Cutting saw with a workpiece supporting surface, a holder mounted on the carrier, a saw assembly, having a motor and saw blade, being pivotably attached to the holder above the carrier, and a dust catching device mounted on the saw assembly. The method also includes a safety termination that prohibits charge upon the expiration of a timer when the cells have stored little or no energy. By conducting communications with electrical units on identified branches, the location of an open circuit, relative to one of the electrical units can be established. A removable drive assembly having an impeller at a forward end and a power switch at the opposing end is removably inserted into the housing such that the impeller faces the rear end of the intermediate conduit.