19.2 volt lithium ion battery - Craftsman C3 19.2 volt Lithium-Ion Battery Charger Black/red

I can answer questions about this charger, but you have not posted a question. Basically if you get a red light when plugged in, it may be functional. You won't know until you try charging a known good battery. You should be able to charge both NiCd and Lithium Ion batteries. If no red light appears when plugged in, a component has failed on the inside. These can only be repaired by a skilled technician with solid state component knowledge and soldering skills. The case is held together by four T20 anti-tamper screws under the four rubber feet. Do not apply power with the cover opened.
Common problems are shorted power rectifier diodes, shorted movistor and opened fuse. If the fuse is not blown check the filter caps by shorting across their leads with a screwdriver. If you can an arc, after the charger has been unplugged for a few minutes, it means the switching regulator has failed. Usually this is a TOP256EN. If it has burned and blew a piece off the regulator, the transformer has probably shorted. If the regulator looks OK, it may work after replacing it. There are many more possibilities, but these are some basics. BTW, this is exactly the same as a Ryobi P113 on the inside except for the battery terminals and the board layout. They have the same components.