Went sailing a couple of weeks ago with a friend who owns a Catalina 350 with a conventional main. He uses a Milwaukee 1/2" variable speed right angle drill with an adaptor to fit the winch. I was really impressed with the set up; very fast & easy to hoist the main. He uses it because he has a shoulder problem. He told me that the lithium ion battery stays charged for 2 to 3 months. Note that this is a heavy duty drill with a lot of torque.