Why can't my iPhone reach full charge when charging? How to fix this problem?

When charging their iPhone, some users may find that after charging for a period of time and the phone's battery reaches 80% or above, the charging speed begins to slow down and it feels like it is not fully charged.

This situation is usually caused by the iOS system automatically enabling the "Optimize Battery Charging" function. This feature works to reduce battery drain and extend battery life by reducing the time your iPhone is fully charged.

With this feature enabled, iPhone will delay charging past 80% in some cases. iPhone uses on-device machine learning to learn your daily charging habits and enables Optimized Battery Charging only when iPhone determines that it will be connected to a charger for an extended period of time. This algorithm is designed to ensure that your iPhone remains fully charged when the charging cable is unplugged.

Users can manage this feature in iPhone Settings-Battery-Battery Health-Optimize Battery Charging.

When Optimize Battery Charging is enabled, a notification appears on the Lock screen indicating when your iPhone will be fully charged. If you need to charge your iPhone as soon as possible, just press and hold the notification and tap "Charge Now."

If after waiting for a long time, the iPhone still cannot be fully charged:

1. Check whether the iPhone is overheating. Your iPhone may become somewhat warm while charging. To extend battery life, if the battery becomes too hot, the software may limit charging above 80% charge. When the temperature drops, the iPhone will charge again. Try moving your iPhone and charger to a cooler location.

In addition, if the temperature is low, the iPhone or iPad may not be able to charge. You need to place the device in a place with a slightly higher temperature and try to charge again.

2. Try changing the charging cable or charging socket, restart the device and then try to continue charging.

3. If the iPhone cannot be charged or charges very slowly after upgrading, downgrading, flashing or jailbreaking, it is likely that there is an iOS system failure.

If an iOS system failure occurs, it is recommended to use Apple mobile phone repair tools to repair iOS.

If the device still cannot be fully charged or other abnormalities occur, you can take the device and accessories to Apple’s official after-sales service.

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