iPhone 5S 5 Battery Case, Rechargeable Portable 2500mAh Backup Power Bank External Protective Charger Case For iPhone 5S / 5, Full Body Protection,LED Battery Level Indicator(Black) Capacity: 2500mAh for iphone 5/5s power backup conveniently; (Take a breath) Ergonomic, form-fitting,fully protective impact-resistant case-and-battery in one for iPhone; Built-in rechargeable battery with 2500mAh capacity doubles the battery life. Unique design for acoustic sound enhancement. 4 LED Light Battery Status Indicator at the bottom of the frame. Smart battery technology actually instructs the Iphone to drain out the External Battery Case. When you're done with the External Battery Case, you can pull it off and still have a fully charged iphone.