Samsung might finally be getting serious about fixing one of its biggest weak spots in the flagship space: battery tech. Fresh leaks suggest the company is making real progress on silicon-carbon (Si-C) batteries, and the Galaxy S27 Ultra is now being tipped as the phone where this upgrade could actually show up.
For a while now, Samsung has been trailing behind a few Chinese brands that have already moved to Si-C cells. The advantage is higher energy density, meaning you can fit more capacity without making the phone thicker. In comparison, the Galaxy S26 Ultra is still stuck with a 5,000mAh battery.
New details, reportedly from Samsung SDI documents shared via the Schrodingerintel blog, give a clearer picture of what’s being tested internally. The company has apparently been experimenting with silicon-carbon batteries ranging from 12,000mAh all the way up to 20,000mAh.
One of the more interesting configurations mentioned is a dual-cell setup labeled SDI-DC12K-SiC-V2. It combines a 6,800mAh cell (around 4.7mm thick) with a 5,200mAh cell (about 3.2mm). The 6,800mAh cell or a similar version of it could realistically fit inside the Galaxy S27 Ultra without going overboard on thickness.
The bigger issue, though, seems to be longevity. The 20,000mAh setup reportedly managed around 960 charge cycles before failing. That’s quite a bit short of the ~1,500 cycles expected for commercial use. And that gap likely explains why we didn’t see this tech make it into the S26 series.
From what’s being said, Samsung engineers are now working on improving things like separator materials, stacking techniques, and battery management to get those numbers up to a usable level.
Interestingly, Samsung has already admitted it’s behind in battery tech. That alone kind of hints that a shift is coming sooner rather than later. If the South Korean giant manages to sort out the durability issues in time, the S27 Ultra could end up being a pretty big moment for Galaxy fans.
(Source)
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