40V 21" Brushless Self-Propelled Lawn Mower w/ 5.0 Ah Battery and Charger

In stock
Model
2516402
21-Inch Self Propelled Mower is rated 4.3 out of 5 by 159.
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Mow the toughest yards with 2x more torque!

  • Deck Size: 21”
  • What's Included: One (1) 40V Battery (5.0 Ah) plus Charger
  • Runtime: Up to 50m.
  • Charge Time: 40m per 40V Battery (5.0 Ah battery)
  • Acreage: Up to 1/3 Acre
  • Power 60+ Tools with any Greenworks 40V Battery
Special Price $359.99 Regular Price $449.99

SAVE 20% ($90.00)!

In stock
 
2x more torque takes the work out of yard work
Powerfully smart. Tackle the toughest yards, one-handed—because our smart mowers never bog down. When grass gets thick, tall, or wet, Greenworks sensors tell our TRUBRUSHLESSTM motor to rush power to the mower blades. The end result? The perfect lawn, every time.

Powerfully tough. The deck is forged with heavy-duty steel, ready to tackle any terrain. Add in algorithms and a brushless motor to reach unrivaled blade speed. Ka-pow!

Powerfully easy. Simple to start with just the push of a button. Effortless to mow because it’s self-propelled, no sweat! Gentle on the ears because it mows quietly. A cinch to store in small spaces—you can even hang it up if you want to.

Additional features include a The convenient 3-in-1 cutting deck lets you choose your cut finish from mulching, bagging or side discharge

Zero gas smell. Zero pull cords. Zero maintenance. Zero pollution breathed. Zero time wasted.

Key features
21" Deck Size - Durable steel that plows through the tallest grass
Push Button Start - Press and mow, no more cord yanking
Intelligent TRUBRUSHLESSTM Motor Technology - 2x more torque, more power, longer runtimes, quiet operation, and extended motor life
Innovative SmartCut™ Technology - Senses grass and auto-adapts power for the perfect cut
3-in-1 Design - For easy mulching, bagging, or side discharge
Battery Powers 60+ 40V Products - One battery to mow, blow, cut, trim, cultivate, and more!
The No List
No Gas Smell. You no longer have to smell like gas after mowing
No Emissions. Save money and breathe clean air
No Maintenance. No tune-ups, no mixing fuels, no messy spills
Low Noise. Easy on the ear, low decibel mowing
Warranty + Service
3 year tool limited warranty
3 year battery warranty
Dedicated Support 1-888-909-6757
Power 60+ Tools with any Greenworks 40V Battery
Power:
Cordless
Voltage:
40V
Ideal For:
Up to ⅓ Acre
Drive System:
Rear-wheel-drive Self-propelled
Brushless Motor:
Yes
Deck Size:
21 Inches
Discharge Features:
3-in-1
Deck Material:
Steel
Cutting Heights:
7 Position
Max Cutting Height:
3-¾ Inch
Min Cutting Height:
1-⅜ Inch
Front Wheels:
8 Inches
Rear Wheels:
10 Inches
Tool Warranty:
3 Years
Battery Warranty:
3 Years
Battery Capacity:
5.0 Ah
  • (1) 40V 21" Self-Propelled Brushless Cordless Lawn Mower
  • (1) Grass Collection Bag
  • (1) 5.0 Ah Battery
  • (1) Battery Charger
  • (1) Owner's Manual

WALK BEHIND MOWERS FAQ

What maintenance is required for my Greenworks mower?

Greenworks mower units require much less maintenance than a traditional gas unit. However, It will still require routine seasonal maintenance. After each use, we advise you empty the bag (if bagging has been used), then check/clean off debris on the side discharge and rear slot, clean the underside of the deck with a cloth, and wipe the unit down. If there is harder debris stuck to the underside, you may want to use a rubber deck scraper. Make sure to check the unit for loose nuts and bolts after use and secure them if needed. Do not expose this unit to water. Check the blade for any damage/dullness and replace or sharpen as needed. Store the unit in a cool, covered, and dry location such as garage or shed. If you have a battery-operated tool, batteries and chargers should be stored indoors. Please refer to your manual for more guidance on mower/battery maintenance and storage.


When should I cut my grass?

