Capable of adding up to 8 hours of talk time and 7 hours of web, the Mophie Juice Pack is a must have accessory for any iPhone owner. It doesn t only extend battery life though, as it is also a very solid case that actually acts to enhance audio quality by redirecting sound from the bottom of the iPhone to the front. On a personal note, I love the Mophie Juice Pack. I m always on the road traveling to conferences and meetings so I don t always have time to stop and charge my iPhone. By using the Juice Pack though, I can charge it on the fly. That s one less thing to worry about.