Is this battery drain normal?? Samsung a8 2018

[Android Central Question]

I bought my new phone today Samsung a8 2018 brand new ain't put it on charge yet, -40%in 3 hours 14 %screen and 9% android system

 

[A Noise Annoys]

I bought my new phone today Samsung a8 2018 brand new ain't put it on charge yet, -40%in 3 hours 14 %screen and 9% android system

I found the drain on my A8 to be awful during set up over the first two days; it also used 4GB of data during that time too until I sorted the settings out. After that it seems to have settled down considerably and I'm easily getting at least a day and a half of use out of it, sometimes two days. Data use is back to where it should be too.