Samsung’s upcoming Galaxy S27 Ultra and S27 Pro are set for battery boosts, according to newly surfaced regulatory data. The leak reveals both phones will ship with larger rated capacities, pushing up advertised numbers too — a meaningful move after several years of incremental tweaks rather than big strides.
Battery Increases: How Much More Power?
The Galaxy S27 Ultra is listed with a rated battery capacity of 5,534 mAh, which generally translates into an advertised capacity around 5,700 mAh. That’s roughly a 700 mAh gain over its predecessor. Meanwhile, the S27 Pro’s battery is listed at 5,087 mAh, likely bringing advertised specs to about 5,200 mAh.
To put that in perspective, the current Galaxy S26 Ultra’s advertised capacity sits near 5,000 mAh (with a rated 4,855 mAh). For the S27 Pro, this would represent a massive upgrade over the S26 Pro’s battery, which is around 4,300 mAh — all while keeping a similar physical size.
Charging Speeds & Market Context
Both the S27 Ultra and S27 Pro are also tipped to support 60W wired charging. That aligns the Ultra with its high-end peers and improves over past Samsung models that often lagged behind rivals in wired charge speeds.
Still, these upgrades aren’t happening in a vacuum. Other Android manufacturers are rumored to be pushing battery sizes even further. Foldable and phablet-style phones powered by newer silicon-carbon batteries are venturing into 6,000-7,000 mAh territory, and one upcoming model is expected to ship with around 8,000 mAh.
So while Samsung’s increases are meaningful, they’re more evolutionary than revolutionary — especially given the stiff competition in the Android flagship space.
These figures are sourced from regulatory filings, not company confirmation. Rated capacity is the actual tested size, which tends to be lower than advertised, so real world battery life may depend heavily on how efficient Samsung’s next chips, display panels, and software turn out to be.
What to Watch For: whether these larger batteries lead to noticeably better endurance under heavy use; how thermal performance is managed; and whether Samsung sticks with 60W wired charging, or pushes to faster or wireless charging gains.
Note: All numbers are from leaks — until Samsung’s official launch, they should be viewed as well-informed estimates.
The upgrades signal that Samsung is responding to growing pressure from rivals and user demand for longer-lasting devices. But they also reveal how difficult genuine battery innovation remains. With rivals pushing into 6,000-8,000 mAh, Samsung’s new batteries look competitive — but those high-numbers set a high bar. Endurance, charging convenience, and thermal stability will ultimately determine whether these upgrades are enough to satisfy power users.
