Legacy. Hermann Ebbinghausâ lasting contributions to the field of psychology are multiple. In addition to being the first psychologist to study areas of human learning and memory, Ebbinghaus contributed greatly to the establishment of experimental psychology.
This includes dimming the display slightly, stopping Mail push and fetch, turning off background app refresh, turning off Hey Siri, and a few other iOS features. By turning these features off, the battery life of the iPhone is extended dramatically, and when Low Power Mode is enabled the iPhone battery icon is yellow to demonstrate this.
1 Scroll down and select the Battery option.  Tap the button to the right of Low Power Mode to turn the setting off. Your battery icon should no longer be yellow. As mentioned earlier, you will likely see a decrease in battery life after turning off Low Power mode.