Why won’t my SL550 battery hold a charge?

A battery that won't hold a charge is almost as good as dead. The battery may be too old. Or, you may have been leaving your car doors ajar and the cabin light at night. Stop in for a free battery check at your favorite Firestone Complete Auto Care and get a handle on your car battery’s health.

What do you do with my old SL550 battery?

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

How much do DieHard batteries cost for your Mercedes-Benz SL550?

Mercedes-Benz SL550 batteries can be affordable, especially when there's an available battery coupon. The best part is every DieHard battery comes with a free replacement warranty and extra coverage with DieHard Assurance.

What is the average lifespan of a car battery?

The typical 12-volt car battery may last three to five years, depending on the type of battery, the driving conditions, and how well the battery is maintained.

Why is there white, crusty buildup on my SL550’s battery post?

The white, flaky stuff that can build up around your SL550’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 SL550, possibly causing issues with electrical performance and starting. If left unaddressed for long enough, it may even cause your battery to prematurely fail.

What do I do about corrosion on my SL550 car battery?

Regularly inspect the terminals and clean them with a mixture of baking soda and water, a wire brush, and a rag. Disconnect the battery cables before cleaning to help avoid the risk of electrical shock. Always reference and follow the instructions in your vehicle owner’s manual prior to disconnecting the battery cables.

Where can I find a battery for my SL550?

When you need a new battery for your vehicle, Firestone Complete Auto Care is here to help. We sell and install SL550 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.

2009 Mercedes-Benz SL550 Batteries

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Mercedes-Benz SL550 Batteries Near You

The middle of nowhere is the wrong place to have a weak battery. Shop replacement batteries for 2009 Mercedes-Benz SL550 today and schedule a quick installation at Firestone Complete Auto Care.

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Battery Size & Replacement for 2009 Mercedes-Benz SL550

Not sure what battery to get for your Mercedes-Benz SL550? Use the following chart to find information on Mercedes-Benz SL550 battery size and cold cranking amps.

Battery	Engine	Warranty		Cold Cranking Amps
V4	V8/5.5L	Replacement 36 months	Performance months	520
H6-AGM	V8/5.5L	Replacement 36 months	Performance months	760

BATTERIES
V8/5.5L - Battery: V4 - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 520
V8/5.5L - Battery: H6-AGM - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 760

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Buying a Replacement Battery for Mercedes-Benz SL550

Sadly, your Mercedes-Benz SL550 won't last forever. Neither will its battery. 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 Mercedes-Benz SL550 stranded. Pay attention to clues that your battery is on its way out. A slow engine crank, an illuminated battery or check engine light, bloated battery case, corrosion-covered posts, or dim headlights can all be signs that your battery needs attention.

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. Drop in for a free battery check and, if needed, get your Mercedes-Benz SL550 a replacement battery. Automotive batteries are just one of our many areas of expertise. Our expert technicians understand Mercedes-Benz service recommendations for SL550 car batteries’ reserve capacities and cold cranking amps. Get help identifying the type and size of battery that fits your car perfectly, and schedule a weekday or weekend battery replacement service for your car.

Find the Right DieHard Battery for Your SL550

Your Mercedes-Benz SL550 deserves the best, which is why we carry just that. Your SL550 needs a reliable, durable and powerful battery in even some of the toughest conditions. DieHard batteries go above and beyond using state-of-the-art advancements to satisfy the growing power requirements of new vehicles. Don't call a DieHard battery ordinary. It's an extraordinary battery. Choose a DieHard battery for your Mercedes-Benz SL550 and have the peace of mind that performance will be there when you're counting on it. That's the kind of battery we deliver.

Making Your SL550’s New Battery Last

Got a new car battery installed in your 2009 Mercedes-Benz SL550? Good thinking! You can give your new battery a head start with proper care and attention. flipping the dome lights and headlights off when exiting the car, decreasing the number of short trips you take, keeping the battery posts corrosion-free, and not playing the radio or using other electronics when the engine is turned off.

Commonly Asked SL550 Battery Questions

Firestone Complete Auto Care has answers to your top car battery questions. If you have a battery question that's unique to your Mercedes-Benz SL550 battery, stop by your nearest store. Our technicians are happy to help.

Why won’t my SL550 battery hold a charge? A battery that won't hold a charge is almost as good as dead. The battery may be too old. Or, you may have been leaving your car doors ajar and the cabin light at night. Stop in for a free battery check at your favorite Firestone Complete Auto Care and get a handle on your car battery’s health.
What do you do with my old SL550 battery? We recycle it, taking care of both your car and the Earth.
How much do DieHard batteries cost for your Mercedes-Benz SL550? Mercedes-Benz SL550 batteries can be affordable, especially when there's an available battery coupon. The best part is every DieHard battery comes with a free replacement warranty and extra coverage with DieHard Assurance.
What is the average lifespan of a car battery? The typical 12-volt car battery may last three to five years, depending on the type of battery, the driving conditions, and how well the battery is maintained.
Why is there white, crusty buildup on my SL550’s battery post? The white, flaky stuff that can build up around your SL550’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 SL550, possibly causing issues with electrical performance and starting. If left unaddressed for long enough, it may even cause your battery to prematurely fail.
What do I do about corrosion on my SL550 car battery? Regularly inspect the terminals and clean them with a mixture of baking soda and water, a wire brush, and a rag. Disconnect the battery cables before cleaning to help avoid the risk of electrical shock. Always reference and follow the instructions in your vehicle owner’s manual prior to disconnecting the battery cables.
Where can I find a battery for my SL550? When you need a new battery for your vehicle, Firestone Complete Auto Care is here to help. We sell and install SL550 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.