I think I bought that drill right around 1976. It was just after it came out.
I lived in a little mountain cabin without electricity at the time, and could use the lighter plug in my pickup to recharge it.
The batteries which were built in, lasted fairly well but of course died totally eventually.
So I cut them out and wired in a cord.
Then I could reach anywhere,
within 12' of my truck..... heeheh
yours Scott