I have a buddy with 6 inch kdrill and a milwauke 18 and clam drill plate. He changed batteries after about 6 holes in 28 inches of ice. I drilled 6 holes with my dewalt and 6 inch nils. MY battery was over 50 percent. The nils uses less battery and is faster. The k drill can drill open old holes. My nils is for fresh holes only. They both are good units it just depends if you need ability to open old holes like in a fish house. In 20 inches of ice I have drilled 20 holes and still at 50 % or Above on battery.
Mwal