How to Change a Lawn Mower Battery

The average lawn mower battery lasts 2 to 3 years with regular use. Learning how to change a lawn mower battery the right way could be the key to extending its lifespan and keeping your yard looking great.

Plus, you could save money in the long run — 20% of lawn mower repairs come down to battery failure! Follow Mowrator’s guide to learn how to change a lawn mower battery, as well as how to know when it needs replacing.

Key Takeaways

• Change the battery every 1 to 3 years, especially if it won't hold a charge, the mower won't start, there's visible wear, or it has been stored unused for long periods.
• Gather tools, prepare to work on a level, dry surface, and wear protective gear.
• Park on a flat surface, turn off the mower, engage the brake, remove and disconnect the old battery, install the new battery, and secure with a wrench.
• Regularly check and clean battery terminals, store in a cool, dry place, and keep the battery charged even during non-use periods.

When to Change Your Lawn Mower Battery

Is your lawn mower battery-powered? On average, you should change a 12V lawn mower battery every 1 to 3 years, depending on how often you use it. Here are some signs your lawn mower battery needs to be replaced:

• It’s no longer holding a charge
• Your mower isn’t starting
• There are visible signs of wear and tear on the battery
• It’s been in storage for a long time without use

Preparing to Change Your Lawn Mower Battery

Changing your lawn mower battery will go much faster if you’re prepared beforehand. Here’s what you’ll need to organize before you begin.

Tools and Equipment

• Wrench
• Protective gloves
• Safety goggles
• A stiff wire brush
• Dielectric grease

Safety Precautions

• Work on a level surface
• Make sure the surface is dry
• Wear protective gear
• Don’t rush!

Step-by-Step Guide to Replacing a Lawn Mower Battery

Follow these steps to change your lawn mower’s battery easily and safely. Good news — it's fairly simple!

Step 1: Preparation

Park your mower on a level surface. Make sure it’s dry and out of the way of any debris that could get into the battery compartment. Turn off the mower and put the parking brake on.

Find the battery compartment. It’s usually located under the seat near the engine, but some mowers might place it differently. You can check the owner's manual to find exactly where it is.

Step 2: Remove the Old Battery

You may find brackets, bungee cables, straps, or other security braces and covers on the battery. Remove these so you can access the battery and place them somewhere safe. It’s a good idea to give them a clean before you replace them later.

Disconnect the black terminal first (the negative cable). Next, disconnect the red (positive) terminal. Once both terminals are disconnected, carefully take the battery out. It could be heavy, so it might be helpful to have an extra set of hands.

Step 3: Install the New Battery

Check the battery compartment to make sure it’s clean. Once you’re sure it’s free from debris, carefully place the new battery into the compartment. Be careful not to pinch any wires as you place it, and make sure it’s solidly seated before connecting it again.

Connect the terminals in the reverse order: the positive terminal first (red), then connect the cable to the negative terminal (black). Use a wrench to make sure every connection is tight.

Apply dielectric grease generously to the terminals, to prevent them from corroding over time. Once that’s done, replace your security brackets and covers. Be sure to bolt them down firmly.

Step 4: Finish Off

Close the battery compartment and reattach any other displaced parts. You should consider giving your lawn mower seat a clean before you use it again!

Lawn Mower Battery Care and Maintenance

Extend the life of your mower battery by taking good care of it. Here are some of the Mowrator team’s expert tips on how to keep it in the best condition.

• Examine the battery terminals every month.
• Use baking soda and water with a wire brush to clean the terminals if necessary.
• Make sure the terminal connections are tight.
• Keep the terminals well-greased to prevent corrosion.
• Store the mower (or the battery) in a cool, dry place (68°F or 20°C).
• Safely charge the battery and regularly, even when you’re not using the mower.

Troubleshooting Common Battery Replacement Issues

The Mower Still Won't Start

If your lawn mower doesn't start, even after replacing the battery, check that the connections are correct and secure. Also, make sure the spark plugs are connected properly.

The New Battery Drains Quickly

If your new battery is draining faster than it should be, make sure the charging system is working correctly. If it is, check for electrical shorts in the mower.

Looking for more tips on changing lawn mower batteries? Contact Mowrator today. Our highly skilled team is here to answer all of your lawn mower battery queries.

FAQs on How to Change a Lawn Mower Battery

How Should I Dispose of a Lawn Mower Battery?

To dispose of a lawn mower battery, follow these steps:

1. Remove the Battery Safely: Turn off the lawn mower and disconnect the battery. Be sure to do so safely.
2. Store Properly: Place the battery in a secure, dry container to prevent leaks or damage.
3. Find a Disposal Site: Find a local recycling center or hazardous waste facility that accepts batteries. Many automotive parts stores also accept used batteries.
4. Transport Safely: Take the battery to the disposal site. Check that it’s securely packed to avoid any spills or contact with other metals.

Can Lawn Mower Batteries Be Recycled?

Yes, lawn mower batteries can be recycled. Most recycling centers and hazardous waste facilities accept them. The lead and other materials in these batteries can be reclaimed and reused, which goes a long way towards protecting the environment. Check with local facilities for specific recycling guidelines and drop-off locations.

If you found this information engaging, consider checking out our other articles that delve into Can I Leave Battery in Lawn Mower and Can You Jump a Lawn Mower Battery with a Car?

Back to Top: How to Change a Lawn Mower Battery