I love my Craftsman Drill that came with two battery packs. It's 7
years old so I had to upgrade the battery packs as it wouldn't hold a
charge for a day.
I replaced the 1300 mah cells with 3600 mah cells. Soldered them in
myself. I tested it after a 2 hour charge and I now believe it is
the most powerful drill in the world. In fact I think the world quit
turning for a second when I tried to force it to stop.