Why won’t my S420 battery hold a charge?

A battery that won't hold a charge is almost as good as dead. The battery might be old. Or, you may have a habit of leaving your car doors open and the cabin light at night. Stop in for a free battery check at your favorite Firestone Complete Auto Care and learn more about your battery's charge.

What happens to my old S420 battery?

We’ll recycle your car battery for you!

How much will replacing my Mercedes-Benz S420’s battery cost if I get a DieHard battery?

You can find affordable S420 batteries by using one of our car battery coupons, when available. Plus, every DieHard battery comes with extra coverage thanks to DieHard Assurance and a free replacement warranty.

What is the average lifespan of a car battery?

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 S420’s battery post?

The white, crusty stuff that can accumulate around S420 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.

How do I clean corrosion off my S420 vehicle battery?

Regularly inspecting and cleaning your battery terminals will help keep your S420’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 S420 batteries near me?

When you need a new battery for your vehicle, Firestone Complete Auto Care is here to help. We sell and install S420 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.

Car Batteries for 1999 Mercedes-Benz S420

Get a New Mercedes-Benz Battery

Get a New Mercedes-Benz S420 Battery

Don’t let a dead battery stop you. Shop replacement car batteries for your 1999 Mercedes-Benz S420 at Firestone Complete Auto Care.

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Battery Size & Replacement for 1999 Mercedes-Benz S420

Not sure what battery to get for your Mercedes-Benz S420? Check the chart to find the right car battery size and cold cranking amps for your S420.

Battery	Engine	Warranty		Cold Cranking Amps
H8-AGM	V8/4.2L	Replacement 36 months	Performance months	900

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

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Shopping for Mercedes-Benz S420 Car Batteries

Sadly, your Mercedes-Benz S420 won't last forever. Neither will its battery. On average, auto batteries last anywhere from three to five years. Check your battery regularly and replace it as needed so it doesn’t leave you and your Mercedes-Benz S420 stranded. Pay attention to clues that your battery is on its way out. A sluggish engine start, an illuminated battery or check engine light, bloated battery case, corroded battery terminals, or dim headlights can all signal that your battery needs attention.

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. Visit us for a complimentary battery check and, if necessary, a battery replacement to help keep your 1999 Mercedes-Benz S420 running! Automotive batteries are just one of our many areas of expertise. Our technicians are familiar with Mercedes-Benz-specific recommendations for S420 car batteries’ reserve capacities and cold cranking amps. Get help choosing the battery size that matches your vehicle, and schedule a fast car battery replacement at your earliest convenience.

Is There a DieHard Battery for S420s?

We know what’s best for your Mercedes-Benz S420, which is why we only carry top-of-the-line replacement parts and batteries. Your vehicle needs a reliable, durable and powerful battery in extremely hot and cold environments. DieHard S420 batteries surpass expectations using the latest innovative technology to meet the increasing power requirements of modern vehicles A DieHard battery isn't an ordinary car battery. It's extraordinary. Choose a DieHard battery for your Mercedes-Benz S420 and drive with confidence knowing that your battery will perform when you need it. That’s why you should choose batteries from Firestone Complete Auto Care.

Making Your S420’s New Battery Last

Got a new car battery installed in your 1999 Mercedes-Benz S420? Congrats! Now, help it last longer and stay charged by caring for it from the get-go. turning off all of the lights when you leave your vehicle, decreasing the number of short trips you take, cleaning your battery posts, and not playing the radio or using other electronics when the engine is turned off.

Commonly Asked S420 Battery Questions

Firestone Complete Auto Care has answers to your top car battery questions. If you have a S420-specific battery question, stop by your nearest store. Our expert techs have the answers you need.

Why won’t my S420 battery hold a charge? A battery that won't hold a charge is almost as good as dead. The battery might be old. Or, you may have a habit of leaving your car doors open and the cabin light at night. Stop in for a free battery check at your favorite Firestone Complete Auto Care and learn more about your battery's charge.
What happens to my old S420 battery? We’ll recycle your car battery for you!
How much will replacing my Mercedes-Benz S420’s battery cost if I get a DieHard battery? You can find affordable S420 batteries by using one of our car battery coupons, when available. Plus, every DieHard battery comes with extra coverage thanks to DieHard Assurance and a free replacement warranty.
What is the average lifespan of a car battery? 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 S420’s battery post? The white, crusty stuff that can accumulate around S420 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.
How do I clean corrosion off my S420 vehicle battery? Regularly inspecting and cleaning your battery terminals will help keep your S420’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 S420 batteries near me? When you need a new battery for your vehicle, Firestone Complete Auto Care is here to help. We sell and install S420 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.