Here are some mowing tips that may be helpful: • Mow when grass is dry. • Mow no more than 1/3 of the length of grass at a time. • Mow in the morning or late afternoon to reduce the heat stress on the newly cut grass. • Alternate mowing patterns each time you mow. As grass develops a grain based on your cutting direction it will lean towards the direction of your mowing path. Changing the pattern allows better vertical growth and helps to keep the cut neater. • Consider mulching. To mulch, remove the bag and insert the mulch plug into the rear of the unit. This will leave the clippings on the lawn allowing the nutrients and nitrogen contained within them to return to the soil and allow the remaining grass to recycle them (always discharge the mulch towards a previously cut area to prevent your mower from bogging down). • Leave grass a little higher in shaded areas. This keeps them healthy in relatively nutrient poor conditions. • Always keep in mind what conditions your variety of grass prefers. If your grass prefers cooler climates, reduce the frequency with which you mow and increase the cutting height of your mower during hot seasons to compensate for the reduced growth rate these varieties may experience in this type of weather.


Do I always need to use my self-propelled feature when operating a self-propelled mower?

No, you don't have to engage the self-propelled feature to operate a self-propelled unit as there are two separate motors. Familiarize yourself with the self-propelled feature and the cutting feature of your unit (instructions are inside the manual). Once you understand these two features, you can engage the blade without using the self-propelled feature.


Can my Greenworks mower cut up pine cones, branches, twigs and other yard debris laying on my lawn?

Greenworks mowers are designed for grass, weeds and foliage. It's not advisable to depend on the mower to mulch any other types of debris. Before operation, please thoroughly inspect the area where the mower is to be used. Remove all stones, sticks, wire, toys, and other objects that could be tripped over or thrown by the blade. Thrown objects can cause serious personal injury.


Can I use my mower in wet conditions such as rain?

For safety reasons (which can be found inside your owner's manual under safety information), we advise not using the mower in wet conditions as unstable footing could cause operators to slip, causing a potential hazard. *The 60V X-RANGE line which features IPX4 weather-resistant construction can be safely used in damp conditions. Be mindful of your footing during use in potentially slippery conditions.*


What does SmartCut™ mean?

The SmartCut™ feature is designed to maximize run time and battery life by automatically detecting the length of grass and adjusting its power or throttle for the optimal cut. With this feature, the rotational speed of the blades will vary. For example, the blades will automatically spin faster when you hit thicker grass.


Does my Greenworks mower unit require gas or oil?

No! Gas and oil are not required to operate our units. Greenworks mowers emit zero emissions and are either battery operated or corded.


Is the battery from my Greenworks mower interchangeable with the other units?

Each voltage line has its own set of interchangeable tools and batteries but are not interchangeable across different voltage lines. For example, 24V batteries are only interchangeable with 24V tools, 40V batteries are only interchangeable with 40V tools, etc. To see compatible tools within each voltage line, select shop by voltage on the Greenworks site or follow the link: https://www.greenworkstools.com/shop-by-voltage If you’re still unsure if your unit is compatible, please contact us at info@greenworkstools.com for further assistance. We’re happy to help!


How do I start my mower unit?

Make sure you are starting the unit in the following order, or it will not start: 1. Push down and hold the safety switch button. While pressing the safety switch button with one hand, use your other hand to simultaneously pull the bale switch towards you. 2. Once the machine turns on, you can let go of the safety button and continue to hold the bale (lever) handle. The unit will only start when the safety button is pressed first, followed by the bale switch. If it is reversed, the unit will not power on. For some of our EZ Fold™ units the start sequence will not affect the unit. Use the correct batteries according to the unit and ensure the batteries have adequate charge. You can either push the button first or pull up the handle—these models are not affected by the start order. For corded units, ensure you have the correct extension cord (reference the owner’s manual) and power from your outlet. If you’re using a battery unit, ensure the battery has a full/adequate charge. However, please always refer to your owner’s manual for verification on the starting process as this would be the most accurate source of information.


Can I use a different Greenworks Amp hour (Ah) battery in my unit?

