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Somewhat popular but hasn't been mentioned yet, so I'll go for it: Greenify! It's an app to save some battery life, even without using root. It will keep Android from starting up apps when the screen is turned off for updates/pushes etc and you can select which apps you want to not use energy when you don't use your phone. This way the phone doesn't have to work as much when the screen is off and saves battery. For me, it made a big difference