AIUI the backlight dominates the power consumption, so more pixels at the same physical size makes very little difference.

But sure, that's a lot more concrete. So are you unhappy with the battery life on this device? Does the laptop the grandparent was talking about have worse battery life than comparable models? Certainly I'm very happy with the battery life of my Surface Book (which is a lot better than that of the laptop it replace), so to my mind it's not a problem in practice.