Both the Galaxy S7 and S7 Edge feature QHD displays. This makes for some pretty sharp displays, although there are some who might argue that we probably couldn’t really tell the difference between Full HD and QHD to begin with, which is why it feels like a wasted feature, a feature that also consumes battery.
It seems that this is something Samsung has thought about because according to Android Central, they have noticed that with the beta version of Android 7.0 Nougat on the phones, Samsung has defaulted the resolution to a Full HD resolution. Users have the option of choosing between HD (720p), Full HD (1080p), and Quad HD (1440p), and prior to this the default was QHD, but now it is FHD.
Like we said, it seems to be a battery saving feature where because there are less pixels displayed on the screen, the less energy it consumes. It is possible that once the final build has been released it could be defaulted back to QHD, but for now this is something to think about. As Android Central notes, the difference between QHD and FHD isn’t that noticeable, but dropping it down to 720p is.
At the end of the day we’re not sure exactly how much more battery one could save by lowering the display resolution, but if you’ve tried everything else, it does seem like it could be a last-ditch measure in the event you need your device to last you just a little bit longer.