40V 20" Cordless Lawn Mower w/ 4.0 Ah & 2.0 Ah Battery

In stock
Model
25302
20-Inch Cordless Twin Force Lawn Mower is rated 4.3 out of 5 by 133.
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Mow the toughest yards with ease!

  • Deck Size: 20”
  • What's Included: One (1) 4.0Ah Battery and One (1) 2.0Ah Battery and Charger
  • Runtime: Up to 50 minutes of runtime with (1) 2.0Ah and (1) 4.0Ah batteries
  • Acreage: Up to 1/3 Acre
  • Power 60+ Tools with any Greenworks 40V Battery
Special Price $339.99 Regular Price $399.99

SAVE 15% ($60.00)!

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.

Powerfully tough. The deck is forged with heavy-duty steel, ready to tackle any terrain.

Powerfully easy. Simple to start with just the push of a button. 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 2-in-1 feature provides mulching & rear bagging capabilities

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

Key features
20" cutting deck with Innovative Smart Cut™ technology automatically increases the speed of the blade when more power is needed
Push Button Start - Press and mow, no more cord yanking
Single lever 5-position height adjustment offers cutting height range from 1-1/4" to 3-3/8" for the best cut in all environments
Compatible with Greenworks G-MAX 40V Li-Ion system for higher efficiency and longer run time with an assortment of tools to complete your yard work
Twin Force dual blades offer better cut quality & superior mulching and bagging capabilities
Automatic battery switchover pulls power from the second battery once the first is depleted to eliminate downtime
Hard top rear bag indicates when the bag is full and needs to be emptied
Easy Fold system for storage or compact transportation
10" rear wheels and 7" front wheels make it easy to maneuver through any range of terrain
Includes one 4.0 Ah battery, one 2.0 Ah battery and charger
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:
Push
Brushless Motor:
No
SmartCut™ Technology:
Yes
Deck Size:
20 Inches
Discharge Features:
2-in-1
Deck Material:
Hardened Plastic
Cutting Heights:
5 Position
Max Cutting Height:
3-⅜ Inch
Min Cutting Height:
1-¾ Inch
Front Wheels:
7 Inches
Rear Wheels:
10 Inches
Tool Warranty:
3 Years
Battery Warranty:
3 Years
Battery Capacity:
4.0 Ah
Battery Capacity (2nd):
2.0 Ah
  • (1) 40V 20" Cordless Lawn Mower
  • (1) Grass Collection Bag
  • (1) 4.0 Ah Battery
  • (1) 2.0 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 4 years on, still a great mower I got this mower on a whim as my 4 year old Craftsman gas mower was aging very poorly, requiring much more effort to start than when I bought it (it was well cared for, but oh, how the mighty have fallen). I was a bit concerned about its ability to cut heavier greass and the smaller 20" width making lawn cutting more time consuming, but those concerns were for naught. This very light-wieght mower cuts as well as any previous mower I've owned and it's MUCH easier to push compared to those old steel gas-guzzlers. No annual maintenance (other than hosing off), very low noise, no hands smelling of gasoline, battery capacity has remained excellent. HIGHLY RECOMMEND!
Date published: 2022-06-23
Rated 5 out of 5 by from Mower and batteries Bought this about a month or so ago and LOVE it!!! Nice and clean cuts…love the fact it is a push button start and with gas prices being so high I don’t have to worry about it.
Date published: 2022-06-20
Rated 5 out of 5 by from cuts very well very good mower. the batteries run out as I finish the yard.
Date published: 2022-06-05
Rated 5 out of 5 by from Well designed and works great From the handles to the vertical stove this is a well designed machine. I LOVE this thing and can't wait each week to mow?
Date published: 2022-05-28
Rated 5 out of 5 by from The Best Mower I’ve Owned! This is my 2nd and still preferred brand. Green works is the best! Able to mow my lawn early in The morning, because it is so quiet
Date published: 2022-05-08
Rated 5 out of 5 by from Performance of the 40V cordless mower The mower works great. I have cut the lawn a few times with it and it gives a good, clean cut. In fact one of the times I had let it go for two weeks and it was several inches high and the mower went over it with no issues and didn't even lose power. .
Date published: 2022-05-02
Rated 5 out of 5 by from My dream This is my second Greenworks lawnmower and I’m so pleased with it. My last lawnmower was corded and now I have cut the cord! It is so quiet and has a push button start. No cords to yank like those annoying gas lawnmowers. The batteries last through the whole mowing. After mowing I can quickly charge them again for the next mowing. My neighbor wants one now.
Date published: 2022-04-09
Rated 5 out of 5 by from I'd buy it again. It works great. It cuts evenly and the 2 batteries last through the whole job. I have almost 6,000 Sq Ft to mow. And the batteries are interchangeable with the edger and leaf blower.
Date published: 2022-04-08
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Rated 5 out of 5 by from 4 years on, still a great mower I got this mower on a whim as my 4 year old Craftsman gas mower was aging very poorly, requiring much more effort to start than when I bought it (it was well cared for, but oh, how the mighty have fallen). I was a bit concerned about its ability to cut heavier greass and the smaller 20" width making lawn cutting more time consuming, but those concerns were for naught. This very light-wieght mower cuts as well as any previous mower I've owned and it's MUCH easier to push compared to those old steel gas-guzzlers. No annual maintenance (other than hosing off), very low noise, no hands smelling of gasoline, battery capacity has remained excellent. HIGHLY RECOMMEND!
Date published: 2022-06-23
Rated 5 out of 5 by from Mower and batteries Bought this about a month or so ago and LOVE it!!! Nice and clean cuts…love the fact it is a push button start and with gas prices being so high I don’t have to worry about it.
Date published: 2022-06-20
Rated 5 out of 5 by from cuts very well very good mower. the batteries run out as I finish the yard.
Date published: 2022-06-05
Rated 5 out of 5 by from Well designed and works great From the handles to the vertical stove this is a well designed machine. I LOVE this thing and can't wait each week to mow?
Date published: 2022-05-28
Rated 5 out of 5 by from The Best Mower I’ve Owned! This is my 2nd and still preferred brand. Green works is the best! Able to mow my lawn early in The morning, because it is so quiet
Date published: 2022-05-08
Rated 5 out of 5 by from Performance of the 40V cordless mower The mower works great. I have cut the lawn a few times with it and it gives a good, clean cut. In fact one of the times I had let it go for two weeks and it was several inches high and the mower went over it with no issues and didn't even lose power. .
Date published: 2022-05-02
Rated 5 out of 5 by from My dream This is my second Greenworks lawnmower and I’m so pleased with it. My last lawnmower was corded and now I have cut the cord! It is so quiet and has a push button start. No cords to yank like those annoying gas lawnmowers. The batteries last through the whole mowing. After mowing I can quickly charge them again for the next mowing. My neighbor wants one now.
Date published: 2022-04-09
Rated 5 out of 5 by from I'd buy it again. It works great. It cuts evenly and the 2 batteries last through the whole job. I have almost 6,000 Sq Ft to mow. And the batteries are interchangeable with the edger and leaf blower.
Date published: 2022-04-08
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When I power my lawn mower on, there's a red light illuminated above ones of the batteries. Is that signifying which battery is being used at the time?

