My guess is it all depends on what you are doing. Screen uses the most battery. You tube, video's, etc will use a lot of battery. HD games will use a lot of battery. Doing alot of things at once will use a lot of battery. Basically what you want is for the overall battery use to be in relation to what you are actually doing. For example, there are days I am using my phone a lot, on phone calls, looking up stuff on the web, texting, tapatalking (really DroidForuming), etc. On those days I expect my battery to drain in 15 -20 hours. Then there are days where I am not using my phone hardly at all. On those days, I can expect my battery to last over 24 hours.