My Note 8 shows an expected battery time left of only 18hrs on 100% charge. Also, if I am not using my mobile, the battery still discharges and thus, mobile's onscreen time reduces dramatically. Is this fine? Is it so with every Note 8?

Is it okay that my Note 8 drains out almost 9-10% battery everynight when I am not using it (with Always on Display and 4G always connected)?