What does the Ultra Power Saving Mode do?
Power-saving mode existed before, but the new Ultra Power Saving Mode can keep the phone running 24 hours on 10 percent battery, according to Samsung's claim. We'll get back to this over the course of a couple days. A software feature, ultra power-saving mode works by changing the display color to grayscale, limiting the processor, cutting off GPS, turning off Wi-Fi when the screen goes dark, and putting the kibosh on most of your extraneous apps.