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ALERT: Communication for customers impacted by the natural disasters.

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How to Jumpstart Your Car Battery

We’ve all been there: you sit down in the car, turn the key, and the car doesn’t start. Maybe you left the lights on, a door open, you haven’t driven much lately, or maybe it’s just time for a new battery. Whatever the circumstance, a car that won’t start because of a dead car battery is an unpleasant experience. Thankfully there is a temporary solution – you can jumpstart a battery. Jumpstarting a car battery is a fairly straightforward process but can be dangerous if done improperly. With this handy guide you’ll learn how to jumpstart a dead battery in no time.

What You Will Need to Jumpstart a Battery

Before getting started you will need to acquire jumper cables and a source of power, either another vehicle or a portable jump battery (or jump box).1 If you do not have jumper cables, ask to borrow some from a neighbor or friend, and hopefully you can then use their vehicle as your power source, too. For future reference, jumper cables and portable jump batteries can be purchased online or at most auto parts stores. When purchasing jumper cables look for longer (20+ ft.) and thicker cables, as they will be more durable, since you won’t always be able to place the vehicle you are using as a power source close to yours. 2 Once you’ve obtained your jumper cables and your power source, follow these steps to get your car running again.

1. Park as Close as Possible

Unless you’re using a portable jump battery, you’re going to be using the power of another vehicle to jumpstart a battery. You will need that vehicle as close to yours as possible so that the jumper cables can reach from battery to battery. Do not get too close though, you do not want the vehicles to touch and potentially harm the paint job or dent the exterior.3

Looking to touch up your car’s paint job? Read up on the basics here.

2. Prep for the Jumpstart

Safely open the hood of each vehicle and locate the batteries. Car batteries have two large protrusions called terminals with one being positive and one negative. There's usually a plastic hood covering the battery or the battery terminals.2 You'll need to remove this hood to access the terminals.2The positive terminal will be marked with a “+” or read “POS” and will connect to the positive clip of the jumper cable, which is usually red. The negative terminal is usually marked with a “-“ or read “NEG” and will connect to the negative clip of the jumper cable, which is usually black. 1 Clean off any gunk that may be on the batteries to ensure you have a solid connection between batteries. To clean the battery, use a very small amount of water mixed with some baking soda and apply it to the debris around the terminals. Then, using a toothbrush, scrub the battery until the debris disappears. Dry off with a towel once the debris is gone. 4 Make sure to turn off both vehicles to keep from harming yourself before attaching the jumper cables.

Don’t have jumper cables or a portable jump battery? Learn more about push starting a car.

3. Attach the Jumpstart Cables

CAUTION : Once you begin the next steps, do not touch the metal portion of the jumper cable clamps to each other. If the clamps do touch when they're hot, you could cause a short in either vehicle and create some dangerous sparks.2

When you jumpstart a car, you are creating a circuit that carries the current from the live battery over to the dead one to provide enough charge in the dead battery to restart the car.8 In order to do this successfully the cables should be connected in this exact order.

  1. Take the red (positive, +) clamp of your jumper cables and attach it to the positive terminal of the dead battery.

  2. Hook the red clamp of the jumper cables to the positive terminal of the working battery.

  3. Attach the black (NEG, -) clamp to the negative terminal of the working battery. Your jumper cables are now hot!

  4. Take the remaining black clamp and attach it to any unpainted and clean metal surface under the car’s hood with the dead battery to ground the connection. Make sure not to touch the two ends of the cables together while doing this.5

4. Start Your Engines

Once you have the jumper cables properly attached, start the engine of the working car. Allow it to run for about 1-2 minutes. Rev the engine slightly by pressing on the gas pedal lightly. Next, start the engine of the car with the dead battery. If the car still isn’t starting, check the connection of the jumper cables to the batteries and make sure there isn’t any gunk interrupting the connection between cable and battery. If connections are secure, you may just need to let the good car run for 5-10 minutes while hooked up to the dead car to help build a charge in the dead battery to allow you to restart it. When the car with the dead battery has started, let it run for around 20 minutes to allow the battery to recharge before turning the cars off again.3 Once you’ve let the battery recharge you can remove the jumpstart cables in the reverse order that you put them on the terminals.6

Do not try to restart the car with the dead battery more than three to four times or you may cause serious electrical damage to the car. If your car still won’t start, you’ll need to contact a service station. Use our locator to find Auto Parts and Services Locations.

A good rule of thumb is to test your battery each time you have your oil changed to help avoid jumpstarting a car battery. Also, if you have a second car that you don’t drive very often, it’s still best to give it a drive at least once a month to keep the battery charged.7 Even between oil changes, you can request a free battery test at many automotive parts stores. And when it’s time to replace your battery, use the Synchrony Car CareTM locator to find a shop near you that accepts the Synchrony Car CareTM credit card.*

Apply now for the Synchrony Car CareTM credit card.

*Subject to credit approval. Minimum monthly payment required. Valid everywhere Synchrony Car CareTM is accepted in the U.S., including Puerto Rico. See store for details.


1. How to Jump a Car: Simple Steps to Bring Your Car Battery Back to Life Drive Safely

2. How to Jumpstart a Car Popular Mechanics

3. How to Jump-Start a Car with a Dead Battery Consumer Reports

4. The Quick and Easy Way to Clean Car Battery Corosion Powertron

5. How to Effectively Jump Start a Car Car Bibles

6. How to Jump a Car: Simple Steps to Bring Your Car Battery Back to Life IDriveSafely

7. How Often Do I Need to Use My Car to Prevent Battery Death? The Globe and Mail

8. The Do’s and Don’ts of Jumpstarting a Car Your Mechanic

Learn More

1. How to Jumpstart a Car Without Another Car? With 2 Popular Methods! Car Colonel

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