Yes! For most of our current units, as long as the batteries are from the same Greenworks voltage line (24V batteries with 24V tools, 40V batteries with a 40V tools, etc.), the amp hours (Ah) are interchangeable. Please refer to the below link for our voltage line: https://www.greenworkstools.com/shop-by-voltage If you are unsure if your battery is part of a voltage line that can be interchanged, please contact us at info@greenworkstools.com for further assistance. *Exceptions for our Greenworks 60v 8.0Ah and certain chainsaws in the 80v line.*


What does brushless mean?

A brushless unit has a brushless motor. While conventional motors have carbon brushes which tend to wear over time, brushless motors use magnents instead. This allows the motor to have a longer life, produce less heat, provide more torque, and use less battery. Basically, a brushless motor is a more powerful and efficient upgrade to the traditional brushed motor.


Does battery temperature matter?

Yes! The temperature of the battery should not be too warm or too cold. If the battery is too cold or too warm it may not be operatable—that's why it's important to let your battery reach room temperature prior to use. To avoid battery temperature issues, batteries should be stored indoors in a dry and cool location. More information on battery storage and temperature can be found in inside your owner’s manual.


Why isn’t my mower turning on?

Corded mowers: Make sure you are using the correct size extension cord by following the guide inside the owner’s manual. Check that the extension cord is not loose when inserted into the mower’s plug and ensure a secure connection to a live 120V AC, 60 HZ AC receptacle. Battery operated mowers: Check to ensure the battery capacity has an adequate or full charge, then secure the battery into place. If the battery is loose or can easily be removed, it doesn't have a complete and secure connection. Follow the starting guide located in your owner’s manual for further instruction.


Why does my mower cut grassy unevenly?

Your yard may be too rough or uneven. For a better cut, try moving the cutting height to a higher position when mowing on uneven surfaces.


Why isn’t my mulching working?

First, make sure the mulching plug is inserted into the rear slot at the back of the unit. Next, remove the bag. If too many grass clippings are sticking to the underside of the deck when mowing, the grass is too wet. Wait until the grass dries before mowing again. Also, it's important to keep the underside of the deck clean and clear of debris so that the blade can efficiently cut and mulch.


How do I stop my mower from vibrating?

Slight vibration is normal. However, if you notice an increase or difference in the vibration of the unit during use there may be an issue with the blade or motor shaft. If it’s an issue with the blade, simply replace the worn blade. However, if the motor shaft is damaged or bent you'll need to bring it into a service center. Please contact us at 1-888-909-6757 for further assistance.


Why is my mower hard to push?

Here are some reasons why your unit may be hard to push: • The cutting height is set too low for how tall the grass is—move the cutting height up. • The rear bag is full and is dragging on the ground. Empty the grass bag so it doesn't drag and add weight as you’re mowing. • The underside of the deck is caked with debris. Clean and clear it so the blade can work more effectively. General mower care for best results: • Prior to storage, clean and examine the machine for any damages. • Store the unit in a dry, covered, and cool location like a garage or shed. • Ensure that the unit is stored in a secure location that is not accessible to children or any other persons who should not be operating such machinery.


Can I use my Greenworks mower on hills and slopes?

Yes, though walk behind mower units should not be operated on slopes greater than 15 degrees. This is not a limitation of the unit, but rather to ensure safe footing for the user. When mowing on a hill remember to mow across rather than up and down.

