"Junkyard Engineer" wrote in message
My old 12V Dewalt is near the end after 17 years.

Money is not my first choice parameter. Battery length, torque, guarantee,
weight are.

Although battery technology has improved over the years, I believe you'll
still find that battery life and power still come with increased weight and
size of the battery. I don't believe you're going to be able to easily
reconcile the two. Have you considered having the batteries on your 12V
Dewalt rebuilt?