I used this app a lot when I had a 4S. Has anyone also tried it? There are other similar apps in the same category such as Battery Doctor and Battery Magic. The feature that I was drawn to with these apps is that you are shown how long until the battery is fully charged. I got to thinking to myself though if the app is really necessary considering that battery functions would be handled by the Operating System. So is having one of these apps a good way to effectively manage your battery?