Severe Battery Drain

Here you go.
How to wipe the system cache on the Galaxy S6
If it's your Android system that is acting weird and not just an app or two, you might want to clear the system cache, also known as wiping the cache partition. The most common time this is useful is straight after an Android update, when battery drain, glitches, crashes or other weirdness can occasionally affect your system.

1. Turn off your Galaxy S6.

2. Press and hold Power, Volume Up and the Home button.

Press and hold Power, Volume Up and Home. / © ANDROIDPIT
3. You'll see a blue screen with the Android on it, then you'll be taken to the recovery menu.

4. Use the volume buttons to scroll and highlight Wipe Cache Partition. Press Power to confirm.

Select Wipe Cache Partition. / © ANDROIDPIT
5. You'll see a message in yellow at the bottom of the screen when the process is complete.

You'll get a ''wipe complete'' message once it's done. / © ANDROIDPIT
6. Highlight Reboot System Now and press Power to confirm.

Time to rebooot your Galaxy S6. / © ANDROIDPIT
7. Your Galaxy S6 will reboot and recompile all of your apps. It might take a little while to re-cache them all, but once it is done you should have a Galaxy S6 running as smooth as can be.

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Severe Battery Drain