Normal. 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.
Worth buying. Apple battery health 9 1 normal, indicating that the battery life has been damaged, but it will not affect the use if it is not replaced. The design life of Apple's mobile phone battery is generally about 500 cycles, and there will be obvious battery loss after one year of normal mobile phone.
Apple 13 is only charged to 9 1% because your battery is no longer healthy. But generally speaking, it is recommended not to charge the battery too full in daily use, because there may be a cycle of charging and discharging after each charge, which will lead to the decline of battery health.
Normal, the battery itself is consumables, and it is normal to be damaged after long-term use. If you don't want to consume too fast, you can turn on the function of optimizing battery charging, and don't charge while playing high-power applications (such as games).