Nowadays, Dark Mode on smartphones is considered to be a useful feature for users. Enabling Dark Mode on your smartphone will save your phone battery, as we have heard before. However, a study and research from Purdue University show that for general use, Dark Mode saves the battery life of smartphones is not as much as some people have thought in the past.
The same study also showed that the black background seen in most applications does not save as much battery as the black background when gray Mode. According to the test, the six different apps: Calculator, Google Calendar, Google Maps, Google News, Google Phone, and YouTube run on the Google Pixel 2, Pixel 4, Pixel 5 and Motorola Moto Z3. All in all, Dark Mode saves the average battery life of these four smartphones by an average of 3 to 9% when their screens are in the 30- to 50% brightness range.
While the screens of the Google Pixel 2, Pixel 4, Pixel 5, and Motorola Moto Z3 are in 100% brightness, the Dark Mode feature saves the battery life of these four smartphones by 47%. Therefore, according to the test results, it is shown that for use in general (Indoor) Dark Mode function saves the battery life of smartphones is not as much as when used in full sun (Outdoor).