Apple iPhone 15 has set a charging limit of 80%, why does it still charge to 100%?

Since iOS 13, Apple has added the "Optimize Battery Charging" function to the iPhone, with the purpose of reducing battery loss and extending battery life by shortening the time to fully charge.

#After enabling this feature, iPhone will intelligently manage the battery charging status based on your daily charging habits. When iPhone predicts that it will be connected to the charger for an extended period of time, it uses on-device machine learning to suspend charging above 80% to protect battery life and improve long-term battery performance. The purpose of this feature is to avoid leaving the battery charged at full charge for long periods of time, as overcharging can have a negative impact on the battery. By optimizing battery charging, iPhone can better meet your daily use needs and extend battery life.

##In the iPhone 15 series models, Apple has added a new “80% upper limit ” option to charge the iPhone up to about 80% and then stop charging.

However, some users found that when using iPhone 15 series models, even if they have been set With the 80% charging limit, the iPhone will still be fully charged to 100%.

In this regard, users can check whether the iPhone 15 has been upgraded to iOS 17.1 or newer, because there is a bug in the previous version that may cause the system to ignore charging restrictions.

For iPhone 15 series model users who have upgraded to a newer version, if they find that the charge is still full to 100%, there is no need to worry too much about this problem. Apple's official support document explains: When "80% cap" is enabled, the iPhone will occasionally charge to 100% in order to maintain an accurate battery state-of-charge estimate. Therefore, this is not a battery abnormality problem, and you can continue to pay attention to the subsequent charging of the device.

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