Mophie has unveiled its second iPhone 5-compatible charging case: the Juice Pack Air. The Air will retail for $99. Black models will ship in 7 to 10 business days, while the red and white flavors will begin shipping on March 22. The Juice Pack Air includes a 1700mAh battery. That is 200mAh more of juice compared to Mophie’s recently released Juice Pack Helium case. Here are the benefits, according to Mophie, over an iPhone 5 without a Juice Pack Air: Talk Time Up to additional 8 hours on 3G Internet Use Up to additional 8 hours on 3G