Rated 5 out of 5 by from Lawnmower It works great. Cuts well. Very quiet and you can either push it or let it do the work.
Date published: 2022-06-22
Rated 5 out of 5 by from Well thought out, high quality, verticle storage. A very well-thought-out mower. Nice, high-quality construction with good use of metal parts and super convenient, space-saving verticle storage.
Date published: 2022-06-18
Rated 5 out of 5 by from Easy peazey breezy This is a great lawmnmower. First, its so quiet. Secondly, so easy to start. Third, the self-propulsion makes cutting the grass a breeze - I spend so much less time mowing. Last, all my neighbors are jealous that I have a battery lawnmower that they are going to get one too. It makes one of the worst chores of summer not so onerous; I no longer dread going out to mow the yard. Simple to assemble and easy to use, I highly recommend this mower to anyone who gets tired mowing their yard.
Date published: 2022-06-13
Rated 5 out of 5 by from Lawn Mower This thing is easy to use, has good power, and the best part, no carburetor!
Date published: 2022-05-03
Rated 5 out of 5 by from In love with Greenworks Love love love this mower, We recently moved to community living in TX from PA where I was born and lived the first 77 years. I was very concerned as the HOA is very strict in our community. I am so happy with the lack of noise the mower makes and the power it has there are no fumes from gas or exhaust. When finished mowing our 1/3 to 1/2 acre lawn It stands against the wall in our garage.
Date published: 2022-05-02
Rated 5 out of 5 by from Mowing Is a Pleasure The Greenworks self-propelled mower makes mowing my very bumpy lawn soooo much easier. It took me a few passes to get the hang if it, but quickly became intuitive. The mower starts up easily every time. The batter is easy to take in and out as needed. One charge almost does a 1/4 acre depending on how much I use the self-propell feature. The only cons were the picture directions were hard to understand. But if someone is already familiar with lawnmowers then getting it set up and going should be a breeze. I'm glad I bought it. I already showed my neighbor and now we both have this mower.
Date published: 2022-04-30
Rated 5 out of 5 by from Eco friendly power Super easy to use. Love that it is battery powered and the battery lasts through almost my entire orchard before needing to be recharged and by then I’m thirsty anyway.
Date published: 2022-04-29
Rated 5 out of 5 by from Awesome Machine!! This mower is the bomb! I really love it! As I've gotten older the old gas mower just wasn't an option. I tried a corded electric from another brand for a few years but had no idea how bothersome the cord would be. Quality of the Greenworks machine is far superior to the other brand! Also love the self-propelled feature and it is quite fast! The hare setting is not for old ladies!!
Date published: 2022-04-14
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Rated 5 out of 5 by from Lawnmower It works great. Cuts well. Very quiet and you can either push it or let it do the work.
Date published: 2022-06-22
Rated 5 out of 5 by from Well thought out, high quality, verticle storage. A very well-thought-out mower. Nice, high-quality construction with good use of metal parts and super convenient, space-saving verticle storage.
Date published: 2022-06-18
Rated 5 out of 5 by from Easy peazey breezy This is a great lawmnmower. First, its so quiet. Secondly, so easy to start. Third, the self-propulsion makes cutting the grass a breeze - I spend so much less time mowing. Last, all my neighbors are jealous that I have a battery lawnmower that they are going to get one too. It makes one of the worst chores of summer not so onerous; I no longer dread going out to mow the yard. Simple to assemble and easy to use, I highly recommend this mower to anyone who gets tired mowing their yard.
Date published: 2022-06-13
Rated 5 out of 5 by from Lawn Mower This thing is easy to use, has good power, and the best part, no carburetor!
Date published: 2022-05-03
Rated 5 out of 5 by from In love with Greenworks Love love love this mower, We recently moved to community living in TX from PA where I was born and lived the first 77 years. I was very concerned as the HOA is very strict in our community. I am so happy with the lack of noise the mower makes and the power it has there are no fumes from gas or exhaust. When finished mowing our 1/3 to 1/2 acre lawn It stands against the wall in our garage.
Date published: 2022-05-02
Rated 5 out of 5 by from Mowing Is a Pleasure The Greenworks self-propelled mower makes mowing my very bumpy lawn soooo much easier. It took me a few passes to get the hang if it, but quickly became intuitive. The mower starts up easily every time. The batter is easy to take in and out as needed. One charge almost does a 1/4 acre depending on how much I use the self-propell feature. The only cons were the picture directions were hard to understand. But if someone is already familiar with lawnmowers then getting it set up and going should be a breeze. I'm glad I bought it. I already showed my neighbor and now we both have this mower.
Date published: 2022-04-30
Rated 5 out of 5 by from Eco friendly power Super easy to use. Love that it is battery powered and the battery lasts through almost my entire orchard before needing to be recharged and by then I’m thirsty anyway.
Date published: 2022-04-29
Rated 5 out of 5 by from Awesome Machine!! This mower is the bomb! I really love it! As I've gotten older the old gas mower just wasn't an option. I tried a corded electric from another brand for a few years but had no idea how bothersome the cord would be. Quality of the Greenworks machine is far superior to the other brand! Also love the self-propelled feature and it is quite fast! The hare setting is not for old ladies!!
Date published: 2022-04-14
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does it come with bag for rear bagging?

