Amazon.com: Fancy Buying Replacement Battery Adapter DCA1820 for Dewalt 18V Tools, Convert 18V / 20V Lithium Battery to NiCad/NiMH Battery, Makes The Battery can be Used for Nickel Drill and Charger :
DEWALT 18-Volt 2-Pack 2.4 Amp-Hour; 2.4 Amp-Hour Nickel Cadmium (Nicd) Power Tool Battery Kit in the Power Tool Batteries & Chargers department at Lowes.com