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First, the temperature is too high, which is manifested as: after the iPhone is charged to about 80%, it stops charging.
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Apple mobile phone is used on the lithium-ion battery, according to the battery principle characteristics, it is still very sensitive to temperature, the normal working environment temperature is 0° to 35° C. If the situation stops after charging to about 80%, the most likely reason is that the iPhone itself or the temperature environment is too high, the system will limit charging after the battery reaches 80% in order to protect the battery from damage.
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If this happens to your device during charging, stop using the device and place it in a cooler place with the charger, such as an air-conditioned room in summer. Place the iPhone on a flat, cool desktop, and the device will continue to charge when the temperature drops.
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Second, hardware problems.
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If this is not the case, you can check whether the connection between the charging cable and the phone is normal and whether the contact is good. If the charger or charging cable has been damaged, it is recommended that you replace the accessories to charge the phone.
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Third, system problems.
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Charging can only be charged to more than 90%, and can not be completed to 100%. A possible system problem cannot be ruled out. You can try to shut down or restart the device, and then continue to charge the device.
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4. Display problem: Calibrate battery display.
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If you have already found that the battery display is not accurate, you can try to calibrate the battery display by referring to the following methods:
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Drain your phone completely until it shuts down on its own, and you can try turning it back on to make sure the battery is fully discharged: after a few seconds, the phone will automatically turn off again and say it is low. Charge the phone to 100% without turning it on, making sure the phone is turned off during the charging process. You can charge for an extra hour after the charge is complete.
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After opening the phone, observe whether the power is displayed as 100% at this time, then disconnect the phone from the charger, unplug the power, and calibration is completed. Then use it as normal as usual.
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If the above methods can not solve your problem, you will still be charged after updating the system, you need to contact Apple after-sales, so that professional technicians can help you detect and deal with it.