I don't have any cordless hammer drills, but I have 2 cordless impact 1/4" drivers. I also have a chuck that fits them, I may try that too. As I get older, weight gets to be more of an issue with each passing year. I have an 18V and a 14.4V both NiCad. I think I'll try those too. While I had several DeWalt cordless drills I started looking for lighter drills maybe 5 years ago. I tried Hitachi NiCads (model DS 18DVF3). While the were much lighter I was lucky to get 75-100 tap holes on a battery. They no longer go tapping. I suppose they make a better one but I'm not likely to try it because of the disappointment of the 2 of those I bought.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.