Why doesn’t my WRX STI battery stay charged?

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 a habit of leaving your car doors open and the lights on overnight. Stop by for a complimentary battery check at your favorite Firestone Complete Auto Care and learn more about your battery's charge.

What do you do with my dead WRX STI battery?

We’ll recycle your car battery for you!

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.

What is the average lifespan of a car battery?

You can usually get three to five years out of your car battery. However, battery type, how well you maintain your battery, and your driving habits can all affect your battery’s lifespan.

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

The white, flaky stuff that can build up around your WRX STI’s battery terminals is known as corrosion. Acid leaking from your vehicle’s battery post can have a chemical reaction with the air, leading to an accumulation of the white, powdery substance over time. Corrosion can affect the flow of electricity between your battery and the electrical system in your WRX STI, possibly causing issues with electrical performance and starting. If left unaddressed for long enough, it may even cause your battery to prematurely fail.

How do I remove corrosion from my WRX STI car battery?

Regularly inspecting and cleaning your battery terminals will help keep your WRX STI’s electrical system running smoothly. Before cleaning, reference your owner’s manual for instructions on how to disconnect the battery cables. Once the cables have been disconnected, gently clean the terminals with a mixture of water and baking soda, a wire brush, and a rag.

Where can I purchase WRX STI batteries near me?

When you need a new battery for your vehicle, Firestone Complete Auto Care is here to help. We sell and install WRX STI batteries at our stores nationwide — and our Firestone Direct mobile vans can provide convenient on-site battery services. Learn more about our mobile battery services and book an appointment.

2021 Subaru WRX STI Batteries

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Get a Battery for Your Subaru WRX STI

The middle of nowhere is the wrong place to have a weak battery. Shop replacement batteries for 2021 Subaru WRX STI today and schedule a quick installation at Firestone Complete Auto Care.

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2021 Subaru WRX STI Battery Replacement & Size

Researching battery replacements 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
26R-3	H4/2.5L	Replacement 24 months	Performance months	575
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: 26R-3 - Warranty: Replacement 24 months, Performance months - Cold Cranking Amps: 575
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. The average car battery lasts three to five years. Check your battery regularly and replace it as needed so it doesn’t leave you and your Subaru WRX STI stranded. Look out for symptoms of a faulty car battery. A sluggish engine start, an illuminated check engine light or battery signal, bloated battery case, corroded battery terminals, or faded headlights may all indicate that your battery is on its last leg.

You can also get a Free Battery Test at your local Firestone Complete Auto Care. With best-in-class tools we can tell you how much "life" is left in your battery. Stop by for a free battery test and, if needed, a replacement battery for your 2021 Subaru WRX STI. Car batteries are only one of our many strong suits. Our expert technicians understand Subaru service recommendations for WRX STI car batteries’ reserve capacities and cold cranking amps. Get help choosing the battery size that's best for your WRX STI, and schedule a fast car battery replacement at your earliest convenience.

Find the Right DieHard Battery for Your WRX STI

We know what’s best for your Subaru WRX STI, which is why we carry just that. You need a reliable, durable and powerful battery that can handle most extreme environments and weather conditions. DieHard batteries shatter expectations and house the latest technology to meet the growing power needs of modern vehicles They're no ordinary battery, they're extraordinary. Choose a DieHard battery for your Subaru WRX STI and drive with confidence knowing that performance will be there when you need it most. That's the kind of battery we deliver.

Caring for a New Subaru WRX STI Battery

Got a new car battery installed in your 2021 Subaru WRX STI? Good thinking! Give your new car battery the best start with proper care. Give your new battery a hand by decreasing the number of short trips you take, 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

Turn to Firestone Complete Auto Care for answers to all your car battery questions. If you have battery questions that are Subaru WRX STI-specific, pay us a visit. Our technicians are happy to help.

Why doesn’t my WRX STI battery stay charged? 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 a habit of leaving your car doors open and the lights on overnight. Stop by for a complimentary battery check at your favorite Firestone Complete Auto Care and learn more about your battery's charge.
What do you do with my dead WRX STI battery? We’ll recycle your car battery for you!
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.
What is the average lifespan of a car battery? You can usually get three to five years out of your car battery. However, battery type, how well you maintain your battery, and your driving habits can all affect your battery’s lifespan.
What is the white, crusty substance accumulating on my WRX STI’s battery post? The white, flaky stuff that can build up around your WRX STI’s battery terminals is known as corrosion. Acid leaking from your vehicle’s battery post can have a chemical reaction with the air, leading to an accumulation of the white, powdery substance over time. Corrosion can affect the flow of electricity between your battery and the electrical system in your WRX STI, possibly causing issues with electrical performance and starting. If left unaddressed for long enough, it may even cause your battery to prematurely fail.
How do I remove corrosion from my WRX STI car battery? Regularly inspecting and cleaning your battery terminals will help keep your WRX STI’s electrical system running smoothly. Before cleaning, reference your owner’s manual for instructions on how to disconnect the battery cables. Once the cables have been disconnected, gently clean the terminals with a mixture of water and baking soda, a wire brush, and a rag.
Where can I purchase WRX STI batteries near me? When you need a new battery for your vehicle, Firestone Complete Auto Care is here to help. We sell and install WRX STI batteries at our stores nationwide — and our Firestone Direct mobile vans can provide convenient on-site battery services. Learn more about our mobile battery services and book an appointment.