We've talked about Mophie's Juice Pack rechargeable external battery cases for iPhone before; we did a review of an early model and have given you the news of the Juice Pack Plus for iPhone 4. We finally got our hands on a Juice Pack Air for iPhone 4 for review purposes, so now it's time to give you the skinny on how this battery pack works with the latest incarnation of the iPhone.
Design and size
Like the previous version for earlier iPhones, the Juice Pack Air for iPhone 4 comes with a USB-to-micro USB cable that is used for syncing and charg
