Taking a 4000mAh battery as an example, using 18W fast charge takes about 1.5 hours to be full, while 10W charge takes about 2 hours to be full, and the gap between the two is about 30 minutes.
That is, the charging current power is not the same, and the 18w fast charge is faster than the 10w fast charge.
The basic principle of charging is to power the battery, and the charging voltage should not exceed the battery operating voltage too much. It's easy to get power through charging. Either increase the voltage or increase the current.
A: 18w and 10w are the power of the charger, 18w fast charge is 8w larger than 10w ordinary charger power
18 watts fast charge, one hour can be full of mobile phones, 10 watts need two hours