Huawei charging head supports qc2.0 and fcp fast charging protocol. The purple rice charging head is also compatible and can be used. The charging treasure supports 9V2A input, that is, both QC2.0 and fcp can be used for fast charging. Whether it reaches 18W depends on whether the output voltage of the charging head is stable. If the voltage is unstable at 18W, the current will drop below 18W.