The Galaxy Note 9 not only has a better battery life than its predecessor, based solely on the in capacity, but it also has one of the best endurance streaks amongst its current peers with high-resolution displays. Samsung is still modest, though, and advertises it as an "all-day battery" phone, which is not what you'd expect from a 4000 mAh pack, but it is at least realistic that this means a day with heavy usage.