Samsung has integrated silicon‑carbon (SiC) batteries for the first time in its new generation of foldables — the Galaxy Z Fold 8 (including an Ultra variant) and the Galaxy Z Flip 8. This hardware change allows the Fold models to increase battery capacity without enlarging the device footprint, while the Flip benefits from a slimmer profile.
Why silicon‑carbon batteries matter
Silicon‑carbon (SiC) battery cells offer higher energy density than traditional lithium‑ion cells: they store more energy in the same volume. That makes it possible to fit larger‑capacity batteries without increasing overall device size, or conversely to reduce chassis thickness while maintaining the same runtime — a valuable trade‑off for space‑constrained foldable phones.
Which models get SiC and the announced specs
Samsung announced three SiC‑equipped models: the Galaxy Z Fold 8 Ultra, the Galaxy Z Fold 8, and the Galaxy Z Flip 8.
– Galaxy Z Fold 8 Ultra: 5,000 mAh battery
– Galaxy Z Fold 8: 4,800 mAh battery (up from 4,400 mAh on the Galaxy Z Fold 7)
– Galaxy Z Flip 8: battery capacity unchanged, but overall thickness reduced to 13.1 mm from 13.7 mm in the previous generation
Context and impact for manufacturers
Since 2023, several Chinese manufacturers have adopted silicon‑carbon batteries while most other brands continued using conventional lithium‑ion cells. Samsung’s move addresses a recurring demand to improve both capacity and compactness — especially important in foldables, where internal space is limited. By using SiC cells, Samsung tackles a core constraint of its foldable line without materially changing the external design.
The introduction of SiC in the Galaxy Z Fold 8 and Z Flip 8 is a tangible step toward optimizing the trade‑off between battery life and thinness in foldable smartphones. The key questions now are how this new cell chemistry will translate into real‑world autonomy and long‑term durability.
