So recently my s4 has been getting some bad battery life. It usually around 2hours screen on time but now it is draining at An insane pace. I am getting around 45 minutes of screen time. When the phone is off it loses around 1% every 3 minutes and around 1 minute when the screen is on. I have gsam and it shows 70% are from app usage and android os and kernel taking up the majority. Is there anything i can do?