The Galaxy S27 battery upgrade looks set to be Samsung’s largest since the Galaxy S20 series, with certification filings listing typical capacities of about 5,200mAh for the Galaxy S27 Pro and 5,700mAh for the Galaxy S27 Ultra. Certification listings usually record a “typical” figure that sits slightly above the rated capacity printed on the box, but the gap between generations is still the headline here: Samsung has not moved battery capacity by this much in a single generation since the S20 launched.
Neither Samsung nor a carrier has confirmed the numbers, and certification records can shift before a phone ships. But the filings are specific enough, matching typical capacities to named models, that they are usually treated as a reliable late-stage signal rather than a rumour.
What the certification figures show
The two numbers matter for different reasons. A 5,200mAh cell in the Pro would be a meaningful step up for Samsung’s mid-tier flagship, historically the model asked to do the most with the least battery. A 5,700mAh cell in the Ultra would give Samsung’s largest phone room to run a brighter display or a more power-hungry chipset without the usual trade-off in screen-on time. Neither figure has been paired with a screen size or chipset yet, so it is not possible to say how much of the gain reaches actual runtime versus offsetting new components.
Our arithmetic on the Pro-Ultra gap
By our arithmetic, the Ultra’s 5,700mAh cell is roughly 9.6% larger than the Pro’s 5,200mAh, a 500mAh difference. That is a wider split than Samsung has run between these two tiers in recent generations, and it lines up with other reporting suggesting the Pro and Ultra are diverging on more than just price this cycle. GSMArena separately reports that both the Pro and Ultra are set to use Samsung’s M16 OLED panel, a supplier detail the wider coverage of this leak has not carried.
We reported in August that Galaxy S27 renders showed a design split from the Ultra, with the two models pulling apart on camera layout and build. The battery figures extend that pattern: this no longer reads as a shared chassis with a size difference, but as two devices tuned for different jobs. Our earlier piece on the Galaxy S27 Ultra’s S Pen getting scaled back fits the same direction, trading a legacy feature for battery and display spend elsewhere.
None of this touches the standard Galaxy S27, which has not appeared in the same certification records and may be carried over at a smaller capacity again. If Samsung is putting its battery budget into the Pro and Ultra specifically, that would match the naming split first flagged in our report on the Galaxy S27 Pro’s tipped Privacy Display, where the Pro started picking up features once reserved for the Ultra alone.
