Samsung Galaxy S27 Ultra batteries may get a major upgrade
Safety Korea certification photos appear to show larger Galaxy S27 Ultra and Pro batteries, but Samsung has not confirmed the leaked capacities.
Samsung's next premium phones may be getting a meaningful battery bump, but the evidence is still a certification leak rather than an announcement. Photos from a South Korean Safety Korea filing show battery packs labelled EB-BS958DBY and EB-BS957CBY, believed to correspond to the Galaxy S27 Ultra and Galaxy S27 Pro.1
The images are too low-resolution to confirm the printed capacities. However, separate 3C certification details reported by Android Police point to rated capacities of 5,534 mAh for the Galaxy S27 Ultra and 5,087 mAh for the Pro model.2 Those figures would likely translate into advertised typical capacities of roughly 5,700 mAh and 5,200 mAh, respectively.
That would move Samsung beyond the 5,000 mAh battery used by recent Ultra phones, although it would not put the S27 Ultra at the front of the Android pack. The leaked packs appear to use conventional lithium-ion chemistry, not the silicon-carbon cells appearing in some Chinese flagships. The same certification trail reportedly lists 60W wired charging for both models, suggesting Samsung may improve endurance without changing its charging approach.
The component markings also identify Zhuhai CosMX Power as the manufacturer. As with any pre-production certification, the final batteries can change before a retail launch. Samsung has not announced the Galaxy S27 range, its pricing or its availability, so the capacity and release claims should be treated as reported specifications rather than confirmed product details.
Our opinion
A larger battery would be a sensible, overdue improvement for Samsung's premium phones, particularly if it arrives without a thicker design. But the certification photos do not prove the final retail specifications, and the reported figures remain more evolutionary than revolutionary. Until Samsung publishes formal details, the safest reading is that the Galaxy S27 Ultra and Pro are being tested with larger cells — not that every leaked number is locked in.
The original report is from Android Police, while NotebookCheck's corroborating coverage identifies the images as coming from the Safety Korea certification listing.23