On Sun, 25 Feb 2018 16:57:11 -0800, MOP CAP wrote:

In aprevious post I told of a person in Oshgosh WI who makes a kit for
using 20 volt Li batteries for older 18 volt NiCad tools. A bit pricey.
But probably the same as an 18 volt rebuild. Go to Craigs list Oshkosh
and search for battery adapter or such. Very happy with mine. I have no
connection to this person other than a satisfied customer.

That search doesn't find anything. Perhaps you could post a link?: