After Xiaomi 10S updates MIUI12.5, charging will indeed slow down. After updating the system, the latest system limits the charging speed, so when the system overheats, the charging speed will automatically drop to the usual charging speed, the sampling speed will cancel the fast charging mode, although it shows that the fast charging protocol is still fast charging, but the charging speed at this time is more than twice slower than the fast charging speed, after becoming the normal charging speed, The battery temperature will also drop quickly, which is a choice made to protect against excessive battery temperatures in the summer.
It is recommended to use the original 33W charger and data cable for charging, using the original charger with factory configuration can ensure the charging efficiency, but also can protect the battery. In addition, it is recommended that the battery not overcharge, full can be, when the power is less than 30%, charge. In addition, the slow charging may be a problem with the phone's system. It is recommended to update to the MIUI13 system. Now I am using the Xiaomi 10S mobile phone, the system is MIUI13, and the charging time is about 55 minutes.
The upgrade will not cause the charge to slow down, you can restart the phone or re-plug the charger socket, you can solve the problem.