Power management is a great example of how Apple works to extend the lives of their products. I have an iPhone 6s (~4 years old) on the original battery; with

Power management is a great example of how Apple works to extend the lives of their products. I have an iPhone 6s (~4 years old) on the original battery; with power management turned on, I get 1-2 more hours of use in a typical day. More importantly, the battery indicator will go the whole way down to 1% and then gives me another ~20 min, which is plenty of time to plug into a wall or an external battery pack. Without power management, the phone can turn off unexpectedly any time under about 30% on the meter.