18w fast charging bank can use 20w charging cable.
The 18 watt Fast charge protocol power bank supports a maximum of 18 watts of power output. If the charging cable is smaller than 18 watts, the actual maximum power output is the same as that of the charging cable. When using more than 18 watts of data cable charging, 18 watts of charging treasure can be up to 18 watts of full power output. Therefore, in order to exert the maximum output power of the charging treasure, it is necessary to use a data cable that is greater than or equal to 18 watts.
A 20w line can be used. Charging cable 20w means that this charging cable can withstand up to 20w fast charging head, fast charging mode, less than 20w chargers can also use this charging cable, will not cause any harm. For the charging bank, the use of this charging cable can be quickly charged, and it will not have any harm to the phone, so of course it can be used.
18w fast charger can not use 20w cable. Because the charging Settings do not match, it will hurt the charging treasure