Personally, I don’t like Dark Mode. It just seems wrong. But guess what? Going dark saves battery life. Joe Wituschek explains:
One of the things that Dark Mode could potentially benefit is battery life. If you don’t have to push white or colored pixels and can leave them inactive, you use less battery. It makes sense in theory, but we haven’t seen much in the realm of testing on the subject – until now. PhoneBuff has released a new video in which it puts two iPhone XS models head to head: one with Dark Mode enabled, and one without.
Dark Mode wins. Add a black background to the launch screen and wallpaper, switch over to Low Power Mode, and you’ve got an iPhone 11 battery that will last two days.