Samsung Galaxy S4 Battery Life Question! Whats normal?

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http://forums.androidcentral.com – Hi everyone, I recently got the galaxy s4 with t-mobile, and I am loving it! Except, I am not quite sure if my battery life is normal. I have been reading a lot of different posts where people claim to get at least 11 to 12 hours of the phone, and up to 3-4 hours of actual screen time. I have been testing out my battery, I uncharge usually in 9 am then I use it until the battery reaches 2%. I look at the battery app, and see that the most I can get is about 9ish hours and only 2.5 hours of actual screen on time. I turn off the smart features, gps, use wifi when I have it, auto-brigh (HowTos)