Asked by: fritzDo
Hello fritzDo, Unit includes a collection bag. Here's what's included with the kit: (1) 40V 21" Self-Propelled Brushless Cordless Lawn Mower (1) Grass Collection Bag (1) 5.0 Ah Battery (1) Battery Charger (1) Owner's Manual
Answered by: Greenworks Customer Care
Date published: 2022-06-27

What is the weight of the mower 

Asked by: Joeee
Hello Joeee, The weight of the unit without the battery is 64 lbs.
Answered by: Greenworks Customer Care
Date published: 2022-06-24

can you lock in the self propelled

Asked by: labradorgirl
Hello labradorgirl, For safety reasons, the bail levers cannot be locked in place.
Answered by: Greenworks Support
Date published: 2022-06-16

I have this lawnmower and I wanted to know if I put the Greenworks 60V battery in this lawnmower will it still work ?

Asked by: MrLyles74
Hello MrLyles74, Unfortunately, you cannot. This 40V lawn mower is for use with Greenworks 40V battery models only. Here is our 40V link: https://www.greenworkstools.com/shop-by-voltage/40v?cat=64 Please note, the higher the ampere-hour (Ah) ratting is on a battery, the more run time it has to offer. For a lawnmower, we recommend using a 4.0Ah battery or higher.
Answered by: Greenworks Customer Care
Date published: 2022-06-01

for cripe sakes, i have been on hold for over an hour....anyone have email address...i need replacement or better yet a more powerful battery form 40 volt, 5 AH POOR CUSTOMER SERVICE

Asked by: ANNE80
Hello ANNE80, We sincerely apologize for the existing wait times that you have experienced. We’re experiencing a higher volume of inquiries at this time and are working our hardest to make sure every customer receives quick support. We kindly ask that you contact us at 1-888-909-6757 (1-888-90WORKS) so that we can appropriately troubleshoot this issue with you.
Answered by: Greenworks Support
Date published: 2022-05-24

We just go our mower. Our battery was fully charged yesterday and we unplugged it. We mowed for the first time today. We read that this had a run time of 50 mins on a full battery. battery ran out at 25 mins. Should the battery be continuously plugged in?

Asked by: Mishu
Hello Mishu, This unit is capable of running up to 50 minutes with the supplied battery but the actual run time depends on the load and operator technique. The maximum advertised run time is based on no load. It is important to recognize that the run time depends on the load acting against the unit and fluctuates depending on the height setting, the terrain, grass height, type of grass, whether you are mulching, operator technique, etc. - there are so many factors to consider. The harder the unit has to work, the quicker the battery charge will drain. Similar to how the gas in a vehicle will deplete quicker when driving at higher speeds or carrying more weight. Here are a few tips to extend your run time: 1) Mow only when the grass is dry. As this is an electric unit, mowing wet/damp grass is a safety issue. However, ensuring the grass is dry will also help the grass cut cleanly and discharge appropriately. Wet/damp grass carries more weight and will mostly stick to the blade, clump up, and will not appropriately discharge. 2) Only trim one-third of the total grass length at a time! This is an important rule to achieve a well-manicured and healthy lawn. 3) Store the battery indoors at room temperature; try to mow in cooler weather. We hope this helps!
Answered by: Greenworks Support
Date published: 2022-05-24

I'm sure the tools required are listed in the manual, but, I am not home to read it and my son is coming from out of town to assemble it for me. Can you tell me what tools are required to assemble the 40v, 21" mower? Thank you

Asked by: sherbowm
Hello sherbowm, No tools are required to assemble this unit!
Answered by: Greenworks Support
Date published: 2022-05-18

Does this mower accept gmax 40volt batteries

Asked by: Mitzilplik
Hello Mitzilplik, Yes, if the batteries are the same voltage, they can be crossed between tool and charger. Each product line has designated charger models that can charge all batteries in that voltage platform, despite Ah rating.
Answered by: Greenworks Customer Care
Date published: 2022-05-13
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40V 21" Brushless Self-Propelled Lawn Mower w/ 5.0 Ah Battery and Charger
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