Recent reports suggest the Samsung Galaxy S27 Ultra may finally move beyond the long-running 5,000mAh battery setup used in earlier Ultra models. The rumor points to a larger cell, with some leaks saying it could exceed 6,000mAh.
Other speculative claims mention silicon-carbon battery prototypes and much larger test capacities, but those figures appear to be development samples rather than confirmed retail specs.
The claim that the S27 Ultra could surpass the iPhone 18 Pro Max in battery capacity is still unconfirmed. I don’t have a verified battery figure for the iPhone 18 Pro Max here, so that comparison should be treated as a rumor rather than a fact.
If Samsung does ship a battery above 6,000mAh, it would be one of the biggest battery upgrades in the Ultra series in years. That could help narrow the gap with phones that already emphasize endurance and fast charging.
At this stage, the safest way to read the story is that Samsung’s next Ultra is expected to get a bigger batterynot that the final retail device is confirmed to beat every rival. Leaks can change before launch, especially for unreleased flagships
