Samsung galaxy s5 losing battery fast, help?

i just got a galaxy s5 today and its losing battery at a rate of 5% every 20 mins. Not even on the whole time. I thought it was losing battery fast so i waited until i charged it. The first 5 % i let drain and ans soon as it hit 95 i times it. I surfed through various apps. The app store etc half the time. The other half it was locked and screen was off. I switched back and forth on and off. I didnt open any app extremely stenuous. The battery isnt getting noticeably hot either. They advertise the battery for 24 hours of talk time but at this rate with mild activity it wont even last 7 hours. Is there something wrong with my battery?
Added (1). all aps are off. Appkilled it says the biggest drain is android system followed by screen then by android OS. But android system had a pretty big lead.
Added (2). android system 28%
screen19%
android os 16%
lookout14%
then all other apps i used were insignificant but strangely tetris was the highest at 4%. Higher than pandora lol

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