CAT 18V to DeWalt 20V Battery AdapterThe CAT 18V Caterpillar to DeWalt 20V Battery Adapter allows you to use your CAT 18V lithium batteries with compatible DeWalt 20V MAX cordless tools, giving you more flexibility from the battery platform you already own. Instead of purchasing additional DeWalt 20V MAX batteries, this adapter lets you power compatible DeWalt tools using CAT 18V batteries through a simple plug and play connection. Whether you are working on home repairs, workshop