https://www.cnet.com/news/galaxy-note-9-ifixit-teardown-reveals-a-powerhouse-battery/

The Galaxy Note series' big battery is back and better than ever in the Galaxy Note 9, as iFixit's teardown of the new phone shows.

Yeah, the 4,000-mAh spec tells you that it's probably pretty large -- typical phone batteries run between 2,500 and 3,500 mAh in comparison -- but according to iFixit, its 15.4Wh capacity blows past the preflammatory Note 7's 13.5Wh and the Note 8's crisis-of-confidence-shrinkage 12.7Wh.