The last thing you want is your lawn mower to power off while you’re giving your yard its regular trim. Knowing the lifespan of your lawn mower’s battery will give you a good idea of its running time, motor efficiency, and reusability.

So, how long does the Ryobi lawn mower battery last?

Ryobi offers many lawn mower options which are popular among gardeners and landscapers. With such a vast variety of options, each lawn mower comes with its own battery life. Though it may be confusing, our article will break down all you need to know about Ryobi lawn mower batteries and their average lifespan.

Now, let’s get into the details.

How Long Should a Lawn Mower Battery Last?

Depending on their battery life, different lawn mowers provide varying durations of performance. This also means that these lawn mowers have different total life spans – which means the count of total years that the batteries last until they have to be replaced.

To properly understand how long a lawn mower battery should last, you first need to know the difference between lithium-ion and lead-acid batteries, and the average performance duration and lifespan of lawn mowers.

Lithium-ion vs Lead Acid Battery

By transferring charges from the positive to the negative electrode, lithium-ion batteries work to charge the battery. As they are just beginning to roll out in modern mower models, they are said to last about 3 - 5 years. This translates to up to 500 full cycles of the battery being discharged and charged again.

On the other hand, lead-acid batteries have been used for powering mowers for decades. Unlike the lithium-ion battery, you cannot use a lead-acid battery to its full capacity. This means you’ll only be able to use about 50% of its total stored energy. Also, they’re good for about 300-500 cycles, depending on the label.

However, the life span of a lithium-ion battery heavily depends on its material. If you want an efficient battery with maximum performance and fast recharge, you’ll have to look for a high-quality battery.

You can easily find a good quality lead-acid battery-powered mower from any garden landscaping store. They’re also relatively cheaper than lithium-ion batteries and are more conveniently rechargeable. Plus, you can also achieve a high-power output capability with this type of battery, leading to more thorough cuts.

Average Performance Duration of Lawn Mower Batteries

With lead-acid batteries, you can use a mower without recharging it for up to 6 months. This is because the battery holds energy for a long time and self-discharges at a rate of minus 4 percent a week. At this rate, you can comfortably mow yards uninterruptedly for weeks on end.

Lithium-ion batteries are said to lose about 2 percent of charge every month, which is a significantly lower discharge rate than lead-acid batteries.

But, this does depend on how much power exertion the motor produces. Experts recommend charging the battery up to 50% every 6 months, even if the mower is occasionally used.

Average Lifespan of Lawn Mower Batteries

The lifespan of a battery can be understood from the total full cycles it is capable of providing. Since lead-acid batteries can give around 300 to 500 full discharge and recharge cycles, it means they will most likely start to deteriorate at around 3-4 years of use.

A telltale sign of a deteriorating lead-acid battery is the reduction of the energy capacity threshold. Most lead-acid batteries aren’t able to use more than 50% of their fully charged storage, but if the threshold itself drops to 80% or lower, you have to replace the battery to avoid any mishaps.

However, a great quality lithium-ion battery is able to produce up to 3000 cycles, given they are handled with care. Most lithium-ion batteries can last up to 5 years or longer. You can replace them around the 3 to 4 years mark.

How Long Does the Ryobi Lawn Mower Battery Last?

Ryobi lawn mower batteries are of varying types, and both lithium-ion and lead-acid batteries are available. Since Ryobi lawn mowers are so common, they’re considered reliable and thus have long-lasting batteries which provide exceptional performance.

There are many variants of Ryobi mowers. Ryobi 40V brushless mower, 18V mower, and 36V mower are just to name a few. Of course, they also come with added options such as 4ah, 5ah, 6ah, 7ah, and more. With each mower, comes a different battery life.

On average, a fully charged Ryobi lawn mower will give you anywhere between 40 to 60 minutes of performance. The most popular Ryobi mowers use lithium-ion batteries, so they are easy to recharge and are fairly long-lasting.

Moreover, the average Ryobi lawn mower battery life span is up to 3 years. This means you can consider getting a replacement around that time or even later, given the battery still works uninterruptedly.

It’s hard to give a straightforward answer for the average Ryobi lawn mower battery charge time. Taking the example of the Ryobi 40v lawn mower battery 4ah, it can take up to 4 hours to fully charge.

Things to Know Before Buying a Battery Lawn Mower

You can't just take out your card and buy any random battery lawn mower out there without prior research. So, we've compiled some of the important factors you should keep in mind before buying one –

Selecting the Right Battery

Based on our experience, Lithium-ion batteries are more durable with a great power density and very low maintenance – unlike other commonly available batteries. You won't have to replace them before 4 to 5 years of usage at max.

You'll also need a lawn mower battery charger that should be able to provide 10 amps of electric current if the mower has a 6-volt battery. Charging a lawn mower battery with more than 10 amps of current will be harmful and reduce the battery lifespan.

Knowing How to Charge Lawn Mower Battery

You need to put on your hand gloves and wear safety glasses first. By the way, you don't need to remove your lawn tractor's battery before charging it, but make sure to unplug the battery charger if it's connected to any electrical outlet.

Next, you'll notice two battery terminals of two different colors - red and black. The red one is positive while the black one is negative.

