As some of know I recently came into possession of a set of Craftsman 19.2 volt tools. I was looking at the charger (CH2030) and noticed that it has 12 volt . 19.2 volt in the upper left corner. Does this indicate that I can recharge batteries from 12 volt to 19.2 volt? Say, for example someone has a Craftsman tool that uses 15 volt batteries, however they neglected to bring their charger, would that person be able to use my charger?

Here you go.

Charger manual