The gang over at mophie, a company that makes a variety of power products for mobile devices, was kind enough to loan us a juice pack air for the iPhone 4. For those unfamiliar, the juice pack is a slide-on case that packs an extra 1500mAh battery for those times when power is at a premium. Although the case does add a fair amount of weight and depth to your iPhone, it also nearly doubles the battery life. We took the case with us when traveling to several events — where we were using our jailbroken iPhone 4 to tether via Wi-Fi — and the amount of time the juice air pack allowed us to use our handset without the need for a wall outlet was truly impressive. When the case is fully charged, activating its battery can almost completely replenish the battery of your iPhone 4. This allows you to use your device until the iPhone 4’s original charge is spent and for two hours while the case recharges the iPhone. Once the case is out of juice, your iPhone is left with somewhere between 80% and 90% of its reserve and you’re ready to rock and roll again.
Yesterday, mophie announced that the juice pack air will be available in two new colors — red and white (insert white iPhone 4 joke here) — and the case retails for $79.95. The company also makes several non-case, universal juice packs with a standard USB connection for other power-hungry devices. If you’re looking for a gift for a gadget-geek this holiday season, you might want to consider a mophie power pack.