The 4s and 5 have "crappier" battery life than the 4 because the formers are more powerful than the latter, thus consume more battery. iPhone 4s and 5 have much much much better battery compared to other high-end Android devices.
I hope it stays the same because it's rightly so. So sick of the so called ipad killers. I have a nexus 7 and it freaking sucks. I have a video on my youtube channel showing how laggy it is just to scroll between the apps. Saving and waiting for the ipad mini retina display.