How To Charge Lawn Mower Battery

Regulator Rectifier Or Ground

Charging a Riding Lawn Mower Battery

The regulator-rectifier converts AC power from the charging coil to DC power and regulates the current being sent to the battery and ensures that the current being sent is balanced, stopping it from surging. The regulator-rectifier also has a ground circuit that protects the battery from being overcharged or receiving too much power at once. If the ground becomes disconnected or the regulator-rectifier fails, the battery will not receive any power and will not charge. Signs that this component is failing will be similar to that of a bad battery, so it is recommended to use a multimeter to test the current between the various components of the tractors electrical system to identify where the issue is.

How To Properly Charge The Lawn Mower Battery

Each battery-powered lawn mower comes with its charger and instructions on how to make the most of it.

A lot of advice, some of it contradictory, has circulated about whether to leave the battery on the charger at all times and whether to let the battery die completely before charging.

That means keeping the battery charged at 20 percent or more. Discharging it below this value accelerates fading or slow degradation of the battery.

And when charging, disconnect when reaching 100%.

How Long Does A Lawn Mower Battery Last

It is normal to expect a lawn mower battery to last a year or more. The battery life of a battery depends on many factors, including the type of battery, how it is charged and discharged, and how often it needs to be recharged.

For example, a lithium-ion battery can be charged up to 80% of its capacity in one hour, while a nickel-metal hydride battery will only last for about 30 minutes before needing a recharge. In general, the longer the battery has been in use the less likely it will need a re-charge.

Don’t Miss: Deck Plans Mariner Of The Seas

How Long Does It Take To Charge A Lawn Mower Battery With A Trickle Charger

Trickle chargers are commonly rated at 2 amps or less. These kinds of chargers are meant to charge batteries very slowly and they dont pose the risk of overcharging. In some cases, it could take your mower battery nearly 24 hours to charge completely with a trickle charger. But, its worth the wait if you have the time because charging batteries slowly helps extend their life. Just be sure that your trickle charger has a setting for the same voltage as your battery.

About Tom Greene

I’ve always had a keen interest in lawn care as long as I can remember. Friends used to call me the “lawn mower guru” , but I’m anything but. I just enjoy cutting my lawn and spending time outdoors. I also love the well-deserved doughnuts and coffee afterward!

Choosing A Battery Charger

How Long Does It Take To Charge A Lawn Mower Battery

The primary factor for which charger you choose is the voltage of the battery being charged. A typical modern lawn tractor will have a 12-volt battery to match the electrical system. Exceptions include lawn tractors that have been customized or modified by the owner or tractors that predate 1980, which use a 6-volt system and battery. Most battery chargers can handle a range of voltages, and may have a switch to allow you to select the voltage that matches your battery.

  • A lawn tractor battery operates in the same way as a car battery.
  • Without this, the battery would cease to function after each use almost and require continual external charging.

Your battery charger may also have additional charging options that may include any of the following: Trickle or fast-charging, a “jump” mode, timed charging or a 2-amp slow charge option. The 2-amp charge rate is generally the best option for lawn tractor battery recharging as it allows for a deep, thorough charge.

Read Also: Grow It Green Lawn Service

By Step Process On: How To Charge A Lawn Mower Battery Amps

Here I will explain you step by step process of how to charge a lawn mower battery amps? lets see how to charge a lawn mower battery amps.


To start, you will need to remove the battery from the lawn mower. Locate the black wire, or the negative side, and disconnect it. Next, remove the positive side. There will be a strap holding the battery in place simply pull it out and set the battery aside.


Now, you will need to connect the battery to the charger. Make sure to use a charger that does not put out more than 10 amps of current. If your charger does not have an automatic shut-off, charge the battery for a minimum of 8 hours.


Once the charging process is complete, unplug the charger from the wall outlet and then remove the negative connector from the battery. Follow this by removing the positive connector.


Now, you can reinstall the battery into the lawn mower. Secure it using the strap, and then reconnect the wires starting with the positive wire and then the negative wire.

If you wanted to watch a youtube video that shows you how to charge a lawn mower battery amps? I have included a video below:

What Volt And Amp Is A Lawn Mower Battery

A lawn mower battery is a lead-acid battery and needs to be charged with a charger that has the correct settings. The recommended setting for charging a lawn mower battery is 10 amps for a 12 volt battery. This will ensure that the battery gets enough power to run the lawn mower.

Along with, It is recommended that you charge a lawn mower battery at 10 amps. This will allow the battery to gain enough power quickly. In some cases, it may only take an hour to charge the battery fully.

