Dell has different XPS models. Mostly it depends on the display size because of the wattage. In principle, this also works if your notebook only requires 45 watts, the power supply unit integrated in the notebook regulates the power supply.

On the manufacturer's website, it only says that the charging power is 65 W. This then depends on the power of the volts. But in fact, we should not have noted the 13000 mAh. So it is minimum 13000 mAh and maximum 3250 mAh.

No, unfortunately the Latitude 7480 is not listed in the compatibility list.