Black and Decker FSMVC Firestorm 9.6V -18V, Fast Slide Battery Charger features: Computerized charging optimizes charging of battery cells. Has an indicator light that indicates "charged", "charging" or "defective pack". Fast charging enables the user to recharge batteries quickly to continue their project. Charges all Firestorm¿ and Black and Decker Spring-loaded style batteries 9.6V through 18V. FSMVC Multi-voltage charger. Use with "slide" Firestorm batteries 9.6V-18V spring-loaded style batteries. Not for use with the batteries that have a "stem" that goes up into the tool. Model for the charger for the PS series stem type batteries is model PS1MVC