How do you jump-start a flat battery?

Answered by CarsGuide

14 February 2019

Using a car with a sound battery connect the sound battery to the flat one using jumper cables, making sure you connect the positive to the positive, and the negative to the negative. Start the engine of the car with the sound battery before you crank the engine in the one with the flat battery. Once the engine starts disconnect the jumper cables.

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