Why won’t my 420SEL battery hold a charge?

A car battery that needs to be jump-started every time is as good as dead. The battery may be too old. Or, you’ve been leaving the doors slightly open and the lights on overnight. Stop in for a free battery check at your nearest Firestone Complete Auto Care and learn more about your battery's charge.

What happens to my old 420SEL battery?

We’ll recycle your car battery for you!

How much will replacing my Mercedes-Benz 420SEL’s battery cost if I get a DieHard battery?

Mercedes-Benz 420SEL 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.

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.

Why is there white, flaky stuff around my 420SEL’s battery post?

The white, crusty stuff that can accumulate around 420SEL car battery terminals is called corrosion. It is caused by a chemical reaction between the battery acid and the air, which creates a white, powdery substance that can build up on the terminals over time. Corrosion can interfere with the flow of electricity between the battery post and the car's electrical system, sometimes leading to poor electrical performance, difficulty starting, and even premature battery failure.

What do I do about corrosion on my 420SEL car battery?

You can help prevent or get rid of corrosion by regularly inspecting and cleaning your battery terminals. Before cleaning your battery, see your 420SEL 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.

Where can I find a battery for my 420SEL?

At Firestone Complete Auto Care, we make it easy to get a new car battery. Our stores sell and install 420SEL batteries, and our Firestone Direct mobile vans can even come to you for added convenience. Check out our mobile battery services to learn more.

Car Batteries for 1991 Mercedes-Benz 420SEL

Get a New Mercedes-Benz Battery

Get a Battery for Your Mercedes-Benz 420SEL

Don’t let a dead battery stop you. Shop replacement car batteries for your 1991 Mercedes-Benz 420SEL at Firestone Complete Auto Care.

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The Right Battery Size for a 1991 Mercedes-Benz 420SEL

Researching battery replacements for your Mercedes-Benz 420SEL? Use the following chart to find information on Mercedes-Benz 420SEL battery size and cold cranking amps.

Battery	Engine	Warranty		Cold Cranking Amps
93-1	V8/4.2L	Replacement 24 months	Performance months	825
49H8	V8/4.2L	Replacement 36 months	Performance months	900
H8-AGM	V8/4.2L	Replacement 36 months	Performance months	900

BATTERIES
V8/4.2L - Battery: 93-1 - Warranty: Replacement 24 months, Performance months - Cold Cranking Amps: 825
V8/4.2L - Battery: 49H8 - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 900
V8/4.2L - Battery: H8-AGM - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 900

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Buy the Right Battery for Your Mercedes-Benz 420SEL

Your 420SEL doesn't have an expiration date, but its battery does. The average car battery lasts three to five years. You want to replace your 1991 Mercedes-Benz 420SEL battery before it fails and leaves you stranded. Pay attention to clues that your battery is on its way out. A lagging starter, a blinking battery or check engine light, swollen battery case, corroded battery terminals, or dim headlights may all indicate that your battery is waving goodbye.

You can also get a Free Battery Test at your local Firestone Complete Auto Care. Our equipment can see how much charge is left in your battery. Stop by for a free battery test and, if needed, get your Mercedes-Benz 420SEL a replacement battery. Car batteries are one of our many specialties! Our expert technicians understand Mercedes-Benz service recommendations for 420SEL battery cold cranking amps and reserve capacity. Get help choosing the battery size that matches your vehicle, and schedule a weekday or weekend battery replacement service for your car.

Find the Right DieHard Battery for Your 420SEL

We know what’s best for your Mercedes-Benz 420SEL, which is why we carry just that. You need a reliable, durable and powerful battery in even the most extreme conditions. DieHard batteries go above and beyond and house the latest technology to meet the increasing power requirements of new vehicles. Don't call a DieHard battery ordinary. It's an extraordinary battery. Buy a DieHard battery for your Mercedes-Benz 420SEL and drive with confidence knowing that performance will be there when you're counting on it. That’s why you should choose batteries from Firestone Complete Auto Care.

Caring for a New Mercedes-Benz 420SEL Battery

Have you recently had a fresh battery installed in your Mercedes-Benz 420SEL? Great job! 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 the battery posts corrosion-free, and avoiding radio and electronic component use when the engine is off.

Answers to Your 420SEL Car Battery Questions

Turn to Firestone Complete Auto Care for answers to all your car battery questions. If you have a 420SEL-specific battery question, pay us a visit. Our technicians have the answers.

Why won’t my 420SEL battery hold a charge? A car battery that needs to be jump-started every time is as good as dead. The battery may be too old. Or, you’ve been leaving the doors slightly open and the lights on overnight. Stop in for a free battery check at your nearest Firestone Complete Auto Care and learn more about your battery's charge.
What happens to my old 420SEL battery? We’ll recycle your car battery for you!
How much will replacing my Mercedes-Benz 420SEL’s battery cost if I get a DieHard battery? Mercedes-Benz 420SEL 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.
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.
Why is there white, flaky stuff around my 420SEL’s battery post? The white, crusty stuff that can accumulate around 420SEL car battery terminals is called corrosion. It is caused by a chemical reaction between the battery acid and the air, which creates a white, powdery substance that can build up on the terminals over time. Corrosion can interfere with the flow of electricity between the battery post and the car's electrical system, sometimes leading to poor electrical performance, difficulty starting, and even premature battery failure.
What do I do about corrosion on my 420SEL car battery? You can help prevent or get rid of corrosion by regularly inspecting and cleaning your battery terminals. Before cleaning your battery, see your 420SEL 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.
Where can I find a battery for my 420SEL? At Firestone Complete Auto Care, we make it easy to get a new car battery. Our stores sell and install 420SEL batteries, and our Firestone Direct mobile vans can even come to you for added convenience. Check out our mobile battery services to learn more.