The battery health of Apple mobile phone can directly indicate the health status of the battery, and the battery has a built-in encryption chip. When the battery of the Apple mobile phone used by the user has been replaced, or the battery health is equal to or lower than 80%, the word maintenance will be displayed. If your Apple mobile phone battery shows maintenance, it may indicate that your battery health is below 80%, or your mobile phone battery has been replaced by unofficial channels. In this case, you can choose to go to Apple to replace the battery after sale. If your equipment is still under warranty, replacing the battery may be free; If it is not within the warranty period, you may have to pay a certain fee. However, the decline in battery health does not mean that the battery has been damaged, but that the battery life has been reduced. If your mobile phone doesn't have problems such as being unable to charge and consuming power too fast, you can still choose to continue using it.