40V Cordless 21" Brushless Lawn Mower w/ (2) 2.5 Ah Batteries

In stock
Model
MO40L2512
$399.99
In stock
21-Inch Brushless Cordless Lawn Mower is rated 3.7 out of 5 by 38.
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  • Includes two 40V 2.5 Ah batteries and charger
  • 3 Year Limited Tool & Battery Warranty

Perfect for yards up to 1/2 acre, Greenworks 40V tools are lightweight, start instantly, and require virtually no maintenance – no gas, no oil, no mess – but still deliver gas-like power.

  • Brushless motor for more torque, quiet operation, and longer life
  • Innovative Smart Cut™ technology automatically increases the speed of the blade when more power is needed
  • Durable 21" steel deck
  • 3-in-1 capability allows you to mulch, bag or side-discharge
  • Includes two 40V 2.5 Ah batteries and charger
  • 3 Year Limited Tool & Battery Warranty
Rated 1 out of 5 by from Takes days to cut my lawn, battery life is awful Bought earlier this summer, the store said 45 to 60 mins runtime for the batteries but that's completely false! Maybe 10 mins per battery (2). We brought it back to the store and exchanged for a new mower thinking the batteries or charger were faulty but new one works exactly the same. Takes days to mow my yard because have to charge in between. Definately will never buy this brand again.
Date published: 2019-07-26
Rated 4 out of 5 by from Quiet and Effective It's good that this mower comes with two batteries, because you WILL use both of them. However, the mower does exactly what it is supposed to do and well.
Date published: 2018-08-13
Rated 1 out of 5 by from Poor battery design The battery is almost impossible to remove. It is designed to be squeezed from the top and vertically lifted out of the battery compartment. There is nowhere to grip the battery to lift out and the battery latch sometimes does not allow it to be removed. A fatal design flaw on an otherwise great mower.
Date published: 2018-08-11
Rated 5 out of 5 by from very good mower very stout bought two months ago glad I did. mows very good, long bsttery life
Date published: 2018-08-22
Rated 1 out of 5 by from Great cut, terrible battery life. Stock 2.5 battery lasts 8 minutes runtime. Horrible. Worthless.
Date published: 2019-09-08
Rated 2 out of 5 by from This would be a great product but... The battery life doesn't last to what it claims. My battery last only 10-15mins.I now have stop to recharge to finish mowing. I would need 4 batteries to last about 50 mins. If it wasnt for the battery life this product would be the perfect mower. I have whole set of out doors product everything else is great.
Date published: 2018-09-29
Rated 1 out of 5 by from REALLY UNHAPPY Had this mower for just over 1 year. It included 2 batteries. After the first couple of months, 1 battery refused to take a charge. Pulled it out today and the second battery shows fully charged but mower won't start. Replacement batteries are outrageously priced. Hoping to hear back from customer service to get this resolved.
Date published: 2020-05-02
Rated 4 out of 5 by from Fun machine!! I went to cut the lawn of my friend as he hurt his leg, I used his mower and I was shiced when he said just throw the battery in!! It was like Star Wars!! It was so light and cut so nice!! I love it, and now I'm a Green Works lover!!
Date published: 2018-08-10
Rated 5 out of 5 by from Easy to use I just bought the Greenworks 20" 40v brushless mower (mo40l00) assembled it with no problem and got mowing. Goes over sticks with no problems. Battery that comes with it does not last as long as the description says it will. It lasts about 30 minutes. Only used it twice so far - it meets all my expectations. When the mower beeps at you, it means the battery needs recharging. Will probably buy a second battery. The plastic side discharge chute comes inside the grass catcher bag.
Date published: 2019-05-11
