Samsung's latest Galaxy Z8 series of foldable smartphones, including the Z Fold 8, Z Fold 8 Ultra, and Z Flip 8, feature a significant battery upgrade thanks to the adoption of silicon-carbon battery technology. This marks Samsung's first lineup to utilize this advancement, following competitors like One Plus, Oppo, Xiaomi, and Honor.

Silicon-carbon batteries allow for higher energy density, meaning larger battery capacities can be fitted into the same physical space without increasing device thickness. A prime example is the Galaxy Z Fold 8 Ultra, which sees its battery capacity jump from 4,400mAh to 5,000mAh while maintaining a similar form factor.

This move to silicon-carbon technology is a notable enhancement for Samsung's foldables, potentially addressing limitations seen in previous generations. The cautious implementation may also be influenced by the Galaxy Note 7 battery incidents in 2016, suggesting Samsung prioritized thorough validation before integrating the technology into its flagship devices. This battery upgrade is considered one of Samsung's most substantial in recent years.