jump leads

/JH AH1 M P L IY0 D Z/
noun
  1. 1

    (often pluralized) A pair of insulated electrical wires with alligator clips at each end used to jump-start a car with a dead (flat) battery.

    He kept a jumper cable in an emergency box in the car, as he had once been caught with a dead battery.

Source: https://en.wiktionary.org/wiki/jump%20lead, https://en.wiktionary.org/wiki/jump%20leads, https://en.wiktionary.org/wiki/jumper%20cable