Prior to starting each test, I charged the device until the battery was full.



Then I played a 3 hour video on YouTube stock app. When playback was finished, I noted the remaining battery.



The procedure was repeated, i.e., phone was fully charged and a 3 hour YouTube video was played. But this time I used BSoL to turn off the screen while the video was playing. As I did before, I noted the remaining battery after playback was finished.



These are the results of running this test on two devices:

Motorola Moto G: 61% battery save when BSoL was enabled;

when BSoL was enabled; Sony Xperia E1: 58% battery save when BSoL was enabled.