DEWALT 18-Volt to 20-Volt MAX Lithium-Ion Battery Adapter Kit (2-Pack) and 20-Volt MAX Compact Lithium-Ion 4.0Ah Battery Pack DCA2203CWDCB240 - The Home Depot
DEWALT 20V MAX Battery Adapter Kit, 18V to 20V, 2 Batteries and Charger Included (DCA2203C) - Amazon.com
USB Power Source Charger Adapter, Charger Converter Adapter Fit for Dewalt DCB091 Converters Lithium-Ion Battery, Fit for Dewalt 18V 20V Max with 2 USB Port, DC Port, and Bright LED Light -
Dewalt to Ryobi battery adaptor - YouTube
Amazon.com: JJXNDO V8 Battery Adapter for Dewalt 20V Lithium Battery Converted to Replace for Dyson V8 Battery, Works with Dyson V8 Series Animal Absolute Vacuum Cleaner(DW20V8 Adapter ONLY) : Home & Kitchen
Makita Battery Adapter to DeWalt – Power Tools Adapters