One of the things that has plagued me since my first phone is that I seem to pretty much always be on it. Annoying as that is for those around me, it seems to take the most toll on the battery of every mobile device that I’ve ever owned. The iPhone is actually one of the better of the devices that I’ve had, but I could just use a little more juice. Which is why I got a Mophie Juice pack. The Mophie is an iPhone case, but it also has a battery in it. The battery can give it up to 4 and a half more hours of talk…