Convert your Dewalt 20V lithium battery into an 18V powerhouse with the DCA1820 Battery Adapter. This innovative converter allows seamless compatibility with most DEWALT 18V tools, paving the way for the utilization of 20V MAX compact batteries. Crafted using advanced spot welding technology, this adapter ensures automatic battery sorting and internal resistance measurement. Please note that the DCA1820 adapter is not compatible with Dewalt 12V and 20V/60V FLEXVOLT Batteries. Simply remove the adapter before charging your battery to enjoy its benefits hassle-free. Compatible with a range of Dewalt 18V/20V lithium batteries, this converter boasts a USB interface output of DC 5V/2.1A. Experience versatility and convenience with this must-have accessory for your power tools. Package includes: 1 * Battery Adapter.