277634#*# doesn't work on mm
Maybe U can try *#546368#*815#*
This is a Taiwan friend named pei621 told me.
link is here
New Open Beta 29 Update rolling out already!
Yes，it is work in oos4.1.3!
After playing RealRacing 3 in 48m40s，and the sot is 1h1m46s，the battery drained from 91% to 69%。
In my phone, that option isn't in there too.