If iKit's Nu Charge Battery Case for iPhone 4 ($65) looks familiar, there's a reason: it's almost identical to offGRID from Incipio. We don't know which is the original, but they're certainly difficult to tell apart unless you look at the specific details, including iKit's 1400mAh battery (versus 1450 in offGRID), the slightly squared-off edges (versus Incipio's rounder ones), and the soft-touch rubber matte finish (versus offGRID's glossy one). Both…
