System: ISO 14.7
Apple battery lost four health ratios in three days, which is related to personal use habits. If the new Apple phone suddenly loses power, it is abnormal. You can go to Apple's mobile phone after-sales service center for testing.
Under normal circumstances, the decline of 10% within half a year of Apple's mobile phone belongs to normal battery consumption. When Apple's mobile phone prompts that the battery is low, charge it in time to avoid automatic shutdown due to low battery. If the battery efficiency is less than 80%, please try to replace the battery.