Huawei mobile phone with millet charger, will not damage the battery. However, it is recommended that you first check whether the output wattage of the charger and the charging wattage of your phone match. First check whether your mobile phone supports fast charging, if you can support 60w fast charging, it is basically a face of the millet mobile phone, the charger you can use, in addition to very few reach 120w or so the charger does not see you use, the rest can be used.
Second, you can look at your charger and multiply its output current by its milliamperes to find its wattage. If the wattage of the charger is lower than the wattage of your Huawei mobile phone, it is safe to use.
This needs to compare the power of the charger, the general 5v2a is universal. However, in order to achieve fast charging, the power of the Xiaomi charger and Huawei charger are required to be used after comparison, so it is still practical to use the original charger.