aigo launches the aiPower i616 that claimes to be the best iPhone 4 battery case ever. The aiPower i616 is a lightweight protective and ultra-thin case with built-in rechargeable battery pack. One of the main features of the case is its integrated mini USB cable so you no longer need a separate cable for charging and sync.
The aiPower i616 packs a 1500mAh battery providing additional 300 hours of standby time, 7 hours of talk time, 10 hours of Internet, 10 hours of video and 40 hours of audio playback time.
