Can this adapter be used to charge also? Have the older radio

Sorry for the delay responded. I wanted to confirm with DeWALT. The adapter cannot be used in tandom with a charger. You would need the 20V MAX batter(ies) and charger. The adapter is available as a kit with the charger and one or two batteries as well. Use this link to see the various options: http://www.toolnut.com/SearchResults.asp?Search=dewalt+battery+adapter