Don’t Miss: Best Electric Lawn Mowers Cordless

How To Charge Lawn Mower Battery

If your lawn mower battery is dead, you may be wondering how to charge it. Luckily, its a relatively easy process that only requires a few simple steps.

First, locate the battery on your lawn mower. It should be located near the engine, and will usually have a cover over it. Once youve found the battery, remove the cover and take a look at the terminals.

Next, youll need to connect the charger to the battery. Most chargers will have two leads, one red and one black. The red lead should be connected to the positive terminal, and the black lead should be connected to the negative terminal.

Once the charger is connected, turn it on and let it run until the battery is fully charged. This could take a few hours, so be patient.

Once the battery is fully charged, you can reattach the cover and put the lawn mower back together. Then, you should be good to go!

Step : If The Battery Is Dead Precharge With An Old Charger Or Another Battery

Charge the battery on a riding mower or lawn tractor how to

When the battery is really dead and you do not measure something, most modern chargers will not charge. It is always good to try them first, but most often, they will give an error. This is because the charger only works when the battery has some charge in it. The solution to this is to use an old charger that does not have this kind of circuit. Connect it and charge the battery for several hours.

The other method is to use another battery and use it to charge the dead battery slightly. Connect the charged battery with the jumper cables to the dead battery. Let it charge for a few hours. Then disconnect the jumper cables. Always ensure that the battery you use has the same voltage as the dead battery.

The battery of the lawnmower supplies a specific power. Although the voltage is a constant 12 V for most of the engines, the current value might vary. The choice of charger is based on these values. It is

Also Check: How To Get Rid Of Moss On Lawn

How Do I Know If My Toro Lawn Mower Battery Needs To Be Recharged

Batteries lose their charge when not in use, especially when stored over winter months. They can also lose their charge as the battery gets older. Anytime the mower is not in use for a period of time, it is good practice to charge it before using the mower.

The mower will also not start if the battery needs to be charged.

In addition to these signs, you can also test your battery regularly to determine if it needs to be charged. The better you maintain the mower battery, the longer its life will be.

This multimeter from Amazon can help you do this. The AstroAl digital multimeter is made for commercial use and accurately tests the voltage for heavy-duty batteries. The easy-to-read LED screen lets you see the charge your mower battery has.

If the mower has been sitting for a while, you can quickly test the voltage of the battery with this tool, to check if any additional charge is needed or not. A multimeter also lets you make sure the voltage of the battery is full before you put the mower into storage.

Make sure the mower is off and locate the battery. Wriggle the connection cables to make sure they are securely connected. Sometimes this can be a cause for not starting and you may not need to charge the battery at all.

How Long To Charge A Lawn Mower Battery And How Does It Work

The length of time for a lawnmower battery to be fully charged will depend on the battery charger. If it is a top-quality model that can deliver lots of juice, it will take about four to six hours to charge the battery.

A lawnmower battery works the same way a car battery, wherein the power is carried and consumed through the alternator charging unit. Thus, it requires continuous charging, even after usage.

Don’t Miss: Husqvarna Lawn Mower Parts Online

Faqs About Length Of Time To Charge Lawn Mower Batteries

Since weve covered the basic factors that affect charging times, and also talked about how you can make an estimation of the time your battery will need to charge, lets go through some more examples.

I see a lot of people not only wondering how long it takes to charge a lawn mower battery, but also wondering about the time that their batteries will take to charge at different amperages. So, Ill do my best to explain the timeframes required for each charger type below.

Can You Charge A Lawn Mower Battery With A 12

Why Is My Lawnmower Battery Dying? How To Fix It?

Yes, you can charge a lawn mower battery with a 12-volt charger. There are a few things to keep in mind, though. First, make sure that the charger is rated for the specific type of battery that you have. Second, follow the manufacturers instructions for charging the battery. Third, be sure to disconnect the charger once the battery is fully charged.

Also Check: Patio Furniture Tables And Chairs

How Does One Charge A Lawn Mower Battery With A Car

is a question we get a lot here at the shop. And its a great question! After all, both lawn mowers and cars have batteries, so it makes sense that you could use one to charge the other.

The short answer is: you cant.

While it may seem like a good idea in theory, charging a lawn mower battery with a car battery is actually a really bad idea. Heres why:

1. Lawn mower batteries are designed for low discharge rates.

This means that they cant handle being charged at the high rates that car batteries can. In fact, charging a lawn mower battery with a car battery can damage the battery and shorten its lifespan.

2. Car batteries put out a lot of power.

Lawn mower batteries just cant take that much power. They can overheat and catch fire, which is definitely not something you want to happen.

3. Its not safe.

Charging a lawn mower battery with a car battery is a recipe for disaster. If something goes wrong, you could be putting yourself and others in danger.

So, whats the bottom line?

Charging a lawn mower battery with a car battery is a bad idea. Its not safe, its not effective, and it can damage your battery. If you need to charge your lawn mower battery, use a lawn mower charger.

How Long Does It Take To Charge A Lawn Mower Battery At 40 Amps

Chargers rated for over 20 amps are usually considered to be rapid chargers. If you are using a 40 amp charger to recharge your lawn mower battery, it wont take much time at all. You will likely be able to completely charge your battery in an hour or less .

However, charging your battery as fast as you can isnt recommended. Fast charging can result in serious battery damage or explosion if not closely monitored.

Read Also: Backyard Memorial Memorial Garden Ideas

How Do I Know If My Lawn Mower Battery Is 12

Count the number of plastic caps, if present, and multiply them by two to determine the battery voltage. If youre not sure how many caps you have, you can count them on a piece of paper, or use a multimeter to measure the resistance of the cap. If you dont have multimeters, use an ohmmeter to check the voltage of your battery.

What To Do If Your Mower Won’t Start

How to Charge Your Lawn Tractor’s Battery

If you can’t get the engine to turn over, the first thing you’ll want to do is pick up a battery charger and try charging the battery back up again. When looking for a battery charger, you want to make sure that the charger matches the voltage and chemistry of your battery. We suggest the . This automatic charger is a great choice for off-season storage. You can keep it connected indefinitely, without fear of overcharging your battery.

Also Check: Black And Decker Vacuums Cordless

Lawn Mower Battery Won’t Last That Long

The biggest thing youll see when it starts to wear out is that it doesnt last that long. Old batteries become more resistive internally and have to work harder to achieve the same amount of output.

Batteries also have a certain amount of self-discharge, sometimes called leakage current or parasitic current.

This means that a fully charged battery slowly dies when the charger is turned off. However, the discharge occurs slowly. It may leak only a few percent per month. So if you leave a fully charged battery in the garage during the winter, it wont die if it lasts only 50 minutes during the first cut in the spring. No need for a trickle charger. Simply put the battery back in the charger until it is fully charged for the first cut of the season.

Start The Mowers Engine

Head to the lawn tractor and turn the mowers engine on.

It will come on but if it doesnt, leave the connection intact for a few minutes to allow the mower battery to get some juice before restarting it.

You may not necessarily need to start the cars engine

However, if you must, confirm that your mower is off before starting the car as you risk overloading the mower battery once the car comes on.

Side note: The more flat your battery has become, the longer you could need to wait before retrying.

Read Also: Parts For John Deere Lawn Tractor

Battery And Charger Voltage

When going to charge your battery, it is super important that you use a charger of the same voltage as your battery. Using the wrong voltage charger will make it impossible to charge, or ruin your battery.

A lot of people wonder, can you overcharge your lawn mower battery? The short answer is yes. If, for example, you use a 12-volt charger on a 6-volt battery, it is extremely easy for your battery to overheat and break down. While there are people who may try to rapidly charge a 6-volt battery with a 12-volt charger, it really isnt a good idea.

On the other hand, a 6-volt battery charger used with a 12-volt battery will not produce enough charge for the 12-volt battery to supply power. It doesnt matter how long you leave the charger hooked up in this case because 12-volt batteries are considered totally dead even when they fall down to just 10 volts.

How Do You Trickle Charge A Lawn Mower Battery

How To Charge A Lawn Mower Battery With A Car?

Most battery chargers will deliver a current of up to 10 amps to the battery because it is a combination of a safe and quick way to charge the battery. A trickle charger is a great alternative to regular chargers because it will charge your battery at a very slow pace for a longer time. This protects the battery by:

  • Preventing overcharging
  • Keeping the battery from draining
  • Protecting the battery from temperature and sulfate damage

When a lawn mower battery is overcharged, the battery can get damaged and need to be replaced faster. Some regular chargers will shut off automatically when it has reached a full charge, but for those that do not, you will have to remember to take the charger off the battery.

Even if the charger can shut off on its own, leaving the battery to sit for extended periods of time can still lead to the battery draining. Batteries that are not used for a long time can be damaged by sulfation.

Additionally, if the lawn mower is in a shed or garage over the winter, the cold weather can crack the battery.

Trickle chargers keep the battery constantly constantly charging by delivering a slow and steady charge. This will greatly increase the charging time, but it will protect your lawn mowers battery by keeping it steadily charged and warm, even when it has been put away.

You May Like: 20 Volt Black And Decker Battery