Charging speed mainly depends on the parameters of the charger, the higher the wattage, the faster the charging speed, 18w flash charge and 18w fast charge is actually the same parameter, but the name on a called flash charge a called fast charge, theoretically speaking, the charging speed is actually the same, normally speaking, the current can be called flash charge basically above 67w to 80w or even 120w, The highest is 160w