This Dewalt 18V to 20V adapter is suitable for Dewalt 18V NiCad & NiMh battery tools, and 100% perfect compatible with Dewalt 20v max compact batteries DCB200 DCB206 etc. Replacement for Dewalt 18V to 20V adapter DCA1820. Convert Dewalt 20V lithium battery to Dewalt 18V NiCad / NiMH battery. The USB 5V/2.1A output port can charge compatible devices at the jobsite. Mini size and light weight will not occupy too much space, for easy to carry and store. This Dewalt 18v to 20v adapter does not work with 20V 60V flexible Volt batteries or 12V lithium batteries. Comply with FCC RoHS and CE security testing standards.