My battery drains even the screen is off. Battery consumption said it's the Android OS that is draining the most of it since it's about 75+%. I've uninstalled alot of apps till Android OS is the only one who drains the battery the most. While other remaining apps just consumpt around 1%-5%.. I'm not even using the phone. I fully charged it to 100% at 1am and it's already drained and dead when I woke up.