In case you've been living under a rock for the past few years, backup battery cases for the iPhone are a much wanted accessory any power user appreciates and trusts with his or her life. We at Gadgetmac reviewed more than a handful already and we think it's Incipio's turn to hand over its iPhone 4 battery case for testing. The offGRID is not a bad name to start out, packing a 1450mAh battery pack under the bonnet, that's hood in case you aren't British. Find out exactly how well the offGRID handles the test of our vigorous reviewing and standards after the cut!