iPhone battery dying too soon during the day? That’s a problem I hear from many owners. In all fairness to Apple, the only reason that this is an issue is because the phone is such a useful tool. Besides being a phone, it’s an email client, game player, music and video player.... the list goes on and on. Bottom line, people use their iPhone so much, the battery inevitably gets drained faster.

Enter the Mophie Juice Pack Air. For about $99 this slip on case/battery extends the life of your 3G iPhone by up to 4 hours of additional talk time, 20 hours of music, or 6 hours of video watching. The case has a little switch on the bottom that toggles it on or off (conserving battery life) and a blue LED indicator on the back that tells you how much juice is left. Does it work? Yes. Is it worth it? If your iPhone is dying half way through the day, a resounding yes!