Why won't my 300E battery stay charged?

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

What do you do with my dead 300E battery?

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

What’s the cost of DieHard batteries for Mercedes-Benz 300Es?

Mercedes-Benz 300E 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?

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.

What is the white, crusty substance accumulating on my 300E’s battery post?

The white, flaky stuff that can build up around your 300E’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 300E, 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 300E car battery?

To help extend the life of your battery, you should routinely inspect and clean the terminals using a baking soda and water mix, wire brush, and rag. Be sure to disconnect the battery cables before cleaning and check your 300E owner’s manual for instructions on how to do so.

Where can I purchase 300E batteries near me?

At Firestone Complete Auto Care, we make it easy to get a new car battery. Our stores sell and install 300E 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 1986 Mercedes-Benz 300E

Get a New Mercedes-Benz Battery

Get a New Mercedes-Benz 300E Battery

Don't let a failing battery slow you down. Shop replacement batteries for 1986 Mercedes-Benz 300Es today and schedule a quick installation at Firestone Complete Auto Care.

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Battery Size & Replacement for 1986 Mercedes-Benz 300E

Not sure what battery to get for your Mercedes-Benz 300E? Check the chart to find the right car battery size and cold cranking amps for your 300E.

Battery	Engine	Warranty		Cold Cranking Amps
91-1	L6/3.0L	Replacement 24 months	Performance months	615
48H6	L6/3.0L	Replacement 36 months	Performance months	730
H6-AGM	L6/3.0L	Replacement 36 months	Performance months	760

BATTERIES
L6/3.0L - Battery: 91-1 - Warranty: Replacement 24 months, Performance months - Cold Cranking Amps: 615
L6/3.0L - Battery: 48H6 - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 730
L6/3.0L - Battery: H6-AGM - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 760

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Buying a Replacement Battery for Mercedes-Benz 300E

You can pretty much drive your Mercedes-Benz 300E until you don't want to anymore. But your 300E's battery? Don't count on it to last forever. On average, auto batteries last anywhere from three to five years. Don’t get stranded by your 300E’s car battery. Replace it regularly instead! Look out for symptoms of a faulty car battery. A sluggish engine start, a blinking battery or check engine light, bloated battery case, corroded battery terminals, or weak lights may all indicate that your battery needs attention.

Plus, at Firestone Complete Auto Care, we’ll test your battery for free. With best-in-class tools we can tell you how much "life" is left in your battery. Visit us for a complimentary battery check and, if needed, a replacement battery for your 1986 Mercedes-Benz 300E. Car batteries are only one of our many strong suits. Our technicians are well-acquainted with Mercedes-Benz’s service specs for 300E battery cold cranking amps and reserve capacity. Get help figuring out the battery size that matches your vehicle, and schedule a fast car battery replacement at your earliest convenience.

Find the Right DieHard Battery for Your 300E

We only want what’s best for your Mercedes-Benz 300E, which is why we carry just that. Your 300E needs a reliable, durable and powerful battery in extremely hot and cold environments. DieHard batteries shatter expectations using the latest innovative technology to fuel the expanding power requirements of modern vehicles A DieHard battery isn't an ordinary car battery. It's extraordinary. Buy a DieHard battery for your Mercedes-Benz 300E and get behind the wheel with confidence. Why? Because performance will be there when you need it most. That's the kind of battery we deliver.

Making Your 300E’s New Battery Last

Got a new car battery installed in your 1986 Mercedes-Benz 300E? Congrats! Give your new car battery the best start with proper care. flipping the dome lights and headlights off when exiting the car, limiting short trips, keeping the battery posts corrosion-free, and not playing the radio or using other electronics when the engine is turned off.

Answers to Your 300E Car Battery Questions

Turn to Firestone Complete Auto Care for answers to all your car battery questions. If you have a 300E-specific battery question, stop by your nearest store. Our technicians are happy to help.

Why won't my 300E battery stay charged? A battery that won't hold a charge is almost as good as dead. The battery may be too old. Or, you may have a habit of leaving your car doors open and the cabin light at night. Stop by for a complimentary battery check at your nearest Firestone Complete Auto Care and get a handle on your car battery’s health.
What do you do with my dead 300E battery? We recycle it, taking care of both your car and the Earth.
What’s the cost of DieHard batteries for Mercedes-Benz 300Es? Mercedes-Benz 300E 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? 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.
What is the white, crusty substance accumulating on my 300E’s battery post? The white, flaky stuff that can build up around your 300E’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 300E, 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 300E car battery? To help extend the life of your battery, you should routinely inspect and clean the terminals using a baking soda and water mix, wire brush, and rag. Be sure to disconnect the battery cables before cleaning and check your 300E owner’s manual for instructions on how to do so.
Where can I purchase 300E batteries near me? At Firestone Complete Auto Care, we make it easy to get a new car battery. Our stores sell and install 300E batteries, and our Firestone Direct mobile vans can even come to you for added convenience. Check out our mobile battery services to learn more.