https://wccftech.com/galaxy-z-fold-4-battery-leaks-through-korean-certification/

The Galaxy Z Fold 4 is expected to arrive with several changes compared to its direct predecessor, including a possible change in the battery capacity. With the latest leak coming through a certification website, we get a first glance at the cell powering the upcoming foldable flagship’s innards, but the essential details remain elusive.

The Galaxy Z Fold 4 is rumored to be smaller and thinner than the Galaxy Z Fold 3, so as a result of that size reduction, not only is the S Pen getting ditched, but the flagship may feature a smaller battery. Unfortunately, while the battery has been spotted on a certification website called Safety Korea, important details like the overall capacity, rated capacity, and voltage have not been mentioned.