Default YouTube battery drain?

Can anyone tell me why youtube is destroying my battery. Its done this 2 days in a row today it took me from 100% to 15% in 4-1/2 hrs now I was listening to music thru Bluetooth on Google play but this is rediculous battery drain with youtube having 2+ hrs of CPU usage... I am not rooted running stock 4.4 KitKat on this ATT S4
here is my batt stats
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