CONVERTING A 14.4 CORDLESS PORTER CABLE DRILL TO CORDED

I am dumb today, Im also busy. best power supply for converting a cordless drill to corded would be the battery charger? or not? 6.5 amp 14.4 volt porter cable drill - model 877 charger reads 12v/14.4v 1.8 amp charger My math and logic tells me I am going to need roughyl 3 times the amperage to power this focker to full go, and that I should locate another higher amperage dealy, like a car batter charger or something....