Samsung has launched the past few generations of its S series bar flagships and foldables with mostly iterative upgrades. The Galaxy S25 Ultra followed that pattern, offering minor changes over the S24 Ultra — such as rounded corners, a slightly upgraded ultrawide camera, and of course, a new chipset.
Earlier speculation suggested that Samsung might finally adopt high-density silicon-carbon battery tech in the Galaxy S26 series to deliver a big leap in battery capacity. But industry insiders later advised tempering expectations, claiming the capacity likely wouldn’t exceed 5,500mAh. Now, the latest leak paints an even less optimistic picture.
According to X tipster @PandaFlashPro, the battery capacity hasn’t been finalized yet, but it’s currently “under 5,400mAh” — if it increases at all. This opens up the possibility that the S26 Ultra could once again feature the same 5,000mAh battery. While the Galaxy S25 Ultra holds up in battery drain tests, software optimization alone can’t match competitors boasting 6,000mAh+ silicon-carbon batteries, especially since those devices also use the latest and most efficient chips.
Charging speeds aren’t improving much either. While Chinese flagships now routinely offer 80W+ wired and 50W wireless charging, Samsung has stuck with 25W or 45W wired and just 15W wireless. Calling that “fast” in 2025 feels like a stretch. There had been speculation around 65W wired charging for the Galaxy S26 Ultra, but the tipster now says “not 65W.” That doesn’t rule out a modest bump — perhaps to 50W — but it’s far from a game-changer.
That said, Samsung will likely once again market its Ultra flagship as “the best Galaxy ever” when it launches in Q1 2026. Stay tuned, as more leaks are sure to emerge as we inch closer to the reveal.
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