Mophie is now selling their updated Juice Pack Air battery case for the iPhone 4. The new Juice Pack Air promises to double your iPhone 4's battery life in a low-profile design. With a soft-touch coating and a two-tone metallic scheme, your iPhone 4 won't lose it's good looks while adding some protection along with it. The new juice Pack Air for iPhone 4 is available now for $79.95. Hit up the source link for more details.