XS supports up to 18w fast charge, but the original is still a 5w charger. The XS supports 18w fast charge, so even if it uses 30w fast charge, its maximum power is about 18w. And because of the protection mechanism of the battery, even if you use 18w fast charge, it does not always maintain 18w power. When the temperature is too high, it automatically reduces the power and protects the safety of the battery.