https://www.macrumors.com/2020/10/23/iphone-12-pro-battery-life-test/

„ In the test, the iPhone 11 Pro outlasted both the 6.1-inch iPhone 12 and iPhone 12 Pro, despite being a smaller 5.8-inch device. When the iPhone 12 Pro ran out of battery, the iPhone 11 Pro still had 18% battery life remaining, and when the iPhone 12 powered off, the iPhone 11 Pro still had 14% battery life remaining.
The final rankings ended up as follows:

iPhone 11 Pro Max: 8 hours and 29 minutes
iPhone 11 Pro: 7 hours and 36 minutes
iPhone 12: 6 hours and 41 minutes
iPhone 12 Pro: 6 hours and 35 minutes
iPhone 11: 5 hours and 8 minutes
iPhone XR: 4 hours and 31 minutes
iPhone SE (2020): 3 hours and 59 minutes
These rankings are of course missing the iPhone 12 Pro Max and iPhone 12 Pro mini, which will be available to pre-order starting November 6.“