Why doesn’t my 300E battery stay charged?

A car battery that needs to be jump-started every time is as good as dead. The battery might be old. Or, you’ve been leaving the doors slightly open and the dome lights on during the night. Stop by for a complimentary battery check at your local Firestone Complete Auto Care and learn more about your battery's charge.

What do you do with my dead 300E battery?

We’ll recycle your car battery for you!

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

Get affordable prices on Mercedes-Benz 300E batteries by using one of our limited-time battery deals. Plus, all DieHard car batteries come with a free replacement warranty and extra coverage with DieHard Assurance.

What is the average lifespan of a car battery?

You can usually get three to five years out of your car battery. However, battery type, how well you maintain your battery, and your driving habits can all affect your battery’s lifespan.

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

The white, crusty stuff that can accumulate around 300E 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 remove corrosion from 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 find a battery for my 300E?

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

1991 Mercedes-Benz 300E Car Batteries

Get a New Mercedes-Benz Battery

Get a New Mercedes-Benz 300E Battery

Don’t let a dead battery stop you. Shop replacement car batteries for your 1991 Mercedes-Benz 300E at Firestone Complete Auto Care.

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Battery Size & Replacement for 1991 Mercedes-Benz 300E

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

Battery	Engine	Warranty		Cold Cranking Amps
91-1	L6/2.6L	Replacement 24 months	Performance months	615
48H6	L6/2.6L	Replacement 36 months	Performance months	730
H6-AGM	L6/2.6L	Replacement 36 months	Performance months	760
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
L6/2.6L - Battery: 91-1 - Warranty: Replacement 24 months, Performance months - Cold Cranking Amps: 615
L6/2.6L - Battery: 48H6 - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 730
L6/2.6L - Battery: H6-AGM - Warranty: Replacement 36 months, Performance months - Cold Cranking Amps: 760
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

Your 300E 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 300E battery before it fails and leaves you stranded. Watch for signs that your current battery is getting too old or too weak. A sluggish engine start, an illuminated check engine light or battery signal, swollen battery case, corroded battery terminals, and subpar electrical performance can all signal that your battery is on its last leg.

Or, you can get a complimentary battery check at your nearest Firestone Complete Auto Care. With computerized testing we can see how much charge is left in your battery. Drop in for a free battery check and, if needed, get your Mercedes-Benz 300E a replacement battery. Car batteries are one of our many specialties! Our expert technicians understand Mercedes-Benz service recommendations for 300E car batteries’ reserve capacities and cold cranking amps. Get help identifying the type and size of battery that fits your car perfectly, and schedule a weekday or weekend battery replacement service for your car.

Firestone Has DieHard Batteries for 300Es

We only want what’s best for your Mercedes-Benz 300E, which is why we exclusively carry the best. You need a reliable, durable and powerful battery in extremely hot and cold environments. DieHard 300E batteries surpass expectations using state-of-the-art advancements to meet the growing power demands of new vehicles. A DieHard battery isn't an ordinary car battery. It's extraordinary. Choose a DieHard battery for your Mercedes-Benz 300E and get behind the wheel with confidence. Why? Because your battery will perform when you need it. That’s why you should choose batteries from Firestone Complete Auto Care.

Caring for a New Mercedes-Benz 300E Battery

Have you recently had a fresh battery installed in your Mercedes-Benz 300E? Great job! Give your new car battery the best start with proper care. You can take care of your battery by limiting short trips, keeping your battery posts clean, and not using electronics such as the radio and power outlets when the engine is 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 battery questions that are Mercedes-Benz 300E-specific, pay us a visit. Our expert techs have the answers you need.

Why doesn’t my 300E battery stay charged? A car battery that needs to be jump-started every time is as good as dead. The battery might be old. Or, you’ve been leaving the doors slightly open and the dome lights on during the night. Stop by for a complimentary battery check at your local Firestone Complete Auto Care and learn more about your battery's charge.
What do you do with my dead 300E battery? We’ll recycle your car battery for you!
How much do DieHard batteries cost for your Mercedes-Benz 300E? Get affordable prices on Mercedes-Benz 300E batteries by using one of our limited-time battery deals. Plus, all DieHard car batteries come with a free replacement warranty and extra coverage with DieHard Assurance.
What is the average lifespan of a car battery? You can usually get three to five years out of your car battery. However, battery type, how well you maintain your battery, and your driving habits can all affect your battery’s lifespan.
What is the white, crusty substance accumulating on my 300E’s battery post? The white, crusty stuff that can accumulate around 300E 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 remove corrosion from 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 find a battery for my 300E? Your local Firestone Complete Auto Care sells and installs 300E batteries in your neighborhood. Our Firestone Direct mobile vans can even come to you and do it! Learn more about mobile battery services.