You can try BetterBatteryStats. It's $2.49, but you can run it on an unrooted device using some provided adb commands.
Edit: Moreover, I installed Nova Launcher, What that allows me to do is that, when I open Nova, and then check out the app drawer and go into settings, I can access more settings than on the Onyx launcher. One of those settings is Battery Saver, which normally is part of Marshmallow. That may help as well.
Last edited by downeaster59; 04-21-2018 at 10:00 PM.
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