According to Ice Universe via Twitter, the Samsung Galaxy Note 9 will ship with a 4,000mAh battery. Ice universe is “100 percent sure” in the info that he provided, and it remains to be seen if it is accurate as well.
This isn’t the first time that Ice Universe has said the Galaxy Note 9 will come with improved battery capacity, though. Back in April, the mysterious leaker announced that Samsung's Galaxy Note 9 battery size could be between two capacities – 3850 or 4000mAh.
Regarding the possibilities of the Galaxy Note 9 charging specification, in the FCC database, you can find a new Samsung wireless charger with model number EP-N6100.