Samsung’s upcoming flagship series is taking its next major step toward release. The Samsung Galaxy S27 Pro and Galaxy S27 Ultra have been seen making the regulatory certification rounds, and their actual battery units have surfaced in the South Korea safety department database, complete with official testing photographs.
Certification Photos and Part Numbers
The newly leaked certification listings reveal two distinct battery model designations:
- EB-BS957CBY: Corresponds to the Galaxy S27 Pro (model number
SM-S957) - EB-BS958DBY: Corresponds to the top-tier Galaxy S27 Ultra (model number
SM-S958)
Both cells are manufactured in China by CosMX Zhuhai, one of Samsung’s established battery suppliers. While exact printed electrical ratings are obscured by regulatory labels and reflections in the certification shots, earlier regulatory filings have already confirmed the precise hardware parameters.
Capacity Upgrade: Up to 5,700 mAh and 60W Fast Charging
The battery capacities first leaked in July via China’s 3C certification database and were verified again in September filings:
- Galaxy S27 Ultra: Rated at 5,534 mAh, which typical marketing figures translate to 5,700 mAh.
- Galaxy S27 Pro: Rated at 5,087 mAh, which converts to a typical capacity of approximately 5,200 mAh.
- Charging Speed: Both flagships support 60W wired fast charging, advancing on previous generation profiles.
If these final production specs hold true, the Galaxy S27 Ultra will offer a substantial 700 mAh boost compared to the 5,000 mAh threshold Samsung has fielded for multiple generations.
Breaking the 5,000 mAh Barrier: S Pen vs. 7,000 mAh Prototype
Samsung has maintained a standard 5,000 mAh capacity ceiling on its Ultra lineup for years, prioritizing internal volume for the built-in S Pen digitizer and advanced periscope telephoto optics. Industry reports reveal that Samsung engineers internally evaluated prototype chassis hosting cells as high as 7,000 mAh.
However, fitting a 7,000 mAh battery would have necessitated removing the internal S Pen silo or noticeably thickening the device profile. Samsung opted for a balanced 5,700 mAh configuration—delivering markedly longer battery endurance while keeping the integrated S Pen and refined industrial footprint intact.
Expected Launch Window
While Samsung has not officially announced an Unpacked date, historical certification timelines suggest the Galaxy S27 family is tracking toward a release in the January or February 2027 timeframe. With safety certifications now wrapping up in key Asian markets, mass component production is right on schedule.
Frequently Asked Questions
What battery models were verified in the certification database?
The certified batteries are model numbers EB-BS957CBY and EB-BS958DBY, matching the upcoming Galaxy S27 Pro (SM-S957) and Galaxy S27 Ultra (SM-S958).
What are the rated and typical capacities for the S27 series?
The S27 Ultra features a 5,534 mAh rated capacity (typically marketed as 5,700 mAh), while the S27 Pro has a 5,087 mAh rated capacity (typically 5,200 mAh).
How much larger is the S27 Ultra battery compared to earlier Ultra phones?
The S27 Ultra delivers a 700 mAh increase over traditional 5,000 mAh units, representing Samsung’s biggest single-generation capacity leap in the Ultra category.
When will Samsung officially unveil the Galaxy S27 series?
Supply chain and regulatory schedules point toward Samsung’s annual early-year Galaxy Unpacked event in late January or early February.