Why won't my 840i 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 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 to learn more about the state of your battery.

What do you do with my old 840i battery?

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

How much do DieHard batteries cost for your BMW 840i?

Get affordable prices on BMW 840i 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 do car batteries last?

A car battery normally lasts three to five years, but this number can vary based on battery type, your driving habits, and battery maintenance.

Why is there white, crusty buildup on my 840i’s battery post?

The white, crusty stuff that can accumulate around 840i 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 840i car battery?

Regularly inspecting and cleaning your battery terminals will help keep your 840i’s electrical system running smoothly. Before cleaning, reference your owner’s manual for instructions on how to disconnect the battery cables. Once the cables have been disconnected, gently clean the terminals with a mixture of water and baking soda, a wire brush, and a rag.

Where can I purchase 840i batteries near me?

At Firestone Complete Auto Care, we make it easy to get a new car battery. Our stores sell and install 840i batteries, and our Firestone Direct mobile vans can even come to you for added convenience. Check out our mobile battery services to learn more.

2021 BMW 840i Car Batteries

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BMW 840i Batteries Near You

The middle of nowhere is the wrong place to have a weak battery. Shop replacement batteries for 2021 BMW 840i today and schedule a quick installation at Firestone Complete Auto Care.

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Shopping for BMW 840i Car Batteries

Your 840i doesn't have an expiration date, but its battery does. The average car battery lasts three to five years. Don’t get stranded by your 840i’s car battery. Replace it regularly instead! Pay attention to clues that your battery is on its way out. A slow engine crank, an illuminated battery or check engine light, bloated battery case, corrosion-covered posts, or faded headlights may all indicate that your battery needs attention.

Or, you can get a complimentary battery check at your nearest 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, get your BMW 840i a replacement battery. Automotive batteries are just one of our many areas of expertise. Our technicians are well-acquainted with BMW’s service specs for 840i car batteries’ reserve capacities and cold cranking amps. Get help choosing the battery size that matches your vehicle, and schedule an appointment today for a quick car battery replacement.

Why Choose a DieHard Battery for Your 840i?

We know what’s best for your BMW 840i, which is why we only carry top-of-the-line replacement parts and batteries. Your vehicle needs a reliable, durable and powerful battery in even some of the toughest conditions. DieHard batteries shatter expectations using the latest innovative technology to satisfy the increasing power requirements of new vehicles. A DieHard battery isn't an ordinary car battery. It's extraordinary. Go with a DieHard battery for your 840i and get behind the wheel with confidence. Why? Because performance will be there when you're counting on it. That's the kind of battery we deliver.

Caring for a New BMW 840i Battery

Have you recently had a fresh battery installed in your BMW 840i? Good thinking! Give your new car battery the best start with proper care. Give your new battery a hand by decreasing the number of short trips you take, cleaning your battery posts, and avoiding radio and electronic component use when the engine is off.