Why won't my M340i battery stay charged?

A battery is in its final hour when it will no longer hold a charge. The battery might be old. Or, you’ve been leaving the doors slightly open and the cabin light at night. Stop by for a free battery test at your nearest Firestone Complete Auto Care and learn more about your battery's charge.

What happens to my old M340i battery?

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

How much will replacing my BMW M340i’s battery cost if I get a DieHard battery?

Get affordable prices on BMW M340i 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.

How long can I expect my car battery to last?

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 M340i’s battery post?

A chemical reaction between battery acid and the air can cause a white, crusty buildup to form on the terminals of your M340i car battery. This buildup — known as corrosion — can impede the flow of electricity and cause a range of issues, from poor performance to premature battery failure.

How do I clean corrosion off my M340i vehicle 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 M340i owner’s manual for instructions on how to do so.

Where can I purchase M340i batteries near me?

At Firestone Complete Auto Care, we make it easy to get a new car battery. Our stores sell and install M340i batteries, and our Firestone Direct mobile vans can even come to you for added convenience. Check out our mobile battery services to learn more.

2020 BMW M340i Car Batteries

Get a New BMW Battery

Get a Battery for Your BMW M340i

Don't let a failing battery slow you down. Shop replacement batteries for 2020 BMW M340is today and schedule a quick installation at Firestone Complete Auto Care.

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2020 BMW M340i Battery Replacement & Size

Not sure what battery to get for your BMW M340i? Use the following chart to find information on BMW M340i battery size and cold cranking amps.

Battery	Engine	Warranty		Cold Cranking Amps
H8-AGM	L6/3.0L	Replacement 36 months	Performance months	900

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

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Buying a Replacement Battery for BMW M340i

Sadly, your BMW M340i 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 BMW M340i stranded. Look out for symptoms of a faulty car battery. A slow engine crank, an illuminated battery or check engine light, swollen battery case, corroded battery posts, or faded headlights may all indicate that your battery is on its last leg.

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. Stop by for a free battery test and, if needed, a replacement battery for your 2020 BMW M340i. Car batteries are only one of our many strong suits. Our technicians are familiar with BMW-specific recommendations for M340i car batteries’ reserve capacities and cold cranking amps. Get help figuring out the battery size that matches your vehicle, and schedule a weekday or weekend battery replacement service for your car.

Firestone Has DieHard Batteries for M340is

We know what’s best for your BMW M340i, which is why we carry just that. Your M340i needs a reliable, durable and powerful battery in extremely hot and cold environments. DieHard batteries shatter expectations and house the latest technology to fuel the increasing power requirements of modern vehicles Don't call a DieHard battery ordinary. It's an extraordinary battery. Buy a DieHard battery for your BMW M340i and get behind the wheel with confidence. Why? Because performance will be there when you need it most. That’s why you should choose batteries from Firestone Complete Auto Care.

Caring for a New BMW M340i Battery

Have you recently had a fresh battery installed in your BMW M340i? Great job! Give your new car battery the best start with proper care. turning off all of the lights when you leave your vehicle, decreasing the number of short trips you take, keeping your battery posts clean, and not playing the radio or using other electronics when the engine is turned off.

Commonly Asked M340i Battery Questions

Turn to Firestone Complete Auto Care for answers to all your car battery questions. If you have a battery question that's unique to your BMW M340i battery, stop by your nearest store. Our technicians have the answers.

Why won't my M340i battery stay charged? A battery is in its final hour when it will no longer hold a charge. The battery might be old. Or, you’ve been leaving the doors slightly open and the cabin light at night. Stop by for a free battery test at your nearest Firestone Complete Auto Care and learn more about your battery's charge.
What happens to my old M340i battery? We recycle it, taking care of both your car and the Earth.
How much will replacing my BMW M340i’s battery cost if I get a DieHard battery? Get affordable prices on BMW M340i 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.
How long can I expect my car battery to last? 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 M340i’s battery post? A chemical reaction between battery acid and the air can cause a white, crusty buildup to form on the terminals of your M340i car battery. This buildup — known as corrosion — can impede the flow of electricity and cause a range of issues, from poor performance to premature battery failure.
How do I clean corrosion off my M340i vehicle 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 M340i owner’s manual for instructions on how to do so.
Where can I purchase M340i batteries near me? At Firestone Complete Auto Care, we make it easy to get a new car battery. Our stores sell and install M340i batteries, and our Firestone Direct mobile vans can even come to you for added convenience. Check out our mobile battery services to learn more.