The difference between a mobile phone charger of 10w or 18w is that the charging speed of 10w is slow, and the charging speed of 18w is fast.
18W charging power refers to the charging power of 18W by multiplying the voltage by the current, and there are mainly 9V\/2A and 12V\/1.5A two kinds.
At present, the output current of most 10W fast chargers is 2A and the voltage is 5v, so that the voltage multiplied by the current is 10w charging power.
As far as I know, the rated current voltage of the 10 watt fast charge is 5v2a, and the rated current voltage of the 18 watt fast charge is 5v3a
Answer: The difference between 10w fast charge and 18w is the speed of charging. Charging a mobile phone, if the former charge time is longer than the latter charge time.