Samsung Galaxy S6 is one of the Galaxy phones with non-removable batteries. Also, users have reported their concern about the fast battery draining on their Samsung Galaxy S6 phones. A fast battery drain on Samsung phones is quite common and there could be several reasons behind that.
***Tips to fix Samsung Battey Fast Draining***
* Get rid of Resource eating apps
* Close the recent apps
* Ensure Proper Reception
* Check for Malware and Spyware
* Disable Notifications
* Disable System apps like Bixby and S-pay
* Use Power Saving Mode
* Turn off background sync
* Disable unused radios
* Keep screen brightness in check
* Factory Reset the Galaxy
* Buy a Battery Pack
Source: [link|https://fixyourandroid.com/fix/fix-samsung-galaxy-battery-draining-fast/|https://fixyourandroid.com/fix/fix-samsung-galaxy-battery-draining-fast/]