Asked by: Buzzard JL
Hello Buzzard JL, Yes, the red light indicates which battery is currently being used.
Answered by: Greenworks Support
Date published: 2022-06-20

I think a belt has died on mine. Make a whining noise when engaged and blades will not spin. Best way to resolve this?

Asked by: TonyRidge
Hello TonyRidge, We're sorry to hear about your experience with this lawnmower! It sounds like you will need to contact us directly as some further information would be required to better assist. We kindly ask that you give us a call at 1-888-909-6757 (1-888-90WORKS). Please ensure that you have access to the unit, battery, and charger upon calling so that we can complete troubleshooting with you and gather the necessary unit information.
Answered by: Greenworks Support
Date published: 2022-06-13

Can I order a replacement Mulching plug?

Asked by: JD138
Hi JD138, Yes, you can! The part number is 34141486; you can purchase one HERE: https://greenworks.ordertree.com/greenworks-mulching-plug-34141486.html
Answered by: Greenworks Support
Date published: 2022-05-24

What is the weight of this machine without bagger

Asked by: Marketab
Hello Marketab, The lawnmower weighs approx. 51.1 lbs. without the bag.
Answered by: Greenworks Customer Care
Date published: 2022-05-24

Hi ,how long should the battery be charged ,and is it important to run the batteries down until the mower wont operate ?

Asked by: mox7
Hello mox7, The 2.0Ah battery typically charges in 1 hour and the 4.0Ah charges in two hours. The battery will not develop a memory and may be charged at any time.
Answered by: Greenworks Support
Date published: 2022-05-18

Do you sell replacement blades for this model?

Asked by: ko628
We do! Here is a link where they can be viewed and purchased: https://www.amazon.com/Greenworks-10-Inch-Mower-Replacement-29712/dp/B00KA783HK/ref=sr_1_1?keywords=29712&qid=1652383707&s=lawn-garden&sr=1-1
Answered by: Greenworks Support
Date published: 2022-05-12

Can I use these batteries in my greenworks dethatcher scarifier? Can I use my battery from the dethatcher in this mower?

Asked by: Craig TN
Hello, We have designed all of our tools to be interchangeable within the same voltage series so that said, you would be able to use any of our Greenworks 40V batteries in any of the Greenworks 40V tools (GMAX, Max or Elite product lines). The higher the ampere-hour (Ah) rating is, the greater the run time.
Answered by: Greenworks Support
Date published: 2022-05-05

how to install this lawn mower after the battery is charged well, the instruction isn't clear, it is too hard to understand it. do you have video showing

Asked by: Anonymous
Hello Ellen Yang, Sorry to hear of the challenges you are experiencing. Currently we do not have a video to share but we can definitely walk you through the steps and if you still have any questions and would like to speak to a Greenworks Customer Care directly please call 1-888-909-6757 (1-888-90WORKS), and we would be happy to assist you further in remedying an issues. Installing the battery: • Raise the battery cover. • Place the battery pack in the mower. • Align raised ribs on battery pack with grooves in the mower’s battery port. • Push down into battery compartment until the battery clicks into place. • Lower the battery cover. • When installing the 73Wh Battery, follow the instructions above. There will be a gap between the battery and battery compartment. This is normal. Starting the lawn mower: 1. Install key. 2. Press and hold the start button down for ~3 seconds then while still holding the start button down pull back the bail lever towards the handle with your opposite hand. 3. Once the unit has started, you can release the start button and simply hold back the bail for continued operation. Hope these tips help!
Answered by: Greenworks Customer Care
Date published: 2022-04-26
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40V 20" Cordless Lawn Mower w/ 4.0 Ah & 2.0 Ah Battery
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