I think you may be reading this wrong. Your screen shows the device has been unplugged for 1 second. What you are seeing is normal then as the percentage shown is just a rough percentage of the total battery use. It looks like the screen is draining that much because nothing else is running on the phone yet. Check after a few hours, if it's still that high then you may indeed have a problem. Typically after a few hours, that percentage drops significantly (mine is usually around 20-40%, brightness halfway set).