So, take the positive charging cable, which is the red one, and connect it to the red terminal of your battery. Then pick up the negative charging cable and connect it to the battery's negative terminal which is colored black.

Once you're done, plug in the charger to an electric source. The charging up may be completed within an hour if it's a recent model.

Deduce Your Lawn Size Beforehand

You should estimate your lawn size in acres before buying a lawn mower. You can also multiply the length and width of your lawn to find out the total area. This is to help you decide what lawn mower size you should opt for.

A typical lawn mower with a deck width between 50 to 54 inches can conveniently mow a lawn of 4.5 to 5 acres.

Choosing the Right Drive System

If you have a relatively small yard, measuring like ¼th of an acre, you can go for a push lawn mower - it's cost-efficient, lightweight, as well as easy to control.

For bigger-sized lawns in hilly areas, you can go for a sturdier drive system, such as a self-propelled battery-powered lawn mower. With proper maintenance, these mowers can last up to 8-10 years.

Get a Bumper

If you have plants, bushes, and trees in your yard, you are likely to bump into them quite often while mowing grass. Hitting hard surfaces will damage the hood of your lawn mower, and the only option you'll have left is to repair the machine.

That's why to be on the safe side, you should buy a lawn mower with aluminum bumpers in the front to protect the hood from damage, especially if you have trees in your garden. Otherwise, it's not a necessary feature to look for.

Ways to Fix Dead Ryobi Battery

Like all batteries, Ryobi batteries also have a limited life span. But, a “dead” battery might not be completely inactive. In fact, there are many ways to revive one. Here are some ways you can fix a dead Ryobi battery –

Plug and Pull Charger

Sometimes, lithium-ion batteries can go into sleep mode automatically. This happens when the battery is completely drained and practically none of the energy is left for the battery to discharge itself. This is commonly mistaken as a dead battery.

A way to solve this is by plugging in the charger, counting to 3, taking the charger out, and repeating this for 30 minutes. The first few seconds a hibernating battery is connected to a power source will bring up its charge, so you will have to repeat this to bring it to the mower’s minimum threshold.

DC Power Source

Another way to revive the battery is by connecting it to a DC power source or another Ryobi lawn mower battery. Connect the contacts in pairs, meaning the positive with positive and the negative with negative. Let it charge for 10 minutes so that the battery reaches the minimum threshold.

Multimeter Test

The voltage is a giveaway for the main issue of the battery. In this case, take a multimeter and test out the charger, it should indicate a voltage of 18V or higher. Then test the battery. It should show at least 7V to indicate a possibility of the battery reviving. Try the plug-and-pull method and bring it to this level.

Repair or Replacement

Check the temperature of the battery. As most Ryobi batteries are lithium-ion, they should be at 41 degrees Fahrenheit and 113 degrees Fahrenheit to charge properly. If it’s above or below this range, get it to room temperature by placing it in cool/warm parts of your home for a while. Then try charging it normally.

Clean the battery well. Dirty or rusted contacts may be the reason why the battery’s dead. So, gather a few alcohol wipes, sandpaper, and a wire brush and gently clean the contacts.

If all else fails, the best thing to do is take the battery to a store or contact a Ryobi distributor. Not every DIY hack is helpful, and it’s completely fine to ask for help. The experts have resources that we’re not accessible to, so they can be of great assistance and hopefully get your mower’s battery working again.

Frequently Asked Questions

a. How long do Ryobi 40V batteries last?

The Ryobi 40V brushless mower has batteries that can carry a charge for up to 40 minutes or more, depending on the unevenness of the yard you’re working on.

b. How long does a Ryobi 18V lawn mower battery last?

The Ryobi 18V lawn mower carries a lithium-ion battery that can hold a charge for up to 40 minutes.

c. How many years does a Ryobi 40V battery last?

A typical Ryobi 40V lithium-ion battery can last up to 3 years. Its life span is defined in terms of total charge cycles. For example, a Ryobi lithium-ion 20V battery is able to provide 2000 charge cycles.

d. How long does a Ryobi 40V 6Ah battery last?

A 6ah 40V can last only about 1.25-1.50 hours. Then, a second battery needs to be installed.

e. How long does a Ryobi 40V 5Ah battery last?

Ryobi 40V 5Ah battery lasts for about 40 mins or more before it needs to be recharged. It has a lifespan of 2-3 years determined by the charging and discharging cycles.

f. How many hours does a 40V Ryobi battery will need to charge?

For a 4Ah 40V battery that is fully out of charge, it takes less than an hour to fully charge the battery using a good-quality charger. With a regular charger, it takes about 3 hours to fully charge the battery.

g. How long does it take for a Ryobi lawn mower battery to charge?

Different Ryobi mowers have varying charge times. The most popular model, the Ryobi 40V 4-amp, takes up to 4 hours to completely recharge.


To summarize, all Ryobi lawn mowers possess long-lasting batteries that charge quickly and hold the power for long periods. The average Ryobi lawn mower has a battery that can last between 40-60 minutes and starts to wear down at around 3 years.

Hope you got a clear picture regarding how long does the Ryobi lawn mower battery last.

However, this depends on how you take care of the battery. Always make sure to keep the battery at room temperature, charge it regularly, and never leave it inactive for too long. Keep these factors in check, and you’ll be able to make the most out of your Ryobi lawn mower.