According to a recent listing on a Korean safety portal, the Galaxy S11+ might feature a 5000 mAh battery. A clear picture of the battery highlights its capacity, while the part listing correlates to S11+'s model number. Samsung fans might have an multi-day performer to look forward to.
https://www.notebookcheck.net/5000-mAh-Galaxy-S11-Plus-battery-spotted-on-Korean-certification-portal.446088.0.html