BATTERY LIFE-SAVING TIP:
Use "Greenify" app in Play Store instead of overhyped battery savers. The worst part is that when you use a task killer, it reruns the app, which consumes more battery to rerun it.
Interestingly, Greenify app works a bit different: it automatically hibernates the app when the screen is off, instead of killing it like typical cleaners.
Another thing is it also works with non-root phones.
