Last month when I headed to Chicago's Lollapalooza music festival, I wouldn't have made it through without my Mophie Juice Pack Air. Part case and part external battery, the Mophie kept my iPhone charged and ready to go through the entire festival day, even though it was in near-constant use. And now, there's a Mophie Juice Pack Air for iPhone 4 users, too!
Check out the Mophie's specs after the jump.
The external battery/case is a thin and lightweight protective case that allows you to charge your iPhone even when you're not near an outlet. The case nearly doubles the battery life of your phone and is easily switched on and off, depending when your phone needs an energy boost. If the case is switched on, your phone will draw power from it, not its own battery. When the case is off, your phone runs from its own battery. New to the iPhone 4 case: a design that replicates your iPhone and integrated LED status lights showing you exactly how much power is left.
The new Mophie Juice Pack Air retails for $80 and comes with a one-year limited warranty.