Why won't my 300SEL 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 been leaving your car doors ajar and the lights on overnight. Stop by for a free battery test at your favorite Firestone Complete Auto Care to learn more about the state of your battery.

What do you do with my old 300SEL battery?

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

How much do DieHard batteries cost for your Mercedes-Benz 300SEL?

You can find affordable 300SEL 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.

How often should I replace my 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, flaky stuff around my 300SEL’s battery post?

The white, crusty stuff that can accumulate around 300SEL 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 300SEL 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 purchase 300SEL batteries near me?

Your local Firestone Complete Auto Care sells and installs 300SEL batteries in your neighborhood. Our Firestone Direct mobile vans can even come to you and do it! Learn more about mobile battery services.

1989 Mercedes-Benz 300SEL Batteries

Get a New Mercedes-Benz Battery

Get a New Mercedes-Benz 300SEL Battery

The middle of nowhere is the wrong place to have a weak battery. Shop replacement batteries for 1989 Mercedes-Benz 300SEL today and schedule a quick installation at Firestone Complete Auto Care.

Shop Batteries

The Right Battery Size for a 1989 Mercedes-Benz 300SEL

Not sure what battery to get for your Mercedes-Benz 300SEL? Use the following chart to find information on Mercedes-Benz 300SEL battery size and cold cranking amps.

Battery	Engine	Warranty		Cold Cranking Amps
93-1	L6/3.0L	Replacement 24 months	Performance months	825
49H8	L6/3.0L	Replacement 36 months	Performance months	900
H8-AGM	L6/3.0L	Replacement 36 months	Performance months	900

BATTERIES
L6/3.0L - Battery: 93-1 - Warranty: Replacement 24 months, Performance months - Cold Cranking Amps: 825
L6/3.0L - Battery: 49H8 - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 900
L6/3.0L - Battery: H8-AGM - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 900

Schedule an Appointment

Shopping for Mercedes-Benz 300SEL Car Batteries

Sadly, your Mercedes-Benz 300SEL 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 300SEL 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, corrosion-covered posts, or dim headlights may all indicate that your battery is on its last leg.

Plus, at Firestone Complete Auto Care, we’ll test your battery for free. With computerized testing we can see how much charge is left in your battery. Visit us for a complimentary battery check and, if needed, a replacement battery for your 1989 Mercedes-Benz 300SEL. Car batteries are only one of our many strong suits. Our technicians are well-acquainted with Mercedes-Benz’s service specs for 300SEL battery cold cranking amps and reserve capacity. Get help choosing the battery size that's best for your 300SEL, and schedule a fast car battery replacement at your earliest convenience.

Why Choose a DieHard Battery for Your 300SEL?

We only want what’s best for your Mercedes-Benz 300SEL, which is why we exclusively carry the best. Your vehicle needs a reliable, durable and powerful battery in extremely hot and cold environments. DieHard batteries go above and beyond using the latest innovative technology to meet the growing power requirements of modern vehicles They're no ordinary battery, they're extraordinary. Go with a DieHard battery for your 300SEL and drive with confidence knowing that performance will be there when you're counting on it. That's the kind of battery we deliver.

Making Your 300SEL’s New Battery Last

Got a new car battery installed in your 1989 Mercedes-Benz 300SEL? Good thinking! Give your new car battery the best start with proper care. Help extend your car battery’s life by cutting back on unnecessary short trips, cleaning your battery posts, and avoiding radio and electronic component use when the engine is off.