Dear Samsung Member,
Greetings from Samsung Customer Support!
To resolve this "battery drainage" issue kindly follow the given below steps:-
1)Battery optimization:-Settings>Select Device Maintenance/Device Care>Optimize>Optimize all options like Battery, Storage and Memory
2)Check device in safe mode:-Power off the device> Press and hold the Power key for one or two seconds to turn on the device>When the Samsung logo appears, press and hold the Volume down key.
(If your device functions correctly in Safe Mode, it is most likely that the issue lies with a 3rd party application that can be uninstalled to resolve the problem.)
Exit safe mode: Restart the device.
For more information on battery drainage please click on the link:http://www.samsung.com/in/support/skp/faq/1101689
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report/ask question).
Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
Thank you for writing to Samsung.
Samsung Customer Support