It is reccomended that you use the Auto Start Manager in order to disable apps from running in the background. You can go on to select both the Preloaded and the Running apps section and select or uncheck the individual applications. Reducing the screen time to less than "'''30 seconds'''" also helps you to improve the battery life of the phone.You can find out [http://www.faceofit.com/resolve-fix-fast-battery-draining-issue-asus-zenphone-2-5|How To Resolve and Fix Fast Battery Draining Issue in Asus ZenPhone 2]5 for more detailed information.