Rated 5 out of 5 by from Well done! I've had mine for about a month now, used it 3 times. This is a sturdy, well designed mower that is easy to push. I only wish I could manually choose the higher motor speed.
Date published: 2018-10-07
Rated 5 out of 5 by from Great Mower I bought this mower to replace a G-Max 40V 20 inch Twin Force mower. I've used the previous mower for 6 years and have been pleased with it as it is quieter and more convenient than any gas mower, but it is wearing out. The 21 inch mower is even better. It is noticeably quieter, adds a side discharge option in addition to mulch or bag, and allows 7 rather than 5 mowing heights. My only caution to a prospective buyer is that the estimate for how much you can mow is pretty optimistic. It varies greatly depending on the height, thickness, and moisture of the grass, but I would plan on needing extra batteries for more than an eighth of an acre. I have about a quarter acre, and extra batteries, and typically use four or five to mow everything. (It comes with two batteries.) I am very pleased with both mowers.
Date published: 2019-06-30
Rated 5 out of 5 by from Great Mower Have not had mower long. Bought for my wife to use, light weight, easy height adjustment, light weight batteries.
Date published: 2018-08-10
Rated 5 out of 5 by from Great gas saver I bought this mower 3 years ago and still works perfectly. Will buy again when this one dies.
Date published: 2018-08-13
Rated 1 out of 5 by from Poor Battery Life. Horrible run time for these batteries. Takes 3 days to do my yard work!
Date published: 2019-10-17
Rated 3 out of 5 by from Good cut Light and easy to use - good cut - POOR BATTERY PERFORMANCE!!
Date published: 2019-06-13
Rated 5 out of 5 by from Lightweight and very easy to operate! The cordless lawnmower is absolutely wonderful. It starts immediately, no gas to get, store or smell and risk spilling in the car. It is lightweight and very easy to operate. The battery lasts a long time. I can almost mow my front, side and backyard all on the initial battery charge. I did purchase an extra battery just to have if or when needed. I have a corner lot with front, side and backyard. Not sure of the dimentions.
Date published: 2020-08-04
Rated 5 out of 5 by from My first of many Greenworks tools I bought this for my husband- but really for myself. I'm 68 with advanced rheumatoid and just couldn't pull that gas mower chord to start. My husband was constantly rebuilding carburetors because of fuel damage. Those woes have disappeared! This mower is perfect!!- lightweight- no noise -always ready to go. The lawn looks fantastic.
Date published: 2020-08-06
Rated 3 out of 5 by from Battrey Life kills it Dont want to write bad, after reading so much good, I went ahead and bought this, I knew 1st cut after spring will be hard, but with 4k sq ft, I cant get enough , its performance fails with a bit of slope, cuts are not bad at all, I have to recharge my batteries and come back the next day to finish my yard, I have the most flat lot in my neighborhood, I am bit disappointed with the battery life.
Date published: 2020-05-20
Rated 2 out of 5 by from So Disappointed Friends recommended this lawn mower. I purchased 2 batteries knowing I could alternate them. My lot is 1/8 of an acre with 1200 sq ft ground floor, 2 car driveway, a 22*22 ft cement patio and a 9*9 concrete spa pad. my point i have very little lawn and can't even get it all cut with 2 batteries. Really wanted to love the mower but with the batteries I can't
Date published: 2020-05-06
Rated 5 out of 5 by from Consider this one of my top 10 purchases ever. Entering my third season with this mower. The only thing keeping it from being a top five purchase is that I was dumb and didn't get the self propelled model. I have a 3,000 square foot yard and can mow the yard, weed eat and blow the sidewalk, driveway and patio clean all with the same 5ah battery. Also have a pole saw and snow thrower. Great products!
Date published: 2020-04-23
