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
DeWALT® DWDCA2203C - 20 V Li-ion 2.0 Ah Battery and Wall Battery Charger with Battery Adapter - TOOLSiD.com
Makita 18V Slider Li-ion Battery Convert to DEWALT 20V(Max) Power Tools Adapter | eBay