iPhone XR Max Battery Capacity for Warranty Replacement
What is the level in iPhone Settings>Battery>Battery Health>Maximum Capacity to have the battery replaced under warranty for the XR/XS/XS Max?
iPhone XR
Apple documents state an iPhone battery should retain 80% of original capacity at 500 full discharge/charge cycles - iPhone Battery and Performance - Apple Support. As long as it is within those specs it has not failed prematurely by those terms and would not be replaced under warranty.