The Galaxy S27 Ultra is set to feature a larger battery than its predecessor, with a capacity of 5,700 mAh, compared to the 5,000 mAh found in the Galaxy S26 Ultra. The Galaxy S27 Pro, a new addition to Samsung’s lineup, will have a slightly smaller battery at 5,200 mAh. Since the Galaxy S20 Ultra was released in 2020, Samsung had used the same 5,000 mAh battery across all Ultra models. However, a certification from China’s 3C regulatory body shows that the S27 Ultra will have a nominal capacity of 5,534 mAh and a typical capacity of 5,700 mAh. The S27 Pro also appears in the database with a nominal capacity of 5,087 mAh. Both models are set to support wired charging at 60 watts, a feature first introduced with the Galaxy S26 Ultra this year. The Galaxy S27 Pro marks a new step for Samsung. It is the first time the company has used the name "Pro" in its S series, which typically includes models like the S27 and S27+ as entry-level options, followed by the S27 Pro and S27 Ultra. The Pro model is positioned between the Plus and Ultra variants, without replacing the Ultra. This increase in battery capacity is likely due to the use of silicon-carbon (Si-C) battery technology, which replaces some of the graphite in the battery’s anode with silicon. This allows more energy to be stored in the same space without making the phone bulkier. Samsung has already used this technology in its latest foldable models, the Galaxy Z Fold 8 and Flip 8. According to Counterpoint Research, the average battery capacity of smartphones reached 5,291 mAh in January 2026. Meanwhile, smartphones with at least 6,000 mAh accounted for 29% of global sales, up from 10% the previous year. Chinese brands like Xiaomi, Vivo, and Oppo have already surpassed 6,000 mAh, with some models reaching 7,000 mAh. In contrast, Samsung’s upcoming flagship, the Galaxy S27 Ultra, will have a maximum capacity of 5,700 mAh, which is a notable step behind its competitors. The Galaxy S27 Ultra is expected to bring more than just a larger battery. Leaked technical renderings suggest a new design that continues the integration of the S Pen stylus. The S27 Pro and Ultra are also rumored to use the same panel technology as the latest iPhones, and the front-facing camera may be inspired by Apple’s design. However, these details remain unconfirmed, as Samsung has not officially announced the Galaxy S27 series. The models are not expected to launch until early 2027. Until then, numerical certifications will carry more weight than leaked information. If confirmed, the Galaxy S27 Ultra would represent the first significant increase in battery capacity since 2021, offering a substantial boost in battery life.