https://www.techradar.com/news/samsung-galaxy-note-9-could-have-a-big-battery-and-an-in-screen-finger-scanner

Two potentially major highlights of the Samsung Galaxy Note 9 have just been rumored, with the phone said to have a fingerprint scanner built into the screen and a big 3,850mAh battery.

That's according to Ice universe, who has leaked accurate Samsung information in the past. It's also somewhat believable, given that the Samsung Galaxy S9 Plus and Galaxy S8 Plus both have 3,500mAh batteries, which is a larger size than the 3,300mAh one in the Samsung Galaxy Note 8.