My iPhone 5s battery isn't reaching it's full potential?

So I just got an iPhone 5s on Monday. It came about 60% charged. I used it until it died then charged it to 100%. Ever since then my iPhone has had an alright battery life. It's neither horrible or great battery life. It lasts a bit. There's not a significant drain either. Does it take a few days for the battery to fully calibrate?

IPhone batteries last anywhere from 3 days to 2 hours depending on how you use it. If you are using it most of the day the battery won't last long. If you leave it in sleep mode for a day or so it will most likely still be alive