1. There is no big difference between 22.5w and 18w fast charging, that is, the charging current power is not the same, and the 22.5w fast charging is faster than the 18w fast charging.
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2. Fast charge refers to a charging method that can make the battery reach or approach the state of full charge within 1 ~ 5h. It is often used for charging traction batteries when they need to be restored to a fully charged state in a relatively short time.
18w flash charge and 22.5w fast charge, 22.5w fast charge is better, charging is faster than 18w flash charge.
Because we can know that there is a difference of 4.5W after calculation, but this 4.5W is equivalent to one-fifth of 22.5, so 22.5W is one-fifth larger than 18W, and the phone needs to be charged for 4 hours at the speed of 22.5W, and 18.5W needs to be charged for 5 hours.