But it may not be completed in one charge, so you only need to charge it in time when there is no electricity, and don't wait until the power is less than 20% before recharging. However, after each charge cycle, the maximum capacity of the battery will be slightly reduced. At least 80% of the original battery capacity can be maintained after completing multiple charging cycles. If it is further reduced, the battery needs to be replaced in time.
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The decrease of battery health is due to the decrease of the maximum capacity of the battery after charging and discharging for a certain number of times, which is irreversible, that is, the decrease of the maximum capacity of the battery cannot be reactivated to the maximum capacity by simply charging and discharging or not replacing the battery.
You need to turn off the function of optimizing battery charging. On iPhone 1 1, you can open the system settings page of the mobile phone, click the battery option, then click the battery, select "battery health" and turn off "optimize battery charging" to complete the operation. Optimizing the battery charging function will automatically learn the user's charging habits. When charging to 80%, the charging speed will be reduced, resulting in the phone can not be directly charged to 100%.