battery saver mode: updates (1/2)

credits to Yanuar Harry<ai.the.smarties.physics@gmail.com>

Change-Id: I5516e6293b052dc8da17f3ad30e848200ea3e6f5
Signed-off-by: Dan Trifan <jimsth@gmail.com>
Merge "battery saver mode: updates (1/2)" into kk44