The reasons for the slow charging of Huawei charger are as follows: The charger, data cable, and mobile phone charging port are not in contact during charging, or the connector and jack are dusty, which causes slow charging. You can insert and remove the charger several times, or clean the jack, and then charge again.
During the charging process, the temperature of the phone will change to a certain extent, especially when the phone is charging, some programs will make the temperature rise significantly. When the temperature of the phone is high, the charging current will be limited, and the charging speed will be slow.