How big is the screw on the battery cover of Nanwei electric drill?

Five millimeters. Screws are generally made of copper or iron plated with white copper. When discharging, the positive and negative electrodes react with sulfuric acid to generate lead sulfate, which is not easy to corrode. 5 mm screws are used. Electric drill is a kind of drilling machine powered by electricity. It is a conventional product of power tools and the product with the greatest demand for power tools.