The charger power is 22.5w. Because the nominal parameter is 10v 2.25A charger, it means that its rated output voltage is 10v, and the maximum output current is 2.25A, so its power w=u*i=10*2.25=22.5w. In actual use, the entire charging process of the charger does not maintain the entire output power at 22.5w, such as in the late constant voltage micro-current charging, the charger output power is much lower than 22.5w.
Power = voltage x current
Power =10x2.25=22.5w