........ on the age and shape of your batteries, the ambient temp, the thickness of the ice, the hardness of that ice and how warm you can keep your batterys between uses. In most cases I've heard that a "good" 18V on a 25 to 30 degree day will do about 15-20 holes thru 12-18 inches of ice. You need to be able to keep the batterys warm between uses or they loose there power quickly.