Generally speaking, under normal circumstances, Xiaomi 30w wireless charging 33w charging head can be used, but the maximum output power of wireless charging is less than 30 watts. Under normal circumstances, the output power of the corresponding charger is larger than the maximum output power of the wireless charge. When the 33-watt charging head supplies power to the 30 wireless charge, the charging head and the wireless charge themselves will have a certain loss, so they can be used but cannot reach the maximum power.