Here’s how to use a jump box or jumper pack, first turn off all lights and electrical accessories in the dead vehicle. Next, connect the cables the same as you would ordinary jumper cables—positive clamp to the positive battery post and negative clamp to a metallic engine component or chassis grounding point. Then try starting the vehicle.

Steps to jump start a car battery: Pull the booster vehicle so it’s close to car with the dead battery. You want them close enough so that the jumper cables will reach, but not so close that they touch. Turn off the ignition of both cars.