How Many Volts is a Lawn Mower Battery? (All You Need to Know)

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The battery voltage of lawnmowers varies slightly based on the model and production year of the machine. So, there is no one answer to the question, “How many volts does a lawn mower battery have?”

How much voltage a lawn mower battery needs depends greatly on the type of mower you use. Gas-powered riding lawnmowers usually need 12 volts from their batteries, but some older mowers may only need 6 volts. On the other hand, most electric mowers use lithium-ion batteries with voltages between 36 and 120 volts.

Usually, a lawnmower battery does one of two things: it starts a gas engine or powers an electric motor. No matter what is going on, let’s look at the lawnmower battery and its voltage in detail.

How Do Lawn Mower Batteries Work?

How Do Lawn Mower Batteries Work

Starter mowers and ignition systems use the power from the lawn mower batteries to turn on the starter and get the engine running. A lawn mower battery is a small lead-acid battery found at hardware and auto parts stores.

Lawn Mower Battery Electrochemical Processes

A lawnmower is powered by a group of battery cells working together. Each cell has a positive lead oxide electrode and a negative lead electrode.

These electrodes are put in an acid-containing electrolyte solution.

A chemical reaction causes the 2.1-volt difference between the two electrodes in each battery cell.

6-Volt Lawn Mower Batteries

6-Volt Lawn Mower Batteries

A lawnmower battery comprises three separate battery cells that are all wired together in a series to make 6 volts. The DC voltage that these batteries give off is 6.3 volts. If a lawnmower battery isn’t marked with its voltage, you can find out what it is by counting the number of cell vent caps on top. Since this battery has three cells, it has three vent caps.

12-Volt Lawn Mower Batteries

A lawnmower’s six battery cells are connected in series to make a 12-volt system. The DC voltage that these batteries give off is 12.6 volts. You can tell a 12-volt battery by the six vent caps on the top of the battery box. Lawnmowers that use electric starters no longer use 6-volt batteries. Instead, they use these batteries.

Also Read:- How To Restore a Lawn Mower Battery? {A Complete Guide!}

How to Determine the Voltage of a Lawn Mower Battery

There are several ways to figure out the voltage of a lawnmower battery. In some cases, the voltage of your battery is on the side, but in other cases, you may have to dig around to find it.

Here are a few of the easiest ways to determine how much voltage is in your lawnmower’s battery.

Examine the Battery

The fastest and most direct way to answer the question “How many volts is a lawn mower battery?” is to look at the battery itself. Every battery I’ve ever seen had a big label with a lot of information on it on one side.

“12v7Ah” or something similar may be written on some lines of text. That is the same as a 7-amp-hour, 12-volt battery. It doesn’t matter; look at the number before the “V” to find the volts.

Most companies that make lithium-ion battery-powered lawnmowers will be happy to tell you how much voltage their product has. The only thing to watch out for is that some cordless electric push mowers connect two batteries to get a higher voltage overall. So remember that when you look at your lithium-ion batteries.

Reference User’s Guide

The owner’s manual for your car is another good way to determine how much voltage your battery has. You should be able to find out what kind of battery your lawnmower needs by going to the electrical or battery section. Lawnmowers with both lead-acid and lithium-ion batteries can use this.

Determine the Mower’s Serial Number

It may be on the deck if you have lost your owner’s manual and don’t know your mower’s model or serial number. This kind of number is usually found on a label that has been securely stuck to the deck. This label is sometimes attached to the top of the deck right behind the engine, but it is more common to see it on the side of the deck, at the front, or the back of the mower.

Once you have the serial number, you can use it to find the manufacturer’s website or an online user manual.

Count the Battery Cells

If you have a lead-acid battery but can’t find any information about it or your lawnmower, it’s a good idea to count the number of cells in it. Most lead-acid batteries have little caps on top made of plastic, making it easier to tell which partition is which. At this point, the acid and electrolyte mix is poured into the battery.

Look at your battery and count the cells to find how many it has. Each lead-acid battery cell will make about 2.2 volts of electricity. Just count the cells and multiply by 2 to get the voltage. For example, batteries with a voltage of 12 volts have six cells, while batteries with a voltage of 6 volts only have 3.

