Is it normal for a brand new tablet battery to drain so fast?

Hey guys. I just bought a brand new Samsung Tab S4 which is supposed to have a 7,300mAh battery lasting for up to 16 hours of video playback. I've had it for 2 days now. First day I've used it pretty heavily and it went from 100% to 2% in around 8hours. Today I had to work so I left it at home and the percentage was quite high, now I come back and it's down to 18% completely unused. This seems like a disappointment since all the reviews of people praising the battery had my hopes up. So did I get a bad one or could this be normal? It's quite cold here and I heard that drains the battery quicker. But still I'm considering returning this while it's early.
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Is it normal for a brand new tablet battery to drain so fast?
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