I have 18V and 14V Milwaukee hammer drills. I have had them for over 3 years and only had one battery take a dump and Milwaukee replaced it free of charge. I have had DeWalt and Porter Cable as well but have been happiest with the Milwaukee. I only use a cordless hammer drill for setting TapCons and other small anchors up to 5/16" dia. Anything bigger(up to 3") gets the corded Bosch SDS. 4"-6" gets the Dewalt spline drive and if its bigger than that I call the core drilling crew.