Background processes can consume as much as 48% battery. MIUI 7 optimizes background processes, extends battery life by 10%. Watch Mi 4 (running MIUI 7) take on the LG G3 and Galaxy S5 in a battery performance test. How do you think Mi 4 did?
You have 2 cores disabled in 'Balanced mode' its essentially a dual core vs quad & octa. You're worse than Apple at misleading..besides its still running KitKat not Lollipop when Marshmallow is out your iOS clone is MIUI. You offer great hardware but dreadful software!
The G3 has a 5.5-inch 1440p screen with a 3000mAh battery. The S5 has a 5.1-inch 1080p screen with a 2800mAh battery. And the Mi 4 has 5.0-inch 1080p screen with a 3080mAh battery.
See a pattern? The Mi 4 has the largest battery and the smallest screen… so naturally, even without MIUI 7, the phone should outlast the competitors.
Furthermore, LG and Samsung are also two companies who are notoriously known to put above average amounts of bloatware and other crap on there phones. All of this can affect battery life.
Also, judging from the video, it seems that the notification bar is a bit crowded… I don't know if the Mi 4 is running the same background processes as the competitors… it might be.
Lastly, I would like to point out the fact that neither of the competitors seem to be running the latest update of Android, Android Lollipop. And Lollipop offered some pretty solid performance upgrades.
So, all in all, I would say that this test is rather "dishonest" and doesn't really show anything too valid. This said, I am not denying that MIUI 7 offers some performance upgrades, I am just saying that this is a really bad way to show it.