I can only tell you what I have done that has helped. I turned off "automatic" for screen brightness and have it set the lowest light I can comfortably deal with. My area only has 3G, so I have it set to not look for 4G. My previous phone used a lot of battery looking for wifi (which I never use because I rarely have access and do have unlimited data), but I'm not so sure about the SG3...I have tried it both ways and don't see much difference. One thing that I did discover was sucking a lot of juice was the annoying Google+ app. After disabling it (I would uninstall if I could) that helped quite a bit. I try to keep wallpaper for home and lock screens dark and do not use live wallpaper. I was told Juice Defender would help, but it seemed to use more than it saved so I don't use it. I typically charge it every night, and go to bed at over 40%. That usually means 1 or 2 calls, checking a social site or 2, maybe poking around Google Play or checking email, and then anywhere from 50 to 200 texts in a day. Is that light use? I'm not sure, but I usually start the evening at around 85%, so compared to previous phones, I am pretty happy so far. I think for the most part, it depends on what you expect, and what your previous experience is.