Why won’t my WRX STI battery hold a charge?

A battery is in its final hour when it will no longer hold a charge. The battery may be too old. Or, you may have been leaving your car doors ajar and the cabin light at night. Stop by for a free battery test at your favorite Firestone Complete Auto Care to learn more about the state of your battery.

What happens to my old WRX STI battery?

We recycle it, taking care of both your car and the Earth.

What’s the cost of DieHard batteries for Subaru WRX STIs?

Get affordable prices on Subaru WRX STI batteries by using one of our limited-time battery deals. Plus, all DieHard car batteries come with a free replacement warranty and extra coverage with DieHard Assurance.

How long is a car battery good for?

Car battery lifespan varies depending on a few factors, including driving conditions, accessories, how well it’s maintained, and the type of battery. On average, a car battery lasts about three to five years.

What is the white, crusty substance accumulating on my WRX STI’s battery post?

If you notice white, crusty stuff around the battery terminals of your WRX STI, it's likely corrosion. A chemical reaction between battery acid and the air can create a white, powdery substance that builds up over time on the terminals. This buildup can interfere with the electrical connection between the battery and your WRX STI’s electrical system, potentially leading to poor performance, difficulty starting, and other issues.

How do I clean a corroded WRX STI battery terminal?

You can help prevent or get rid of corrosion by regularly inspecting and cleaning your battery terminals. Before cleaning your battery, see your WRX STI owner's manual to learn how to disconnect the battery cables. After disconnecting the cables, use a mixture of water and baking soda, a wire brush, and a rag to carefully clean the terminals.

Who sells WRX STI batteries near me?

Your local Firestone Complete Auto Care sells and installs WRX STI batteries in your neighborhood. Our Firestone Direct mobile vans can even come to you and do it! Learn more about mobile battery services.

2018 Subaru WRX STI Car Batteries

Get a New Subaru Battery

Get a Battery for Your Subaru WRX STI

Don't let a failing battery slow you down. Shop replacement batteries for 2018 Subaru WRX STIs today and schedule a quick installation at Firestone Complete Auto Care.

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The Right Battery Size for a 2018 Subaru WRX STI

Not sure what battery to get for your Subaru WRX STI? Use the following chart to find information on Subaru WRX STI battery size and cold cranking amps.

Battery	Engine	Warranty		Cold Cranking Amps
35-1	H4/2.5L	Replacement 24 months	Performance months	500
35-2	H4/2.5L	Replacement 36 months	Performance months	640
35-AGM	H4/2.5L	Replacement 36 months	Performance months	650

BATTERIES
H4/2.5L - Battery: 35-1 - Warranty: Replacement 24 months, Performance months - Cold Cranking Amps: 500
H4/2.5L - Battery: 35-2 - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 640
H4/2.5L - Battery: 35-AGM - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 650

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Buying a Replacement Battery for Subaru WRX STI

Your WRX STI doesn't have an expiration date, but its battery does. On average, auto batteries last anywhere from three to five years. Don’t get stranded by your WRX STI’s car battery. Replace it regularly instead! Watch for signs that your current battery is getting too old or too weak. A slow engine crank, a blinking battery or check engine light, bloated battery case, corroded battery terminals, or dim headlights can all be signs that your battery is on its last leg.

Plus, at Firestone Complete Auto Care, we’ll test your battery for free. With best-in-class tools we can tell you how much "life" is left in your battery. Drop in for a free battery check and, if necessary, a battery replacement to help keep your 2018 Subaru WRX STI running! Car batteries are one of our many specialties! Our technicians are well-acquainted with Subaru’s service specs for WRX STI battery CCAs and reserve capacity. Get help choosing the battery size that matches your vehicle, and schedule a fast car battery replacement at your earliest convenience.

Firestone Has DieHard Batteries for WRX STIs

We only want what’s best for your Subaru WRX STI, which is why we exclusively carry the best. Your WRX STI needs a reliable, durable and powerful battery in extremely hot and cold environments. DieHard batteries go above and beyond and house the latest technology to satisfy the expanding power demands of modern vehicles Don't call a DieHard battery ordinary. It's an extraordinary battery. Buy a DieHard battery for your Subaru WRX STI and have the peace of mind that performance will be there when you need it most. That’s why you should choose batteries from Firestone Complete Auto Care.

Caring for a New Subaru WRX STI Battery

Have you recently had a fresh battery installed in your Subaru WRX STI? Congrats! Now, help it last longer and stay charged by caring for it from the get-go. You can take care of your battery by limiting short trips, keeping your battery posts clean, and not playing the radio or using other electronics when the engine is turned off.

Answers to Your WRX STI Car Battery Questions

Firestone Complete Auto Care has answers to your top car battery questions. If you have a WRX STI-specific battery question, visit your nearest store. Our expert techs have the answers you need.

Why won’t my WRX STI battery hold a charge? A battery is in its final hour when it will no longer hold a charge. The battery may be too old. Or, you may have been leaving your car doors ajar and the cabin light at night. Stop by for a free battery test at your favorite Firestone Complete Auto Care to learn more about the state of your battery.
What happens to my old WRX STI battery? We recycle it, taking care of both your car and the Earth.
What’s the cost of DieHard batteries for Subaru WRX STIs? Get affordable prices on Subaru WRX STI batteries by using one of our limited-time battery deals. Plus, all DieHard car batteries come with a free replacement warranty and extra coverage with DieHard Assurance.
How long is a car battery good for? Car battery lifespan varies depending on a few factors, including driving conditions, accessories, how well it’s maintained, and the type of battery. On average, a car battery lasts about three to five years.
What is the white, crusty substance accumulating on my WRX STI’s battery post? If you notice white, crusty stuff around the battery terminals of your WRX STI, it's likely corrosion. A chemical reaction between battery acid and the air can create a white, powdery substance that builds up over time on the terminals. This buildup can interfere with the electrical connection between the battery and your WRX STI’s electrical system, potentially leading to poor performance, difficulty starting, and other issues.
How do I clean a corroded WRX STI battery terminal? You can help prevent or get rid of corrosion by regularly inspecting and cleaning your battery terminals. Before cleaning your battery, see your WRX STI owner's manual to learn how to disconnect the battery cables. After disconnecting the cables, use a mixture of water and baking soda, a wire brush, and a rag to carefully clean the terminals.
Who sells WRX STI batteries near me? Your local Firestone Complete Auto Care sells and installs WRX STI batteries in your neighborhood. Our Firestone Direct mobile vans can even come to you and do it! Learn more about mobile battery services.