The slow charging of millet mobile phones may be caused by the incompatibility of charging devices. Xiaomi mobile phones support fast charging technology, if the charger used is insufficient or non-genuine charger, it will lead to slow charging speed.
In order to avoid this situation, it is recommended to use an original charger or an officially certified charger, and to ensure that the power of the charger can meet the requirements of the phone.
In addition, you can also check whether the charging port has impurities or damage, and whether the back of the phone is overheating.
If the above situation does not exist, it may be the hardware problem of the phone itself, and it needs to be repaired by a professional after-sales maintenance organization.