Pitched as a same-priced alternative to Mophie's Juice Pack Air, Belkin's Grip Power ($100) is a sleek glossy plastic battery case for the iPhone 5. With a 2000mAh cell -- considerably more power than the 1700mAh Air -- Grip Power promises to double the battery life of the iPhone 5, and is likely to actually achieve it. Top and side button protection are both included, along with a rubberized bumper-style frame that helps you grip the iPhone more…
