I will post where I want to post, who do you think you are? What attitude did I have? Dude, drop the E-Thuggery. Also, unless you are a mod, don't talk to me like that.
15 hours is pathetic. Period. No phone idiling like that should die in 15 hours. These devices have a couple days of idle.
His phone has issues. OP, you need to get a wakelock detector. Do not listen to the dude who says your battery life isn't bad, It's terrible. There is something keeping your phone awake. 15 hours of idle should have used about 10% of your battery. 1 hour of screen time, roughly should have cost you about 20-25%. That's about 35% of your battery life.
I suspect that you may have the locator bug that others are reporting. Do you have google now enabled? Are your location services turned on? These are causing wake locks with 4.3.
Never settle for an idle phone draining in 15 hours. This isn't 1998 anymore.