How to Jump a Battery With a Portable Jumper

by Joshua Benjamin

Jumping a car is a relatively simple process. When your battery does not contain sufficient power to start your car, you use jumper cables to borrow that power from an outside source. There are two possible sources for that transference of power: another car whose alternator will provide a constant flow of power into its battery and through the jumper cables, or a portable jump pack, which is essentially a second battery designed specifically to transfer power to your car.

Ensure that your jumper pack is fully charged and that your car's ignition is turned off.

Connect the red positive (+) jumper cable to the positive (+) terminal on the car battery.

Connect the black negative (-) cable to an unpainted metal surface somewhere on the car as a ground. A non-moving piece of the engine block or the frame will work nicely.

Make sure that the jumper pack and cables are clear of any belts or fans.

Start the car. If the car does not start after a five-count, turn off the ignition and allow three minutes to pass before attempting again. This is to ensure that no damage occurs to the jumper pack or the car battery.

Start the car and, while it is running, disconnect the negative (-) cable from where you attached it to the truck and return it to the jumper pack

Disconnect the red positive (+) cable from the car battery and return it to the battery pack.


  • check Once you have jumped your car, you should immediately recharge the battery pack so as to keep it fresh and ready should it need to be used again.


  • close Be careful not to connect the wrong cable to the wrong terminal--negative to positive, etc.--or damage may occur. Do not connect the black negative (-) cable to the negative (-) terminal on the battery. Be careful not to touch the negative and positive clamps to each other, or sparking and electrical discharge will occur.

About the Author

Joshua Benjamin began as a professional freelance writer in 2009. He has successfully published numerous articles spanning a broad range of topics. Benjamin's areas of expertise include auto repair, computer hardware and software, firearms operation and maintenance, and home repair and maintenance. He is currently pursuing a Bachelor of Business Administration from California State University, Fresno.