Samsung is testing silicon-carbon batteries: the 12,000 and 18,000 mAh versions pass, while the 20,000 mAh version did not pass the tests

Samsung still does not release silicon-carbide batteries, but is already conducting tests

*Silicon‑carbide (SiC) batteries differ from traditional lithium‑ion ones by higher energy density: at the same size they provide greater capacity.*

OnePlus 15 uses a SiC battery of 7300 mAh, while Samsung Galaxy S26 Ultra has only 5000 mAh.

What has already been tested
- Two months ago the company conducted tests on a 20,000 mAh battery but postponed its release in favor of lower‑capacity cells.

- At the end of last year it became known about another experimental battery with two cells:

- 12,000 mAh (thickness 6.3 mm)

- 8,000 mAh (thickness 4 mm).

- This battery stopped working after 960 charge cycles, while ordinary lithium‑ion batteries are rated for 500–1,000 cycles.

- As a result Samsung halted testing of the 20,000 mAh and chose a “safer” option.

Current research
Samsung continues to test SiC batteries with capacities of 12,000 and 18,000 mAh:

Capacity (mAh) Cell options
12,000 6800, 5200
18,000 6699, 6000, 5257

Why this matters
- Lesson from Galaxy Note 7. After the battery explosion incident Samsung became more cautious and now thoroughly tests new technologies.

- SiC batteries promise longer device runtime without increasing size, which is especially relevant for flagships.

Thus, although silicon‑carbide batteries are not yet in mass production at Samsung, the company actively explores their potential and gradually prepares for possible implementation in future models.