IDENTIFYING POWER HUNGRY
First of all, you have to identify which of apps are running behind the scene and how much of individual app causing the battery draining and using the memory. This can be done in every smartphone by just approaching Settings > About Phone and tapping the Build number until you are notified that Developer Options have been enabled, as Developer Options enable you to see the Process Stats. See the below picture how to reach Developer Options first.
There you'll see the option for Process Stats. The Process Stats will help you to dig out how much of an every app using the memory processor and how much it burdening on your phone’s battery.
From there, going to Settings > Battery and then tapping on the individual apps will let you know how much of an individual app is using your phone’s battery. See the following screenshot for further assistance.
HOW CAN YOU DISABLE, FORCE CLOSE OR UNINSTALL THE IRRITATING APPS
After you identify the irritating apps running unnecessarily in background and using more than a routing processor and causing your battery to be drained extraordinarily, then you can easily disable, force to close or even uninstall that app. However, some apps, like your third party keyboard, instant messengers and other constantly working apps make sense to be running all the time, but others do not, so don’t let them make sense.
See the following screenshot for further assistance.