Samsung plans to expand silicon‑carbon (Si‑C) batteries beyond its recent foldables, Moon Sung‑hoon, VP of hardware for the MX division, said — while confirming that Si‑C adoption for the upcoming Galaxy S27 will depend on the real-world benefits the technology delivers to users.
Why the Si‑C battery is a game changer
The silicon‑carbon (Si‑C) battery offers higher energy density than conventional lithium‑ion cells, enabling larger capacities in thinner chassis. Samsung recently introduced Si‑C cells in its latest foldables — the Galaxy Z Fold 8, Z Fold 8 Ultra and Z Flip 8 — allowing increased capacity for the “book” form factors and a slimmer profile for the “clamshell” model without sacrificing battery life.
What Samsung said about the Galaxy S27
Speaking at a conference in London, Moon Sung‑hoon explained that the decision to roll Si‑C batteries out to slab‑style phones like the Galaxy S27 will be made on a case‑by‑case basis: “We will decide whether to apply this technology per product, if the battery can help improve the customer experience.” In short, Samsung is open but cautious — integration will be judged against concrete trade‑offs in battery life, device size and cost.
Possible scenario for the S27 Ultra
Previous reports indicate Samsung is already testing Si‑C batteries for the S27 series. If those tests succeed, the Galaxy S27 Ultra could break past the 5,000 mAh mark and reach roughly 5,500 mAh — a notable step for the S lineup aimed at boosting endurance without compromising design.
The rollable: ongoing research and internal timeline
On the rollable phone front, Moon said Samsung has “been researching this technology for a long time” and continues working to mature it for commercialization. Procurement talks with Samsung Display have already begun, and industry rumblings point to an internal target window in the first half of 2028. Samsung has not confirmed any public launch timeline.
Bottom line
Samsung is pursuing two parallel hardware paths: potential expansion of Si‑C batteries into the Galaxy S family based on user‑experience gains, and continued development of a rollable smartphone whose release will hinge on technical maturity and internal product decisions. Final outcomes will depend on ongoing test results and product trade‑offs.
