Samsung Galaxy S27 battery specs surface in Korean certification database
Pre-production battery units for the upcoming Galaxy S27 Ultra and Pro have appeared in South Korea's Safety Korea certification database. Filings suggest capacities of 5,700mAh and 5,200mAh, respectively, manufactured by Zhuhai CosMX Power. These figures temper earlier rumors of larger silicon-carbon cells, though Samsung has not officially confirmed final specifications, leaving the exact power capabilities of the next flagship series unverified.
Key points
- Samsung, the South Korean electronics giant, has pre-production batteries for its upcoming Galaxy S27 Ultra and Pro models registered in the Safety Korea certification database.
- The filings identify the batteries with model numbers EB-BS958DBY and EB-BS957CBY, suggesting capacities of 5,700mAh for the Ultra and 5,200mAh for the Pro variant.
- Both battery units are manufactured by Zhuhai CosMX Power Jinwan Subsidiary, a China-based supplier, under certification numbers YU10899-26034 and YU10899-26036.
- These confirmed capacities are lower than previous rumors of a 7,000mAh prototype or the adoption of silicon-carbon battery technology for the flagship series.
- Because the units are pre-production, Samsung has not yet finalized the specifications, meaning the certified capacities could change before the official launch.
- The certification provides the first concrete evidence of the power hardware for the S27 series, offering a baseline for expected performance against current models.
Pre-production battery units believed to be destined for Samsung's upcoming Galaxy S27 Ultra and Pro smartphones have been identified in South Korea's Safety Korea certification database. The filings, spotted by Notebookcheck, list two distinct battery models with specific certification numbers, offering the first tangible look at the power components for the next generation of the company's flagship devices.
The database entries identify the batteries by model numbers EB-BS958DBY and EB-BS957CBY. Earlier regulatory filings associated with these units suggest capacities of 5,700mAh for the Ultra model and 5,200mAh for the Pro model. Both components are manufactured by Zhuhai CosMX Power Jinwan Subsidiary, a subsidiary of a China-based power supplier. These figures provide a concrete baseline for the expected hardware, moving beyond speculative rumors.
The certified capacities temper earlier speculation regarding a potential breakthrough in battery technology. Previous rumors had suggested the possibility of a massive 7,000mAh prototype for the Ultra or the adoption of silicon-carbon batteries, which typically offer higher energy density. However, the current certification data points to more modest increases over previous generations. Since these are pre-production units, Samsung has not yet locked in the final specifications, leaving room for adjustments before the official launch. Until the manufacturer confirms the details, the 5,700mAh and 5,200mAh figures remain the most reliable indicators of the phones' power capabilities.
Sources
The WireByte editorial team synthesises technology news from multiple primary sources, verifies the facts, and links every source. Articles are produced with AI assistance and reviewed under our editorial policy.
