You'll never have to track down an outlet in the middle of the day to charge your iPhone 5 or 5s when you have a mophie Juice Pack Air Battery Case. This case both protects your phone from bumps and drops and provides you with up to 100% extra battery life through the 1700mAh capacity battery. The slim design of the Juice Pack Air is lightweight so that you can handle it easily and carry it in your pocket all day.