1. Optimize battery charging: When the "Optimize battery charging" function option is turned on in battery health, slow charging will be started after charging to 80%, which will delay charging, and this function can slow down battery aging.
2.80% upper limit: iphone 15 series introduced the battery upper limit function. After the iPhone is turned on, it will automatically stop charging when there is only about 80% power. The old system has not yet provided an 80% upper limit charging switch.
3. The temperature of the device is too high: If high-load work programs such as large-scale games are run during the charging process of the mobile phone, the temperature of the iPhone may be too high, and the protection mechanism will be started. At this time, charging the mobile phone may slow down or even stop charging.