The battery capacity ratio displayed by the system represents the actual capacity of the battery in the current state. If the value is 85%, it is not necessary to replace the battery with normal performance and function. However, if the maximum capacity ratio of the mobile phone battery reaches 85%, and the battery has expanded or the black screen is automatically restarted at high power, the battery must be replaced.
For example, Apple's battery is generally less than 80% and needs to be replaced. Under normal circumstances, the battery of Apple's mobile phone should be replaced when it drops to 80%, but it does not mean that it must be replaced at this healthy level. You can choose according to your own usage. You can replace the battery 85% of the time. There is no fixed replacement standard, but it is certain that the lower the health level, the less durable the battery will be.
Precautions for battery replacement
The battery health of the new machine will drop to 80% within one year, and it can be replaced for free after the official sale. Moreover, Apple has an implicit warranty condition. If the battery of the machine swells within two years after purchase, it can be returned to the factory for a new one, and there is no need for third-party maintenance or artificial loss.
However, for more than a year, the official battery maintenance cost is not a small sum. If the official price is too high, you can choose to go to a professional repair shop and replace the battery certified by a third party. However, on the models above iPhone XR, because Apple encrypts the mobile phone battery, a 15-day window will pop up after replacing the battery, and there will be a hint that this iPhone battery cannot be verified as Apple's genuine battery.