Updated

Updated · Notebookcheck.net · Oct 22

Samsung Galaxy S27 Ultra, Pro Batteries Clear Safety Korea With 5,534 mAh and 5,087 mAh Ratings

Updated

Updated · Notebookcheck.net · Oct 22

Samsung Galaxy S27 Ultra, Pro Batteries Clear Safety Korea With 5,534 mAh and 5,087 mAh Ratings

Q: With a massive 5700 mAh capacity but stagnant 60W charging, will the Galaxy S27 Ultra take significantly longer to fully charge?

Probably not significantly longer, but likely a bit longer unless Samsung’s rumored charging optimizations are real. On paper, a move from the Galaxy S26 Ultra’s 5,000 mAh battery to roughly 5,700 mAh on the S27 Ultra is about a 14% increase in capacity. If charging power truly stays capped at 60W and the charging curve is unchanged, a larger battery would normally take longer to fill. That said, peak wattage is only part of the story. Phones rarely hold maximum charging speed for the full session; they taper to protect battery health and control heat. A recent leak claims Samsung has improved the S27 Ultra’s charging management so it can sustain roughly 55W–56W for longer, delivering a modest 2%–3% improvement versus the S26 Ultra. If that is accurate, it would offset some of the time penalty from the bigger battery, but probably not eliminate it entirely. Using the widely cited estimate of around 45 minutes for a full 60W charge on the S26 Ultra, a 14% bigger battery with no other changes could imply several extra minutes. With better sustained charging, the increase may end up being fairly small in real use rather than dramatic. The key point is that 60W alone does not determine total charging time. Battery chemistry, heat control, and how long the phone can stay near peak power matter just as much. Since these certifications cover pre-production units, final retail charging behavior could still change.

3 articles · Updated · Notebookcheck.net · Oct 22

Safety Korea certified Samsung batteries EB-BS958DBY and EB-BS957CBY, covering the Galaxy S27 Ultra and Galaxy S27 Pro under filings YU10899-26034 and YU10899-26036.
China's earlier 3C filing points to rated capacities of 5,534 mAh for the Ultra and 5,087 mAh for the Pro, implying typical capacities of roughly 5,700 mAh and 5,200 mAh.
Those figures would mark a notable jump from the Galaxy S26 Ultra's 5,000 mAh battery, while wired charging appears unchanged at 60 W for both new models.
Zhuhai CosMX Power's Jinwan subsidiary in China manufactures both batteries, though the certified units are pre-production samples and Samsung still has not announced pricing or availability.