Abstract: A DC voltage source is housed in a reusable casing having bottom and side walls. A pair of coplanar terminal plates are slidably attached in a track along the bottom wall of the casing as to be horizontally movable to adjust the distance between the plates to correlate to the spacing between the terminal posts on the top surface of a conventional automotive battery. In use the auxiliary power source is self-contained, portable, and placed on top of a dead vehicle battery such that the charged terminal plates on the casing are in contact with the corresponding terminal posts of the dead battery and the vehicle is started.