Why won’t my 300CD 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 cabin light at night. Stop in for a free battery check at your local Firestone Complete Auto Care to learn more about the state of your battery.

What do you do with my old 300CD battery?

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

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

You can find affordable 300CD 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?

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 300CD’s battery post?

The white, crusty stuff that can accumulate around 300CD 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 300CD 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 300CD?

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

1985 Mercedes-Benz 300CD Car Batteries

Get a New Mercedes-Benz Battery

Get a Battery for Your Mercedes-Benz 300CD

The middle of nowhere is the wrong place to have a weak battery. Shop replacement batteries for 1985 Mercedes-Benz 300CD today and schedule a quick installation at Firestone Complete Auto Care.

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The Right Battery Size for a 1985 Mercedes-Benz 300CD

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

Battery	Engine	Warranty		Cold Cranking Amps
93-1	L5/3.0L	Replacement 24 months	Performance months	825
T8	L5/3.0L	Replacement 36 months	Performance months	800
H8-AGM	L5/3.0L	Replacement 36 months	Performance months	900

BATTERIES
L5/3.0L - Battery: 93-1 - Warranty: Replacement 24 months, Performance months - Cold Cranking Amps: 825
L5/3.0L - Battery: T8 - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 800
L5/3.0L - 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 300CD

Your 300CD doesn't have an expiration date, but its battery does. Generally, car batteries last from three to five years. You want to replace your 1985 Mercedes-Benz 300CD battery before it fails and leaves you stranded. Pay attention to clues that your battery is on its way out. A sluggish engine start, a blinking battery or check engine light, bloated battery case, corrosion-covered posts, or weak lights can all signal 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. Drop in for a free battery check and, if needed, a replacement battery for your 1985 Mercedes-Benz 300CD. Automotive batteries are just one of our many areas of expertise. Our expert technicians understand Mercedes-Benz service recommendations for 300CD battery cold cranking amps and reserve capacity. Get help identifying the type and size of battery that's best for your 300CD, and schedule a weekday or weekend battery replacement service for your car.

Is There a DieHard Battery for 300CDs?

Your Mercedes-Benz 300CD deserves the best, which is why we carry just that. You need a reliable, durable and powerful battery in extremely hot and cold environments. DieHard batteries go above and beyond using the latest innovative technology to satisfy the growing power demands of new vehicles and their accessories. A DieHard battery isn't an ordinary car battery. It's extraordinary. Choose a DieHard battery for your Mercedes-Benz 300CD and get behind the wheel with confidence. Why? Because 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 300CD Battery

Got a new car battery installed in your 1985 Mercedes-Benz 300CD? Great job! Now, help it last longer and stay charged by caring for it from the get-go. ensuring all the lights are turned off before you leave the car, limiting short trips, keeping your battery posts clean, and not playing the radio or using other electronics when the engine is turned off.

Commonly Asked 300CD Battery Questions

Get answers to common car battery questions, from Firestone Complete Auto Care. If you have a battery question that's unique to your Mercedes-Benz 300CD battery, stop by your nearest store. Our expert techs have the answers you need.

Why won’t my 300CD 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 cabin light at night. Stop in for a free battery check at your local Firestone Complete Auto Care to learn more about the state of your battery.
What do you do with my old 300CD battery? We recycle it, taking care of both your car and the Earth.
How much do DieHard batteries cost for your Mercedes-Benz 300CD? You can find affordable 300CD 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? 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 300CD’s battery post? The white, crusty stuff that can accumulate around 300CD 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 300CD 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 300CD? Your local Firestone Complete Auto Care sells and installs 300CD batteries in your neighborhood. Our Firestone Direct mobile vans can even come to you and do it! Learn more about mobile battery services.