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"Shut App" or "Doze". Read the descriptions at the play store & give it a go. It works for some folks, but not all. If you're not happy with the results, just uninstall it. It works good for me, but not great. But it does the small work that i want it to do.
About cleaning junk etc, I use to have an app like that. Long story short & being a rookie during them times- my new phone blacked out.. Died. Dead. No clue what happened. Didn't wanna turn on or anything. I figured out later what was causing it. I learned my lesson after that.
Those apps may have once been useful but Android has progressed far enough that they are now outdated, unnecessary & rather harmful. Android’s operating system has its own native handler for assigning RAM to apps and making sure that all of it is being used in the most optimal way.Our phones purposely tries to keep apps loaded into RAM for better performance. RAM is fast, remember? On mobile devices every bit of speed is critical for a good user experience, so keeping apps in RAM is actually a good thing.
If you want to go on the natural route to save battery; I mentioned this b4 on AC–
Check to make sure you're not on Global bc it uses more battery searching all the possible Global networks. Every & all phones; Are set to Global Automatically. Everytime i get a new phone, its the FIRST thing i do. Go to – mobile networks – network mode – select LTE/CDMA.
Calibrate your battery meter
--Allow your phone to discharge down to 15% (low battery warning)...do not allow it to discharge any lower. A complete discharged battery or a battery discharged below about 10% causing the phone to do an emergency shut down and you won't be able to get it to turn on.
--Power off your phone completely. Place the phone on charge using the factory provided cable and charger. Charge the battery until full. You can tell when it is completely charged by pressing the power button.You can tell from that indicator if your battery is fully charged.
--After fully charging youre phone you can take it off the charger and reboot.
--Perform this discharge/charge process every month of two. This keeps your battery meter in calibration with the actual charge on your battery.
Widgets–even though cool, use battery. Widgets run all the time, so theyre using resources all the time. Limit the number of widgets you use and if they update periodically set the update or "sync" interval to as long a period as you can stand.
The background– (wallpaper) you use makes a difference. A bright wallpaper (like white etc) will use more power than a dark wallpaper. Like live wallpapers, as we know & they are battery hogs.
When all fails and you're still getting poor battery, then do a Factory reset (in terms of apps installed etc). It is a good idea to do a Factory Reset b4 you
Calibrate your battery meter
but you don't have to.
Does the Battery saving apps really work? It seems like in my experience, they haven't. Maybe I've downloaded the wrong battery saving apps.
I use to use CM Locker app but I'm not sure if that's draining my battery as well.