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Samsung’s next flagship phones look set for a solid battery bump. Regulatory documents have now spelled out the exact capacities for the Galaxy S27 Pro and S27 Ultra, which are expected sometime in early 2027.
Samsung started using higher-capacity silicon-carbon anode batteries in its recent foldables like the Galaxy Z Fold 8 Ultra. That made people wonder if the regular S-series would get the same treatment. Earlier reports from GalaxyClub had pointed to a 5,700mAh battery for the Ultra and around 5,200mAh for the Pro, numbers that lined up with what most expected.
Photos of the actual battery packs later showed up in Safety Korea certification records, but the images were too blurry to read the numbers clearly. TÜV Rheinland filings have now filled in the blanks. The Galaxy S27 Ultra’s EB-BS958DBY cell is listed with a 5,534mAh rated capacity and a 5,700mAh typical capacity. The Galaxy S27 Pro’s EB-BS957CBY cell comes in at 5,087mAh rated and 5,240mAh typical, a bit higher than some of the earlier Pro estimates.
That’s a clear upgrade from the 5,000mAh batteries that have been in recent Galaxy Ultra models. The Ultra’s jump is the more impressive one, giving it roughly 14% more capacity. Both cells are made by Zhuhai CosMX Power in China, and related certifications also show support for 60W wired charging, same as the previous generation.
Samsung is expected to announce the Galaxy S27 series in early 2027, with most reports pointing to a late-January or early-February window. Final retail specs can still shift a little, but these regulatory numbers are the strongest confirmation we’ve had so far on battery size. Pair that with possible efficiency gains from newer processors and the silicon-carbon chemistry, and we could see noticeably better endurance without the phones getting much thicker.
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