Battery draining extremely quickly Galaxy S7

This has being a common problem with S6 due to update to marshmallow, I believe this should also work for your S7.

Wipe your phone cache or system partition by following the steps below;

Go to Settings

Storage and USB

Cached Data

OK. This should wipe your system partition.

Or you can also do the same thing from recovery mode by following the steps bellow:

• Turn off your Galaxy S7.




• Press and hold Power




• When ‘Samsung Galaxy S7’ appears, immediately release the Power key and then press and hold the Volume Down button to access Fastboot




• Use the volume buttons to highlight Recovery and press Power to confirm.




• If you see the Android robot, press Power, then Volume up briefly to access Recovery.




• Scroll down to Wipe cache partition and hit Power to confirm.




• Scroll down to Yes and hit Power to confirm.




• Reboot

If the problem persists, you can also clear the app cache for your device and the last resort is to do a full backup and perform a factory reset. Wiping your device and restoring your apps and data is one of the simplest and best ways to avoid any weirdness battery drain and general system performance issues.