Re: My Android system on my Galaxy s5 is using up 30% of my battery. Any idea why?
Install CM security. There is a cleaner to clean trash, boost memory (clean) and most important 1 tap hibernate which will hibernate
apps running that drain your battery.
Go to Settings, Applications, Call, Call accessories and check the Automatic answering box. It is counterintuitive but it says
only works with headset plugged in or bluetooth on. Solved my problem.