Rated 4 out of 5 by from Awesome mower This is a great mower, like the ease of height adjustment, the 3 cutting options, bagger, mulch or side discharge, the ability to carry 2 batteries. The only con I have is that it doesn't come with the larger capacity batteries. I have the 16 inch chain saw it uses the same voltage battery but has a larger AH capacity. Overall great product.
Date published: 2019-07-05
Rated 5 out of 5 by from Perfect for my needs I cut about an acre of grass total using a zero turn rider for the bulk of the job but have areas too small to use it. The 21-inch Brushless is the perfect answer and my wife finds it very easy to use and she is 64 years old and a mere 5'3' and 110 lbs.
Date published: 2019-08-20
Rated 2 out of 5 by from Stopped Working? Worked great for the first two mowings. Then the start/stop switch failed. Talked to Customer Service and we went through several system checks. Still dead. No Start. Going back for unit number two. Hope this second unit lasts.
Date published: 2019-07-09
Rated 4 out of 5 by from Quiet and easy Very nice change from the old gas mower. Only mowing about a quarter acre but almost get two mowings out of one charge. Only complaint and it’s minor: it takes a couple seconds to engage self propelled feature
Date published: 2020-07-16
Rated 5 out of 5 by from Light weight but built very sturdy. I’ve used the mower 3 times with ease. Battery has a long life which gets me through a complete cutting without stopping. This 40 Volt mower replaced a defective 80 Volt Kobalt self propelled mower.
Date published: 2019-10-22
Rated 5 out of 5 by from Powerful and long lasting battery Cuts awsome cuts my front yard side of my house in 25 minutes and still have 2 bars left on the battery and my grass is thick and wet very good buy
Date published: 2020-06-12
Rated 5 out of 5 by from owner's manual in PDF The owner's manual is too hard to read - do you have a link to a PDF?
Date published: 2019-12-04
Rated 5 out of 5 by from Surprised Surprised how long my battery work one battery front yard !
Date published: 2019-05-30
Rated 4 out of 5 by from quiet, dependable I bought this a year ago. I can't speak to durability.
Date published: 2019-06-07
Rated 4 out of 5 by from Great Mower, Battery Life is Shorter then expected I love this mower and so glad I bought it. It replaces a gas mower and I like being able to pull it out of the shed and start with no oil checks, pouring gas or 10 pulls of a cord. The Innovative Smart Cut technology automatically increases the speed of the blade when more power is needed and at first worried me. The power upped the speed as I went over a large clump and you can hear it rev up. But it did the job. The handle is comfortable, the height adjuster easy to move and putting battery in/out easy. Metal body is nice too, some out there are plastic. Battery life is an issue with this 40V mower. I have 1/4 acre with a house in the middle. I can do the front lawn with 2 batteries, then I charge them overnight and do the back yard the next day. This is with very short grass, we'll see how this handles summer grass in a few months With the grass mower I would do it all at once. Mulching. It does seem to mulch nicely but only grass and small leaves. They warn about mulching twigs and such which is a good idea since the piece that holds the blade is green plastic and looks like it could break if mulching yard waste including medium sticks. My gas mower handles that fine. I bought this at a big discount so that was why I chose this brand. However, I am happy to see they have a full set of 40V tools so I may invest in a blower and chainsaw. In general, its a battery mower so don't expect the world. I like that its easy and quiet to use.
Date published: 2019-04-24
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Last year (2019) was my first with the Max 40V, and it did a great job. However, after I fully charged the batteries, I took it out today it won't start. Nothing. I have tried both batteries. Suggestions?

