Tech
Samsung admits its foldables need Si-C batteries, but won't commit to what matters
In July 2026, Samsung introduced silicon-carbon battery technology in its Galaxy Z Fold 8, Fold 8 Ultra, and Flip 8.
Key takeaways
- Samsung shipped silicon-carbon batteries for the first time in the Galaxy Z Fold 8 and Flip 8
- EPREL filings rate the silicon-carbon cells in the new foldables at roughly 1,200 charge cycles before dropping to 80% health
- The previous graphite battery in the Z Fold 7 achieved a 2,000-cycle rating
- Xiaomi's Redmi Note 17 Pro offers a free five-year battery upgrade guarantee if health drops below 80% in the first four years
In July 2026, Samsung introduced silicon-carbon battery technology in its Galaxy Z Fold 8, Fold 8 Ultra, and Flip 8. While this allows for higher capacities in thinner bodies, European Product Registry for Energy Labelling (EPREL) filings show these cells are rated for roughly 1,200 charge cycles before dropping to 80% health, down from the 2,000-cycle rating of the graphite-based Z Fold 7. This degradation curve contrasts with Samsung's seven-year software update promise, especially since standard battery coverage expires after 12 months.
By the numbers
- 1,200
- charge cycles before silicon-carbon cells drop to 80% health
- 2,000
- charge cycles achieved by the graphite battery in Z Fold 7
- 300%
- expansion of pure silicon when absorbing lithium ions
- 4.1mm
- unfolded thickness of the Galaxy Z Fold 8 Ultra
- $1900
- starting price of the Samsung Galaxy Z Fold 8
How it unfolded
- Samsung ships silicon-carbon batteries in London; Xiaomi launches Note 17 Pro.
Why this matters
-
Samsung is reportedly testing the same silicon-carbon cells for the Galaxy S27 lineup
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Common questions
- What happened with Samsung Galaxy Z Fold 8 and Flip 8?
- Samsung shipped silicon-carbon batteries for the first time in the Galaxy Z Fold 8 and Flip 8
- Where can I read the original report?
- Read the full report at android_police.
