The Mophie Juice Pack Air is one of the more notable battery cases out there since the iPhone 3G/S. Mophie's Juice Pack Air battery cases have made a big impression on the iPhone user community over the years and now the Juice Pack Air comes to the iPhone 4 looking better than ever. I've had the chance to test out a few battery cases for the iPhone 4 in the past and some were great while other needed more work. So today, the Mophie Juice Pack Air has officially won me over as the best battery case yet. Catch the full review after the break!