A battery believed to belong to the Galaxy S27 Pro has appeared on India’s Bureau of Indian Standards (BIS) portal, carrying part number EB-BS957CBY a number that lines up directly with the S27 Pro’s rumored model number, SM-S957. It’s a small piece of evidence on its own, but it adds to a growing paper trail suggesting Samsung really is preparing a fourth S27 model to sit between the S27+ and the Ultra.
It’s worth being precise about what this listing actually confirms. BIS certifies the battery cell itself, not the phone, so it doesn’t officially verify capacity, charging speed, display, or chipset; it mainly confirms that a device using this specific battery exists and is far enough along to need regulatory testing. The battery capacity numbers floating around, a rumored 5,200mAh with silicon-carbon technology, come from earlier separate reporting, not from anything BIS discloses.
| Detail | Status |
| S27 Pro existence | Reported, not officially announced |
| Model number | SM-S957 |
| Battery listed | EB-BS957CBY (BIS, India) |
| 60W charging | Reported via earlier 3C certification |
| 5,200mAh battery | Rumored |
| Display | 6.47″ AMOLED, M16 panel rumored |
| Chipset | Snapdragon 8 Elite Gen 6 or Exynos 2700 rumored |
| Software | Android 17 / One UI 9.5 expected |
| Launch | Early 2027 expected |
The BIS listing follows an earlier 3C certification out of China that pointed to 60W wired charging for the S27 Pro, the same ceiling reportedly expected on the Galaxy S27 Ultra, putting both above the S27+’s rumored 45W and the standard S27’s 25W. Between the two certifications, Samsung’s charging tiers for the four-phone S27 lineup are starting to look fairly settled, even without Samsung confirming any of it directly.
The bigger story here isn’t really the battery number, it’s what a Pro-tier battery cell showing up in a government database says about how far along the project is. Samsung reportedly positioning the Galaxy S27 Pro as a genuinely new tier, rather than just a renamed Plus model, has been backed up by a steady stream of small leaks like this one over the past few months, even as Samsung itself stays silent on the phone’s existence.
M Adnan Akram is the founder and lead writer at Phoonomo, covering mobile technology with a primary focus on Apple and the broader smartphone industry, alongside emerging developments in AI. He follows product launches, spec leaks, and industry trends closely to keep readers informed with timely updates.
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