Incase’s Power Slider combines a protective hard case with a 1330mAh battery for your iPhone 3G. It charges via the included USB cable and syncs to iTunes while in the case. The two-piece case slides on and covers the entire back of the phone, as well as all the edges. Cutouts leave all of the buttons easily accessible. While we like the two-in-one design, the trade-off is a case that can feel bulky at times, although it only adds 2.5 ounces to the weight of your iPhone.
The Power Slider gives users five hours of additional 3G talk-time and seven hours of video playback.
Battery integrated into full protective case. Allows iTunes syncing. LED power gauge.
Can feel a bit bulky in your pocket.