Robert K Smith

I just got an old Ryobi 12v drill at a garage sale. I was told I would need a new charger. Problem is the identifying label on the right side of the drill has been scraped off. On the other side I can see what was probably RYOBI with a 12.o v under it. The drill is a bluish green and has two vent slots on each side. The battery says it is a 1400652. What kind of charge to I need to get for this thing? What other - newer - batteries are compatible and what chargers would they require? Thanks