Apple is notoriously tight-lipped on the subject of its new iPhones' batteries and their exact specs. Now, however, this mystery is being gradually solved through online testing. The latest of these may reveal capacity for the Pro variant of the 13 series, while also providing a teardown for the device and a comparison with its direct predecessor.
https://www.notebookcheck.net/iPhone-13-Pro-a-teardown-channel-purports-to-reveal-its-battery-capacity-in-mAh.565588.0.html