I have 12V cigarette lighter chargers for my Dewalt tools in 7.2, 9.6, 12, 14.4, and 18V, for NiCads, LIon, and NIMH batteries. That's all on a single charger, and they come in single port and dual port versions. And with the Dewalt 20-Vto18V adapter, I can charge my 20V batteries on the same...