Samsung Galaxy S27 Ultra and Galaxy S27 Pro models appeared in South Korea’s Safety Korea certification database. The Galaxy S27 Ultra is equipped with a battery identified as EB-BS958DBY, while the Galaxy S27 Pro uses the EB-BS957CBY model.
Zhuhai CosMX Power manufactures the batteries for both of these upcoming devices. Technical specifications indicate the Galaxy S27 Ultra has a rated capacity of 5,534mAh, with an expected typical capacity of 5,700mAh.
The Galaxy S27 Pro features a rated capacity of 5,087mAh and a typical capacity of 5,200mAh. Both handsets received certification for 60W wired charging.
The Galaxy S27 Ultra battery provides a 700mAh or 14 percent increase over the 5,000mAh battery found in the Galaxy S26 Ultra. A 200mAh increase over the Galaxy S26 Ultra is possible for the Galaxy S27 Pro.
Samsung tested a Galaxy S27 Ultra prototype featuring a 7,000mAh battery but opted for a smaller capacity to maintain the S Pen. The Galaxy S27 Ultra and S27 Pro are expected to launch in early 2027.