Use a Voltmeter

As a last resort, a voltmeter can be used. You can buy a voltmeter at a store that sells parts for cars. The jumper cables should be used to connect the positive (+) and negative (-) leads of a voltmeter to the battery terminals.

How to Check the Battery in a Lawn Mower

Sometimes, the lawn mower just won’t start. This could be because of several small or big problems. Most of the reasons are easy for the homeowner to fix. Batteries often lose their power and can’t hold a charge. With the right tools, you can quickly figure out what’s wrong and fix it.

Find Out How the Lawnmower Gets its Power

Check the trunk or the engine compartment. Both types are commonly seen on riding mowers, but a push mower has its battery in front of the motor. For specific battery location information for your vehicle, go to your owner’s handbook.

Clean The Cells Before Testing

Get rid of the dirt and grime using the towel.

Remove any grime or corrosion from the battery’s top with the flathead screwdriver. A stronger connection between the multimeter and the battery may be established in this way.

Check the Type of Battery

Locate the manufacturer’s logo or brand nameplate. You may put it on top or to the side. Locate the battery’s required voltage. Some lawnmower batteries are 12 volts, although 6 volts is more common. There should be a voltage designation either next to the brand name or below it.

Make Sure the Voltage is Set Right on the Charger

The batteries are checked using a multimeter with two voltage settings (6V and 12V). Please make the necessary adjustments to the multimeter so it reads the same voltage as the battery in your lawnmower. The AC and DC settings should be on most multimeters. Using the DC setting, typically 200 volts, is recommended while testing a lawnmower.

Set the Wires up

To disconnect the battery wires, use the pliers. Make sure the battery posts are clean and free of corrosion. Use the tip of the flathead screwdriver to scrape the threads clean of corrosion. To use, attach the red wire to the “+” terminal and the black cable to the “-” terminal (the positive and negative terminals, respectively).

Check the Multimeter

Inspecting the lawnmower’s wiring and fuses ensures the voltage is correct. Proceed to the following step if the voltage of the lawnmower is within the acceptable range.

Check the Level of the Water

Battery removal requires prying up the top of the case using a flathead screwdriver. Examine the battery for water accumulation on the top metal plates. If the water level is too low, fill it with distilled water until it is. Put on new caps on the bottles. The voltage should be rechecked when the battery has been replaced in the multimeter. Proceed to the following step if the battery still won’t charge.

Check for a Fuse Near the Battery

Replace the blown fuse with a new one. If a lawnmower doesn’t turn on, a blown fuse may be the fault.


Will a battery-powered mower be useful to me?

It’s possible, but it’s not clear. But you can’t argue against the benefits of a mower that runs on batteries. It’s cheap, easy to use, and better for the environment than gas-powered motors because it can replace them (since petrol – the main power source – is costly at the moment).

Can a lawnmower battery get fixed?

Indeed, you can do that. If you don’t fully understand the lawn equipment and the safety tips, you could hurt the lawnmower batteries and yourself (lead-acid batteries have sulfuric acid in them!). For beginners, it’s better to pay more to have it fixed because that stops any more problems.

Are Lawn Mower Batteries Safe to Overcharge?

A lawn mower’s battery can run out of power if used too much. When a battery is overcharged, the electrolyte can boil. This makes the battery useless. It’s important to charge the battery according to the manufacturer’s instructions and with the right charger for the type of battery. Your lawnmower will last longer because the battery will continue to work at its best.

Do lawnmower batteries come in 6v or 12v?

On the other hand, some smaller riding lawnmowers only need a 6-volt battery. If you don’t know what kind of battery to buy for your mower, check the voltage of the old battery, read the owner’s manual, or go to the manufacturer’s website.

Can you start a lawnmower while the battery is charging?

It is possible to start the lawnmower’s engine while the battery is being charged. But before you can mow, you’ll need to connect the positive end of the jumper cord to the positive terminal on the lawnmower.

Also Read:- How Long Does a Lawn Mower Battery Last? A Complete Guide!


Lawn mower batteries come in many different voltages, so it’s important to know your machine’s needs before buying a new one. It affects how long your battery will last and how well it will work when the temperature is high.

When buying a new battery for your lawnmower, you should consider the voltage if you want its best performance. This is a great thing to do to prepare your mower for the summer.

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