Just like Juice Pack Helium, Juice Pack Air arrives at a battery capacity that’s on the lower end of what rival iPhone 5 battery cases will deliver: 1700mAh, up from 1500mAh in Helium. On paper, Air has 118% of the iPhone 5’s 1440mAh capacity, but due to the inefficiency of transferring energy from one battery to another, users shouldn’t expect to fully top off a discharged iPhone 5 and still have a little power left to spare. In…
