After half a year's use, it is normal that the health surplus is between 85% and 99%, generally around 95%. If it is 100% or less than 80%, it is not normal.
Open the phone to select settings. Click on the battery in the settings. Select View Battery Health.
If your iPhone is a version of the Bank of China and your mobile phone is still under warranty, you can go to Apple to replace a new battery after sale as long as the battery health is lower than 80%. Because in such a short time, Apple's battery health is below 80%, which is an abnormal situation, indicating that this is a battery failure, and Apple will repair and replace the user model for free.