Abstract: A packaged safety jumper cable comprised of two sets of cables, each set of which is comprised of a ground (negative) wire and a power (positive) wire and terminates at the outer end in clamps adapted to attach to the terminals of a battery. A container sized to hold the cables and clamps has an interior junction plate with electrical attachment points securing the inner ends of the cables. The ground wire and power wire of each set is connected such that in operation current can flow there between. A manual switch carried by the junction plate is interposed between and connects the power wires of the cables. The junction plate and switch are near the top of the container such that the switch is readily accessible. The clamps are suitably marked to indicate whether they are to be attached to the positives or negatives of the battery terminals.