This function is simply awesome and is definitely one of the massive improvements that the device has gotten with context to the Lollipop operating system. We all know that smartphones have issues with power in the battery, and in various such clutch situations one needs that extra hour of charge in their battery to avoid problems.
This is where the EPS comes on action and has activation options of three types, 20%, 10% and 5%. Select your desired battery remaining percentage and then get power of an extra 1 hour or more.
Great advantage and definitely one of the best power saving options available.
For more info, watch the video below: