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How to Charge a Riding Lawn Mower Battery: 5 Easy Steps

Unleash your DIY skills with this step-by-step guide on how to charge a riding lawn mower battery — from locating it, to charging it, to reinstalling it.

After learning about learning about charging riding lawn mowers, discover how to charge a lawn mower battery on any type of lawn mower.

how to charge a riding lawn mower battery

Image credit: Erik Mclean/Pixabay

When it comes to charging, you should know that most riding lawn mowers function on a 12-volt battery system. The voltage refers to the force of electricity that flows from the battery through your machine. Check which battery you have and make sure you have a good charger for that battery.

  • Battery charger
  • Gloves
  • Safety glasses

1. Safety

Put on gloves and safety glasses in case there will be any sparks that can damage your skin or eyes.

2. Locate the Battery

On most ride-on lawn mowers, the battery is located under the seat.

3. Connect the Charger

Attach the red positive (+) cable from your charger to the positive terminal of your mower’s battery.

Attach the black negative (-) cable to either a metal part of your mower away from the battery or directly on negative terminal of your battery if recommended by manufacturer instructions.

4. Set the Charger to the Correct Voltage and Amp Level

If your charger lets you adjust the voltage and amp level – change the volts to the same as your battery and the amp level to 10 or lower to not damage the battery.

5. Plug in the Charger Into a Wall Outlet

Plug in your charger into a power outlet and switch it on to start charging the battery. You should see some form of indicator light or audible signal from the charger confirming that it is now charging.

6. Disconnect the Charger

Disconnect the charger from the battery when the battery is full. You will sew when it’s done on the indicator lights.

Mower refuses to start

If you find that your mower refuses to start even after connecting it to the charger, it might be due to a faulty connection or an improperly connected charger. Check if the battery terminals are clean and the charger is accurately connected.

Match voltage and amp levels with battery

Ensure that the voltage setting on your charger matches that of your mower battery which is typically a 12-volt.

Slow charging

If charging seems unusually slow or quick, this could be a sign of an issue with either the amp setting on your charger or with the battery itself. A standard lawn mower battery should ideally take about five hours for a full charge using a 10-amp charger but if this isn’t happening for you, then consider checking the amp settings on your charger.

Lawn mower left out over winter

If you’ve left your mower out in frigid temperatures over winter or not used it for an extended period, chances are its battery has become deeply discharged which can make recharging quite challenging. In such instances, you could try using a ‘battery maintainer’ which supplies a small amount of current continuously – this can oftentimes put such stubborn batteries back into life.

After a while, despite your efforts to maintain and charge your mower’s battery, there will come a time when you must replace it. Most lawn mowers require a fresh battery every three to five years.

However, there are more signs that your mower’s battery is nearing its end.

When you have to recharge the battery often

If you find yourself repeatedly having to jump-start or charge the battery before every use, it may be time for a new one.

Loss in power

Similarly, if the mower struggles to start or can’t maintain its power level while running, it could be due to a failing 12-volt battery. A visual inspection can also give you clear indications about whether or not your battery needs replacing.

How often should I charge my riding lawn mower battery?

It is recommended to charge your riding lawn mower battery at the beginning and end of the mowing season. Additionally, if you notice the battery struggling to start the mower, it may need a charge.

Is it safe to charge my riding lawn mower battery while it’s still connected to the mower?

It is generally safe to charge the battery while it is still connected to the mower, but ensure the mower is turned off and parked in a well-ventilated area. Always follow the manufacturer’s instructions for safety.

Can I use a car battery charger to charge my riding lawn mower battery?

While it is possible, it’s important to ensure the charger is compatible with the lawn mower battery’s voltage and amperage requirements. A dedicated lawn mower battery charger is usually safer and more effective.

What should I do if my battery won’t charge?

Check for corroded or loose connections, ensure the charger is working properly, and verify that the battery terminals are clean. If the battery still won’t charge, it might need to be replaced.

How can I extend the life of my riding lawn mower battery?

Regularly charge the battery, keep it clean and free from corrosion, store it in a cool, dry place during off-season, and avoid deep discharges.

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