After four months of use, the battery health of Apple's mobile phone is 98%, which is within the normal range. It is normal that the battery capacity of a new mobile phone will gradually decrease during use. According to the official information released by Apple, the battery life of iPhone usually reaches about 80% health after 400 to 500 full charge and discharge cycles. Each complete charge and discharge cycle refers to using the mobile phone from 100% to 0%, and then filling it up.