Lots of smartphone users switch their display to dark mode because they find it easier on the eyes. But, it can conserve your battery life, too. Organic light-emitting diode (OLED) devices use individual light-emitting diodes to light the screen, which means that less electricity is used in dark mode because fewer bulbs are at work.
In fact, researchers at Purdue concluded in a 2021 study that OLED screens utilize between 44% and 73% of the device’s total battery when light mode is activated at maximum brightness. Keeping the phone at 100% brightness but in dark mode reduces power consumption by over 40%.