 Motorola claims that this equates to 20% on the Razr HD and 50% longer battery life on the Razr HD Maxx.Other critical reviews have noted the durability and rugged feel when describing the DuPont Kevlar backing.Additional durability is touted with a Corning Gorilla Glass display claiming to minimize scratches and an internal water-repellent nano-coating to resist liquids from affecting components.