Your car’s battery is essential for starting the engine and powering electronics. If your battery is old or struggling to hold a charge, replacing it is a straightforward process you can do yourself with just a few tools. Car batteries are usually labeled with a group size (like 24F or 35) that indicates the battery’s physical dimensions and terminal layout—make sure to get the right one for your car.
Park Safely and Turn Off the Car
Park on a flat surface, turn off the engine, and remove the keys. For extra safety, engage the parking brake and wear gloves and safety glasses.
Open the Hood and Locate the Battery
Pop the hood and find the battery—it’s usually a rectangular box with two thick cables connected to the top or side. Note the positions of the positive (+) and negative (–) terminals.
Disconnect the Negative Cable First
Using a wrench, loosen the nut on the black (negative) terminal and pull the cable off. Always disconnect the negative cable first to prevent electrical shorts.
Disconnect the Positive Cable
Next, loosen the nut on the red (positive) terminal and remove the cable. Be careful not to touch any metal tools to other parts of the car while doing this.
Remove the Old Battery
If there's a hold-down bracket or strap, remove it. Then carefully lift the battery straight up—it can be heavy, so use both hands or a battery carrying strap if available.
Clean the Battery Tray and Terminals
Use a battery cleaning brush or a mix of baking soda and water to clean any corrosion from the tray and cable connectors. Dry everything thoroughly.
Install the New Battery
Place the new battery into the tray with the terminals in the same orientation as before. Secure it with the hold-down bracket or strap.
Reconnect the Positive Cable First
Attach the red (positive) cable to the positive terminal and tighten the nut. Make sure the connection is snug but don’t over-tighten.
Reconnect the Negative Cable
Attach the black (negative) cable to the negative terminal and tighten it securely.
Test the New Battery
Start the car to make sure everything is working properly. If the engine starts smoothly and the dashboard lights are normal, you’ve done it right!
Changing your car battery yourself can save you time and money, and it’s a great way to learn more about your vehicle. Just remember to dispose of the old battery properly—most auto parts stores will recycle it for free when you buy a new one.