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The Dexim Super-Juice Power Case is not only protection for your iPhone 4, but also an extra battery. With the iPhone 4 battery upgrade in the latest refresh, Apple gave us a lot of juice for our devices. Seeing how the 3GS it's predecessors struggled in battery life, people turned to external battery cases like the Mophie Juice Pack Air. The iPhone 4's battery is pretty damn good, it can last almost an entire day with heavy use. But if you find yourself using your device a little more than others, going on a trip, plane ride, low on battery, this case is a good thing to keep around. Sometime I find myself away from home for a whole day. I do not always like using my car charger, leaving my phone in the car, or bringing my home charger. Keep this case on my phone, in my backpack, pocket, or car helps me out on long days. If you are going out for the night and don't know when you'll be back, I'm sure you'll run out of juice. Dexim promises an extra 6 hours of talk time, 10 hours of video/game, and 40 more hours of listening to music. This is all thanks to the 2000mAh battery that is inside the back of the case. The case can be charged through the micro USB that is included in the box. You can plug it into the computer or to your iPhone's A/C adapter via USB. This will charge the case and the phone at the same time, charging the phone as a priority. The back of the case offers a few features as well. You can press the button on the back to check how much battery the case ...