Stanley Fatmax SFMCB100 V20 18V Battery Adaptor Stanley V20 Fatmax battery adapter. Lets you use V20 batteries on your old fatmax tools Ideal for converting new V20 18V STANLEY FATMAX lithium-ion technology with previous generation STANLEY FATMAX power tools using the adapter. The STANLEY FATMAX V20 18V Battery Adapter enables you to convert a 1.5Ah or 2.0Ah V20 STANLEY FATMAX battery only to be able to supply power to older generation STANLEY FATMAX powertools, enabling for greater runtime and efficiency. The V20 Lithium-ion battery pack (not included) is ready to go to work whenever you are and wherever the job takes you, with an integral battery state of charge indicator for convenient monitoring of battery charge levels. Converts 18V STANLEY FATMAX V20 1.5Ah and 2.0Ah batteries.