Originally Posted by Covert_Death
since its NOT an LCD screen, screen size doesn't matter, ONLY resolution matters when it comes to battery life, so a 4.0 inch screen and a 5.5 inch screen both using AMOLED technology drain the same power if they are both 720p resolution...
But what you seem to fail to notice is that bigger screen will have large pixel than smaller screen even at the same resolution. On AMOLED screen, larger pixel means larger LED emitting area, hence more power to light it up.
I'm also puzzled that Ultra has more battery life as listed on Verizon site. Screen and battery size don't make sense for that.