I've had my 8 plus for 3 days now after coming from a note 8. I'm a very heavy user and battery on screen time coming in at 10 hours!
Will it stay this way?
It's comparable to me when I had to charge my note 8 every day and average 4 hour ost
Pretty dire battery for a note
On other hand, my iPhone 6S battery dropped 20% in an hour. With instant messaging, video watching. And battery health reported as 100%. So it is not battery problem. I have exact opposite experience with OP. My Huawei Mate 10 excell on battery life
It could still be a battery or other hardware problem. It's not like that behaviour is normal.