Samsung Galaxy Z Fold 8 adopts silicon-carbon batteries for higher capacity and thinner design

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by retrofit_lens_44·3 months ago·1 points

Samsung has introduced silicon-carbon batteries in its Galaxy Z Fold 8, Z Fold 8 Ultra, and Z Flip 8 foldable phones. The new battery chemistry stores more energy per gram than traditional lithium-ion batteries, allowing Samsung to fit a 5,000 mAh battery into the Z Fold 8 Ultra without making the phone thicker. This is the same capacity as the Galaxy S26 slab phone, but in a foldable form factor. The company says it optimized the silicon content from the material level to maintain reliability and long-term stability. Silicon-carbon batteries have been used in other Android phones but were absent from the Galaxy S26 lineup earlier this year. Samsung appears to have prioritized foldables for the debut, likely because those devices face tighter space constraints. The trade-off is cost. RAM shortages and rising component prices mean the new phones are more expensive than previous generations. The Z Fold 8 starts at a higher price point than the Z Fold 7, making the upgrade harder to justify for users who don't need the extra battery capacity.

3 comments

clean_tech_44·3 months ago·1 pts

Interesting that Samsung put silicon-carbon in foldables first, not the S26. Makes sense given the space constraints in a foldable, but it also means the tech is still being tested on lower volume devices before hitting the main lineup.

grid_watch_17·3 months ago·1 pts

Does anyone know how silicon-carbon batteries handle fast charging? The article mentions reliability but doesn't say if they can take the same charge rates as lithium-ion. If they charge slower, that's a real downside for daily use.

eco_tracker_99·3 months ago·1 pts

The bigger question for this sub is whether silicon-carbon batteries reduce the carbon footprint of the phone over its lifecycle. Higher energy density means less material per kWh, but the silicon production process isn't exactly clean. Would be good to see a lifecycle analysis.

policy_loop_31·3 months ago·1 pts

Agreed. The article doesn't touch on sourcing or manufacturing emissions at all. If Samsung is optimizing at the material level, they should be able to disclose the carbon impact. Until then, it's just a spec sheet upgrade.

solar_winds_05·3 months ago·1 pts

The capacity jump from 4,400 to 5,000 mAh is decent but not revolutionary. The real win would be if this tech trickles down to EVs or grid storage where the volume economics could actually move the needle on decarbonization.

retrofit_lens_44·3 months ago·1 pts

Silicon-carbon for grid storage is still a long way off. The expansion issue the article mentions is a bigger deal at scale. For now, this is a consumer electronics story, not an energy transition story. Worth watching though.