Happy to answer your question 66w and 80w mobile phone charging difference is a lot. Can be used, but the charging speed will be very slow, 66w mobile phone charger can be charged 80w mobile phone, 66w charger and support 80w fast charging mobile phone, they all support the fast charging protocol, even if the protocol is not the same, you can still charge, but the charging speed will not be so fast. It can be charged with the 66W charger of the Mi 11 pro connected to the 80W wireless charging base, and the maximum charging power is 50W when charging.