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DEWALT 20V MAX Battery Adapter Kit, 18V to 20V, 2 Batteries and Charger Included (DCA2203C) - Amazon.com
MAK1820 Battery Adapter For Makita 18V Li-Ion Battery BL1830 BL1860 Convert to for Dewalt DC9096 Ni-Cd Ni-Mh Batteries Tools
Nickel cadmium (NiCd) Battery Power Tool Accessories at Lowes.com
DEWALT DC411B 4-1/2-Inch 18-Volt Cordless Cut-Off Tool (Tool Only) - Power Metal Cutting Saws - Amazon.com
Farm Update and: Upgrade old 18v Dewalt cordless tool: 20v lithium ion adapter kit review - YouTube
DEWALT FLEXVOLT 20V/60V MAX Lithium-Ion 9.0Ah Battery DCB609 - The Home Depot