How to charge lawnmower battery with car?

How to Charge Lawnmower Battery with a Car? (Step by Step Guide)

For your lawnmower, winter is never a good season. Not only you can’t cut those lovely grasses on the lawn, but it can also damage the battery of your lawnmower. Fortunately, when the mowing season comes, you can use a car to bring it back to life and make the lawnmower roar (and cut) again.

As a lawnmower user, you must take care of the lawnmower and understand all the details of the lawnmower. Trust me, no one is going to help you like yourself!

If you don’t know the detailed information about the lawnmower, then a small problem will become a big problem for you. You may find that the lawnmower battery is not charging properly. Remember that if the battery is not charged properly, the lawnmower cannot be started.

Check this guide to know how much time it takes to charge a lawnmower battery.

So what do you think? Is your lawnmower malfunctioning? Absolutely not. The lawnmower battery can be easily charged by using the car battery. You can only do this at home if you follow some steps. Now comes the crucial fact, do you have any idea about how to charge the lawnmower battery with a car? If “No”, there is no need to worry.

In this article, you will find all the necessary guidelines for using a car to charge the lawnmower battery. So without wasting any time,  let’s start.

The process of charging the lawn mower battery with a car:

This process is called quick start. It takes about 5-6 minutes to complete the charging task. With quick start, you can easily turn on the power of your lawnmower.

First let us know the tools that will help us. You don’t need too many tools to complete the task.

To charge the lawnmower battery with a car,  only a modern battery charger is needed. You will find different types of battery chargers in electrical stores or car shops.

Choose the one that suits you best.

For safety, please don’t forget to wear gloves and goggles. You can also wear a protective cloth to protect yourself.

Steps to follow:

Move the lawnmower, close to the car

First, place the lawnmower on a flat surface. Set it to parking mode. Move the lawnmower close to the car to facilitate charging.

Turn off the car

Turn off the power to the car. Also set the car to parking mode. Pull up the front hood to find the battery compartment.

Locate the lawnmower battery

Locate the lawnmower battery. If you are a riding lawnmower user, most lawnmower’s have batteries under the seat.

Disconnect the Battery:

Disconnect the battery from the power cord. This will save you from accidentally energizing.

Check the battery voltage

Check the voltage of the lawnmower battery. Most lawn mowers use 12-volt batteries.
Also check the voltage of the car battery. If the voltages are not equal, the battery may explode when charging starts.

Connect the charging cable

Now, it’s time to connect the charging cable and the battery. If you look closely, you will find that there are two terminals in each battery.
One terminal is the positive (+) and the other terminal is the negative (-). The color of the positive terminal is red, and the color of the negative terminal is black.
Connect the red terminal of the lawnmower battery to the red terminal of the car battery and connect the black terminal of the lawnmower battery to the black terminal of the car battery again.
Use the battery charging cable to connect the edges carefully.

Test and disconnect the cable

Turn on the lawnmower this time. If the lawnmower does not turn on, please let the battery fully charge for a while. After charging, try to turn on the lawnmower again.
When the lawnmower is turned on, carefully disconnect the battery charging cable. Excess power may damage the lawnmower battery.
Done! Now you can use the lawnmower as before.

Future tips:

  • There is no need to charge the lawnmower battery all the time. But sometimes charging the battery will increase the durability of the battery.
  • When storing the mower in winter, charge the battery.
  • Please charge the battery when you reuse the lawn mower in early spring.


  • Before starting work, please read the user manual of the battery charger to avoid any unnecessary situations.
  • Check the battery voltage carefully, because the battery explosion is a very serious matter.
  • When doing this kind of work, please keep the children away.


If you have experience, charging the lawnmower battery with a car can make it easy for you to operate.

However, if you don’t feel comfortable, please do not do it yourself. Contact with an expert mechanic will make your job easier.

Please always follow the warnings to avoid any danger. When disposing of the battery, any type of accident can cause serious damage.

I hope you can learn from this article how to charge the lawnmower battery with a car.

Now, it’s your turn. Take a breath and start replacing the lawnmower battery yourself!

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