I bought an adapter for my 18v DeWalt tools so it could use the new, 20v LI batteries. Unhappily, it is nearly impossible to remove the adapter from the tool, and the LI battery is barely able to hold a charge. So I've purchased new 18v batteries and will use them until they die and I'm forced to go 20v. I hope DeWalt will fix the adapter so it is more easily removed from the tool, I don't really want to buy adapters for all six of the tools. Ask me why I'm not a DeWalt fan.
The more I do, the less I accomplish.