HP Notebook 19.5v 2.31a 45w 4.53.0mm)

HP Notebook Charger you described (19.5v 2.31a 45w 4.53.0mm) is a common charger for many HP laptops. It provides 45 watts of power at 19.5 volts and 2.31 amps. The 4.5 * 3.0mm refers to the size of the DC connector on the tip of the charger.