A battery test proved that activating Dark Mode, a feature that came with the launch of iOS 13 last month, do extend the life of iPhones with OLED displays.

A new test from PhoneBuff this weekend aims to discover just how much better Dark Mode is for battery life than Light Mode.

PhoneBuff used an iPhone XS as the test devices on which they employed robotic arms to do things throughout iOS both in Light Mode and Dark Mode.

The test showed that the iPhone XS using Dark Mode drained battery at a much slower pace than the iPhone XS using Light Mode.

According to the end result, when the Light Mode iPhone XS died, the Dark Mode iPhone XS still had 30 percent battery life!

iPhone owners can set the feature to activate at specific times of the day, but they can also choose to have it turned on permanently. This test shows there are reasons to always have Dark Mode activated on iPhones with OLED displays.

Black on an OLED screen means that the pixel is powered off. With more pixels deactivated in Dark Mode compared to Light Mode, this results in improved battery efficiency.

In comparison, iPhones with LCD screens, such as the iPhone 11, still have their pixels turned on when showing black, so they are not able to enjoy longer battery life when on Dark Mode.

Here’s the full chart showing the comparison: