Regarding the battery efficiency of Apple mobile phones, you can refer to the following points:
Generally, the cycle life of mobile phone promotion refers to: after being fully charged and discharged for XXX times, the capacity remains 80%. The charge and discharge times are about 500-800 times, and everyone is trying to achieve higher.
The experimental conditions are more severe than the daily conditions of users, because it is difficult to achieve 0% to 100% per charge, so the actual life will be longer than the nominal life of the manufacturer.
However, the mobile phone software can't measure the remaining capacity of the mobile phone, which is all algorithm estimation; If you really want to test, you still have to go to the machine to test the whole body discharge ability.
Therefore, the remaining capacity measured by the software includes the battery health in the iPhone settings. Don't take it too seriously, just look and smile. If it really doesn't work, then change the battery.