EC TECHNOLOGY 2200 mAh New design with a stand-by Rechargeable, Portable Battery Juice Black protective Case and Extended Battery for iphone4 / iphone4s -Retail Packaging Extended battery juice case for iPhone 4 / 4S- 2200 mAh Extends Battery Power: 7 hrs talk time/ 11 hrs Video Playback/46 Hours Music Playback/380 hrs standby time Great as a back-up, or as a permanent power case solution ; Auto power Output Control Sleek, Low-Profile design ; Rechargeable up to 500 times - Charges through USB Cable 6 month product replacement warranty