Fixing the system should fix the Android battery drain issue as well and that is what the following guide teaches. Most of the time, though, the issue is with the core system of your device. There are various reasons as to why the battery quickly runs out on your Android based device. I tried changing the brightness and other suggested settings and it seems to be the 'android system' that is using all the battery.'Īlthough most Android smartphones have batteries with large capacity, many users still seem to complain about the Android system battery drain. 'My Samsung Galaxy S8 did the recent Android update in April 2019 and now I will charge it to 100%, clear any active apps, go to bed, and it will be dead/0% battery in the morning (about 8 hours). Fix Wifi Calling Not Working on Android.Fix Android not Receiving Group Texts from iPhone.Android Software Update Unable to Connect to Server.