Sent from my SM-N900P using XDA Premium 4 mobile app
If you're not rooted, check out Clean Master or DU Battery Saver on Google Play.
These apps manage your phone in the background and they are relatively small in terms of app size.
If you're rooted and are using a custom ROM check their threads for any issues or try another ROM.
I'm currently using the Odexed Blue Themed ROM which is basically stock except for a few tweaks including theme changed to primarily blue.
I was using the Minin ROM before which is a stripped down version of the Stock ROM.
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