How to Repair Cordless Lawn Mowers

Whether you’ve purchased the best cordless lawn mower from a store or you’ve ordered it online, it is usually covered under its manufacturer’s warranty for a certain period of time. If your mower has warranty, it is definitely your best bet whenever you need replacement or repair for your it.

Also, if you have an arranged service plan on your cordless mower, all you have to do is to get in touch with the service provider whenever you need your mower to be inspected and repaired. They’d then refer you to a partner repair shop and reimburse you for any repair or replacement cost.

But what if you don’t have a warranty claim nor a service plan on your cordless lawn mower? If you’re a natural mechanic, or if you enjoy fixing  things up, you may try to repair your machine on your own. Just keep in mind, however, that any tampering on your product may void its warranty. So, it’s best to try self-repair only when your lawn mower is not covered under warranty anymore.

In this guide, we will be covering some of the most common problems that you may encounter with your cordless electric lawn mower and how to fix each one of them.


If your lawn mower battery can’t store enough energy to keep your mower operating, then you need to inspect and clean up its connection to the mower’s engine. If you find dirt all over the battery outlet, cleaning it can do the trick. But if it isn’t the case, then you can consider replacing the the battery.


A cordless lawn mower battery  typically lasts for around five to seven years. If your battery has already exceeded its lifespan, then it has to be replaced. But before you can set up your new battery, it needs to be properly charged first.

How do you replace the battery?

Step 1:

Place the new battery on a dry and elevated surface. Be careful no to let the it get wet as it charges.

Step 2:

Connect each of the battery’s socket to the connection lines of the battery charger.

Step 3:

Find a secure electrical outlet such as a ground-fault circuit interrupter (GFCI) where you can plug the connection line of the battery.
Step 4:

Battery chargers typically have light indicators that tell whether the battery is still charging or fully charged. Say, if the light turns from red to green,  that means the battery has been fully charged already. From time to time, check the battery charger indicator.

After the battery gets fully charged, unplug the battery charger from the electrical outlet and from the battery itself.
Step 5:

Release the battery lock on your cordless lawn mower. Plug the battery cords to the battery terminals. Remember to always start with the positive (+) cable first when re-connecting the cables onto the battery terminals.

Step 6:

Secure the new battery in the battery holder and get your voltmeter to test it to make sure that it works fine.


When replacing your lawn mower battery, make sure you get the right battery for your specific lawn mower model. Also, batteries get corroded over time so you may want to have a regular inspection. Charging your battery correctly ensures its maximum performance.


Here are some useful tips to take care of your lawn mower battery.

  • See to it that your battery is always charged at around 50 to 70 percent of its capacity. Avoid deep draining as it can permanently damage it and decrease battery life.  
  • Avoid storing your battery idle for too long. Battery life is also shortens with lack of use.


  • Don’t expose batteries to moisture. Batteries tend to last longer if they are stored in a cool dry and climate controlled area.
  • Store batteries properly to prevent mechanical damage and keep it from moisture. Secure the terminals with plastic enclosure to protect the battery from short circuiting.
  • Overheating the battery can make a battery explode. Don’t store it in overheated storage area, car or attic.
  • In order to know if your battery is still in good working condition, you can check with a digital multimeter. If you measured a voltage that’s around its real capacity then it will still work fine. However, if you have a reading lower than the battery’s capacity, you will have to replace the battery.


Battery Charger

Usually, battery chargers fail due to a burnt fuse or other parts. To take a closer look, you can open the charger inspect for any sign of damage. Using a digital multimeter, measure the resistance of the fuse. If the fuse has zero resistance, that means it is already in short circuit. Replacing the component can make it work again. Also, it is best to check the wires for any visible wear and tear that can be replaced easily.


With frequent use, mowers often have clogged vents. This is one of the most common issues that arise as you work with your lawn mower. Clogged vents prevent air from reaching the engine, causing it to overheat and get permanently damaged. To fix this, you will just have to remove the cover of your lawn mower and clean all the accumulated gunk that clogged the vents. If it is not possible to remove the cover, then you may have to use high-power blower to clear the vents.

Final Notes

Most cordless electric lawn mowers come with a warranty on them. Warranties can be pretty useful when your machine gets damaged, but if it has already expired or if you have an old lawn mower to be fixed, you’re free to repair it on your own. If you’re a tinkerer, this can be a good way to spend the day. Being able to repair things on your own may be risky but it will really be fulfilling once you identified the problem and came up with a practical solution.

We hope that these common cordless mower issues and fixes that we have presented in this guide has helped you to learn how to start fixing.

You may also enjoy Cordless lawn mower versus gas or How does a cordless lawn mower work

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