Samsung has submitted batteries for its upcoming Galaxy S27 Pro and Galaxy S27 Ultra smartphones to the South Korean Safety Korea certification database. The battery models are identified as EB-BS957CBY and EB-BS958DBY, respectively.
The components are manufactured by the Jinwan subsidiary of Zhuhai CosMX Battery, a company established in 2007. The subsidiary, founded in July 2018, specializes in the production and assembly of battery packs and related hardware.
According to regulatory filings, the Galaxy S27 Ultra is expected to feature a typical battery capacity of 5700mAh, while the Galaxy S27 Pro is slated for a 5200mAh capacity. These figures correspond to rated capacities of 5534mAh and 5087mAh.
The 5700mAh battery in the Galaxy S27 Ultra represents an increase of approximately 700mAh compared to the 5000mAh battery found in the previous Galaxy S26 Ultra model, marking a growth of about 14%.
