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My Galaxy S5 is a little over a year old, and usully went a couple of days between charges. For the last week or so, it doesn't make it for one day. I always close all apps when done, generally use the phone very little. Possibly related: Avast! installed come kind of magic battery saver recently, and I noticed much longer battery life for a while, but now it's gone in the toilet. Tonight, 11 hours after taking off the charger, remaining life was 9% and Android OS was responsible for 37% of the usage.
I turn off all services I don't need at any given time: bluetooth, location. Location is a HUGE battery zapper.
I then uninstalled Facebook and FB Messenger
Seems like an older thread, But here goes. Same problem here. Last week it was Android OS causing the drain. Now it's Android System. What''s the difference between the two? Why does it change week-to-week or even day-by-day?