The black and decker kc460ln cordless screwdriver comes with a built in li ion battery that holds its charge longer than a standard 36 volt battery this kc460ln is so compact that it allows the user to get in to the most awkward places such as under sinks kitchen cupboards or inside the car it has a long run time so theres no need for frequent charging and has a reverse function for the removal of screws at the flick of a switch specification bit holder 635mm 14in no load speed 180min max torque