of October of beginning of November.