Most people use it for one year before the battery health begins to decline significantly. Apple’s official website battery health replacement guide also points out that after 500 to 800 recharges of the iPhone’s battery, the battery’s life may drop to 80%. When it is close to or below 80%, it will be found that the iPhone has abnormal power consumption, and the battery should be replaced at this time.
In addition, Apple's official website also explained in detail that there are 4 tips to "maximize" battery life:
1. Update the software to the latest version: Software updates will also improve energy-saving technology.
2. Avoid extreme ambient temperature: 16 degrees C to 22 degrees C is the most ideal temperature range, avoid exposing the device to an environment above 35 degrees C, otherwise it may cause permanent damage to the battery.
3. Remove some protective covers when charging: charging in a protective cover may cause the device to overheat and affect the battery's capacity.
4. When storing for a long time, the battery should have half the charge capacity: if you plan to store the device for more than six months, it is best to maintain a 50% charge. A full charge may shorten the battery life, and a full discharge may cause it not be recharged later.