Chosen Solution
wanna know if the iPhone XR and the iPhone 11 are compatible to do battery swaps, cause the 11 has more battery juice than the XR
Hi The short answer is no. They are different batteries with different voltages that require different charging and battery management circuits. The battery was designed/selected for the phone that it is installed in. Also a good clue is if they same the same model number or not. If not then there may be more differences e.g. battery flex cable pinout etc Here’s some images taken from the ifixit iPhone 11 Battery Replacement guide and the iPhone XR Battery Replacement guide showing the info from each battery.
(click on image)