This app was mentioned in 5 comments, with an average of 0.80 upvotes
and if you don't want to reset, just go to dev. options - running services and uninstall all apps that you don't use that are running (or use https://play.google.com/store/apps/details?id=de.hp.taskmanager&hl=en)
That's just for windowed apps.
This is the one that I use: https://play.google.com/store/apps/details?id=de.hp.taskmanager
Maybe try an App called taskmanager to kill the apps. "Kill Apps" may not kills all the apps automatically, so go in and kill them manually with this App.
https://play.google.com/store/apps/details?id=de.hp.taskmanager
I wouldn't mind knowing what others think. But truthfully, because of the processor, you may have to live with that trade off with excellent battery life.