Recent leaks reveal that the Galaxy Z Fold8 (previously named Galaxy Z Fold Wide) and Galaxy Z Fold8 Ultra (the direct successor to the Galaxy Z Fold7) are set to feature significantly larger batteries compared to their predecessors. Some reports indicate that Samsung is finally embracing Si/C battery technology. But how much of an improvement in battery life can we expect?

To fully understand the enhancements, thorough testing will be conducted once the first review units are available. However, the insights from the European regulatory bodies provide a promising outlook on battery endurance.
The European Product Registry for Energy Labeling (EPREL) has released the endurance ratings for both the Galaxy Z Fold8 and Galaxy Z Fold8 Ultra, which are 49:10h and 51:00h, respectively. These scores were achieved with 4,800 mAh and 5,000 mAh batteries.
When comparing the Galaxy Z Fold8 Ultra to its predecessor, the Galaxy Z Fold7, which carries a rating of 40:28h and a 4,400 mAh battery, we see a notable endurance improvement of approximately 20%.
Your actual usage may vary, as individual phone habits differ; nonetheless, it's clear that the new Galaxy Z Fold8 series will come equipped with larger batteries—a highly anticipated upgrade.
Via