Product features: This is a replacement battery converter adaptor for DCA1820. For DeWalt 18 V/20 V lithium batteries to NiCad/NiMH batteries, allowing them to be used with nickel drills and chargers. Compatible with 20 V max small batteries, it is 100% compatible with DCB200, DCB201, DCB203, DCB203BT, DCB204, DCB205, and DCB206 batteries. Equipped with a 5 V 2.1 A USB port, this USB power source provides fast charging for most electronic devices, such as phones and tablets. Safe to Use: Safeguard features against incorrect voltage, battery overload, short circuits, and internal overheating.