My vote goes to free tool Mobile Worker. Easy to use and you can also manage your documents https://play.google.com/store/apps/d...leworker&hl=en
The best app to use is greenify. The paid version you can even stop system apps as well. Better then freezing because can still use apps when you press the icon in app draw. The app keeps Apps closed when you not actively using them saving battery big time. The app I found draining battery was Google play services!
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