How to Change a Car Battery

Install a car battery in your vehicle to save time and money while restoring optimal performance to your car, truck, or SUV. Replacing car batteries is an easy form of maintenance that will only take a few minutes of your time and a few tools.




Tools & Materials

How to Change a Car Battery Instructions

These days, you could find your battery in the trunk or even behind a wheel well so, as usual, we recommend you consult your service manual before you get into this. A top post battery was used in this job. If your vehicle has a side terminal battery, the steps will be much the same. Side terminal batteries do not have top posts. The terminals are molded into the side wall of the battery and they use a different style of battery cable end. And if you find installing a new battery is going to be more complicated than you thought, we’d be happy to recommend a professional technician in your area.

Remove the Old Battery

mechanic loosening battery hold-down

Step 1: Loosen Battery Hold Down

Open the hood. Loosen the hold-down, and slip out the curved end. That will then just swing out of the way.


Do It Right: It’s good to have a socket set so that you can find the right size for your hold-down.

When you install a new battery, your radio presets and other operator preferences will be cleared out. In some vehicles, you may have to re-enter a security code to get the stereo working again. Check your service manual to see if your vehicle requires a memory saver.

disconnecting the negative cable

Step 2: Disconnect Negative Cable

Disconnect the negative battery cable end from the negative battery terminal post. The battery will be marked with a (-) minus sign near that post. Loosen the battery cable end just enough to slip it off and move it to the side, out of your way. Make sure it is not resting on bare metal.
Man removing the positive battery cable from the terminal post

Step 3: Disconnect Positive Cable

Disconnect the positive battery cable end from the positive battery terminal post. The battery will be marked with a (+) plus sign near that post. Loosen the connector enough that you can slip it off, and move it to the side.
Mechanic lifting out the old battery from the vehicle

Step 4: Lift Battery Out

At this point, you should be ready to lift the battery out. Make sure you keep it upright as you carefully lift it out.

Install the New Battery

Mechanic placing a new Super Start battery into the vehicle

Step 5: Put New Battery In

Once you have your new battery, ease it back into the tray.
Mechanic placing existing terminal washers onto the new Super Start battery

Step 6: Put Terminal Washers On

To prevent corrosion, it's a good idea to use terminal washers and/or terminal protective spray. If using spray, don't put it on until Step 9.


Do It Right: It's not necessary to use both terminal washers and terminal protective spray, but there isn't a drawback to using both.

Mechanic reconnecting the positive cable to the new Super Start battery

Step 7: Connect Positive Cable

Connect the positive battery cable end to the positive battery terminal post. Be sure to push it as far down on the post as possible before you tighten it.
Mechanic reconnecting the negative cable to the new Super Start battery

Step 8: Connect Negative Cable

Next, connect the negative battery cable end to the negative battery terminal post. Again, be sure to push the end as far down on the post as possible before you tighten it.
Mechanic spraying terminal protective spray on the terminals

Step 9: Spray Terminal Protective Spray

To prevent corrosion, it's a good idea to use terminal protective spray and/or terminal washers. Terminal protective spray will be used after you reattach the battery cables.
Mechanic repositioning battery hold down and tightening it with a wrench

Step 10: Tighten Battery Hold-Down

Reposition the hold-down, slip the curved end into the hole and tighten it down.
Man sitting in the driver’s seat of the car

Step 11: Start the Vehicle

Make sure your engine will start before you close the hood.

Additional Resources

Batteries

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Need a battery replacement? O’Reilly Auto Parts has batteries for cars, trucks, SUVs, marine applications and more! Whether you need a car battery installation, or help finding the right battery for your vehicle, our parts professionals are here to assist with all of your battery needs. Visit us at your local O’Reilly Auto Parts store, where we offer our signature O’Reilly battery installation and battery testing services, or shop online. Check out our wide selection of batteries, jumper cables, car battery chargers, battery terminal cleaners, battery cables, and battery terminal protectors to help keep your vehicle powered and on the road.

The automotive repair work depicted in this series is performed under the direction of the manufacturer of the product featured. Prior to undertaking any of the demonstrated repairs on your vehicle, we suggest you consult with a certified mechanic or another professional who can adequately advise you of the proper repair or remedy required. O’Reilly Automotive Stores, Inc. and its affiliates (“O’Reilly”) disclaims any responsibility for injury or damage resulting from a viewer’s attempt to recreate the repairs shown in this series.