Full Breakdown
Samsung Galaxy S27 Ultra and Pro: Battery Capacity Gains Confirmed in China’s 3C Filings
By Drooid · · How we work
Core Event – Battery and Charging Specs Confirmed
China’s 3C certification agency lists the upcoming Galaxy S27 Ultra (model SM-S958) with a rated capacity of 5,534 mAh, translating to an advertised 5,700 mAh. The Galaxy S27 Pro (model SM-S957) shows a rated 5,087 mAh, corresponding to 5,200 mAh. Both are certified for 60 W wired fast charging (20 V/3 A), the same speed as the S26 Ultra.
Background & Context – From Si-C Cells to Competitive Pressure
Samsung first used silicon-carbon (Si-C) cells in the Galaxy Z Fold 8 and Flip 8, enabling higher energy density without larger cells. The S27 filings suggest the S-series will now use the same chemistry. The S26 Ultra (2026) kept a 5,000 mAh battery and 60 W charging, marking a period of stagnant capacity growth.
Chinese rivals are offering larger packs; the Oppo Find X10 is rumored with an 8,000 mAh battery and many OEMs certify 100 W or higher charging. Samsung’s new capacities therefore represent a notable step forward.
Data & Statistics – Numbers at a Glance
| Device | Model | Rated Capacity (mAh) | Expected Advertised Capacity (mAh) | Wired Charging (W) |
|---|---|---|---|---|
| Galaxy S27 Ultra | SM-S958 | 5,534 | 5,700 | 60 |
| Galaxy S27 Pro | SM-S957 | 5,087 | 5,200 | 60 |
| Galaxy S26 Ultra (2026) | — | 5,000 (advertised) | 5,000 | 60 |
The Ultra’s jump of roughly 700 mAh (?14 %) is the largest since the S21 Ultra’s 5,000 mAh battery in 2021.
Official Statements & Responses – Regulatory Confirmation
The 3C agency’s certification entries are publicly searchable and serve as the primary source for these figures. Samsung has not issued a press release, and marketing materials are still pending, but the listings are generally treated as reliable indicators for Chinese-market hardware.
Conflicting Reports & Gaps – Unverified Endurance Claims
All sources agree on the rated capacities and 60 W charging limit. Actual endurance will depend on software optimization and real-world usage, which have not been tested publicly. Samsung’s global launch timeline and final advertised specs may differ from the Chinese filings, creating a gap between regulatory data and consumer-facing information.
What’s Next – Launch Timeline and Market Position
The Galaxy S27 series is slated for an early 2027 launch, according to leak aggregators. Samsung is expected to continue omitting a charger from the box, a practice started with the S26 Ultra. If the larger batteries deliver longer screen-on time, the Ultra and Pro could narrow the gap with Chinese competitors, though the unchanged 60 W charging ceiling may keep Samsung behind rivals offering 100 W or faster solutions.
Future updates from Samsung—including official specifications, pricing, and regional availability—will confirm whether the regulatory filings fully reflect the final consumer products.