DU Battery Saver prevents battery waste on a number of levels. On the one hand it saves energy by limiting all those app that try to push notifications on your Android phone – it even tells you how much power you save as you cancel each. It can also close app that can overheat your phone, a huge drain on battery. You can schedule these activities and change the time until the screen turns off. That app even lets you know how much energy all of your tweaking saved.