A:Answer I work in the area of reducing energy consumption of LCD displays. It is not true that running at 1080P will help battery life. The reason that battery life is reduced with a 4K display is that there are 4x more transistors (one per sub-pixel) blocking light for the 4K case and they are there weather you are running 1080P or 4K. Guys, if you don't know, don't guess.