Original HP 19.5V 2.31A AC Adapter Charger 45W HP EliteBook 840 G3 G4 G5 Notebook (Not Compatible EliteBook G1 G2) HP EliteBook 850 G3 G4 G5 Notebook HP ProBook 450 430 440 446 455 470 G3 G4 G5(Not Fit Probook G1 G2) HP ProBook 640 645 650 655 G2 G3 G4