Galaxy S27 Ultra Battery Leak: 5,700mAh Cell [Confirmed]

Samsung Galaxy S27 Ultra and S27 Pro pre-production batteries have officially surfaced in South Korea's Safety Korea certification database, confirming rated capacities expected to reach 5,700mAh and 5,200mAh ahead of the 2026 mobile flagship release window. According to verified reports from Android Authority alongside initial regulatory discoveries from Notebookcheck, regulatory filings identified model numbers EB-BS958DBY and EB-BS957CBY under certification license YU10899-2. While previous community leaks speculated on an unverified 7,000mAh silicon-carbon cell, these physical production units present tangible hardware evidence of Samsung's refined high-density battery strategy. The capacity increase marks a strategic leap over predecessor cells, engineered to supply consistent voltage under extended processing loads. Paired with upcoming operating system advancements documented in the [Samsung One UI 9.5 Beta: Galaxy Update Leak [Confirmed]](/news/samsung-one-ui-95-beta-galaxy-update), the S27 series seeks to solve prolonged mobile thermal bottlenecks. Mobile esports athletes competing in regional circuits require dependable power profiles that eliminate unexpected wattage drops mid-match. These certified units confirm Samsung is testing retail-grade production samples ahead of global distribution lines.