Asked by: RussSteve84
Hello there, Only common issue we hear of for initial startups are as follows: Press and hold in on the switch round safety lock out button, while continuing to push it in pull back on the bale. Hoping this was maybe a misstep and will be able to correct with these instructions. Please let us know we can be reached at 1-888-909-6757 (1-888-90WORKS) or by email on info@greenworkstools.com.
Answered by: GW Customer Agent
Date published: 2020-05-12

What about repair and maintenance? Are there local dealers that we can take the mower to, for repair and maintenance, who can service these mowers on the basis of the warranty, and get them back in a reasonable time period?

Asked by: Michael E
Hello Michael, We do advise that you speak with our support team prior to taking the unit down to a repair center. Please follow the link below for service centers in your area: https://www.greenworkstools.com/parts-and-repairs Information on maintenance is located inside the owner's manual. We hope this information has helped.
Answered by: GWT Customer Support
Date published: 2020-04-30

Can 4.0 ah batteries be used with the 40v 21 in mower that comes with 2.5 ah batteries?

Asked by: rubbertoe
Hello rubbertoe, Yes, as long as the batteries are from the GreenWorks G-Max 40v line. The G-Max 40v batteries and units are all interchangeable.
Answered by: GreenWorks Support
Date published: 2020-04-13

What other models are brushless? In reviewing the selection does the word “brushless” need to be in the title for the mower to have that function? I do not want to exceed $400. Thank you, Constance Thank you , Constance 

Asked by: Conni
Hello Conni, Thank you for your questions. All brushless models are identified in their description. To check out a list of our brushless mower, you can do a search "brushless" in the search bar a drop-down list will show you all the available brushless mowers. Please note, there is a version sold with a battery and charger as a kit as well as the version that is sold without which is known as "tool only." These tools are ideal for customers that have a pre-existing tool. If this is the first tool in the GreenWorks platform we would advise customers to purchase a unit with the battery and charger included. If you have any further questions, suggestions or comments, give us a shout on info@greenworkstoos.com or speak to an agent directly at 888-909-6757.
Answered by: GW Customer Agent
Date published: 2020-04-12

What is replacement blade part number for this mower

Asked by: DawnP
Hello DawnP, The replacement blade is item: (333041179/2903402) you can order from our third-party part site here: https://greenworks.ordertree.com/
Answered by: GW Customer Agent
Date published: 2020-04-12

I couldn't find what is the cutting height for each height level from the manual. Is it equally distributed between the minimum and maximum height? Thanks.

Asked by: LY032
Hello there, These are the 7 heights setting for this lawn mower: 1-3/8" / 1-7/9" / 2-1/6" / 2-5/9" / 3" / 3-1/3" / 3-3/4"
Answered by: GreenWorks Support
Date published: 2020-04-11

Hi. What is the replacement blade part number for the MO40L2512 40v 21” mower

Asked by: John2
Hello John2, The replacement blade is item: 333041179/2903402
Answered by: GreenWorks Support
Date published: 2020-04-09

Can you buy this mower without the batteries? I already have 3.

Asked by: tcheevers
Hello there, You can purchase the tool only option here: https://www.greenworkstools.com/40v-21inch-cordless-dual-port-lawn-mower
Answered by: GreenWorks Support
Date published: 2019-12-09

Do you know the maximum height adjustment. My St Augustine grass should be 4 inches.

Asked by: Alla
Hi there, The height adjustment range is between 1 3/8 - 3 3/4” (3.5 - 9.5 cm).
Answered by: GreenWorks Support
Date published: 2019-12-06

When will you have this back in stock

Asked by: Anonymous
Hello there, We’re sorry for the inconvenience of this lawn mower being currently out of of stock. We are working diligently to have these items back in stock as soon as possible.
Answered by: GreenWorks Support
Date published: 2019-11-05

Is this machine self propelled or a push mower?

Asked by: Joey23
Hi there, Thank you for your inquiry. This model is not self-propelled.
Answered by: GreenWorks Support
Date published: 2019-10-25

Is this mower self propelled ?

Asked by: Steve1
Hi Steve1, Thank you for your inquiry. No, this model is not self-propelled.
Answered by: GreenWorks Support
Date published: 2019-10-25

What replacement blade do I need for this mower?

Asked by: BobboC
Hi BobboC, You can purchase replacement blades using the following link: https://www.greenworkstools.com/80v-21inch-replacement-lawn-mower-blade or you can contact us at 1-888-909-6757 for replacement parts.
Answered by: GreenWorks Support
Date published: 2019-10-21

Will the 40v Elite batteries work in this lawn mower or will it only woirk with the 40v Gmax batteries?

Asked by: Anonymous
Hello there, This unit would be compatible with Greenworks 40V Elite batteries.
Answered by: GW Customer Agent
Date published: 2019-09-19

I have this mower and am unable to get the side discharge hatch to remain open. Am I missing an attachment or is there an obvious solution that I am not seeing?

Asked by: SarahS
Hello there, To hold the side discharge door open, you would need to install the side discharge chute that should have been included with the unit upon purchase. Please see the instructions below (also found in owner's manual on page 18). If any parts are missing please contact our helpline at 1-888-909-6757. INSTALLING SIDE DISCHARGE CHUTE • Lift the side discharge cover. • Align the grooves on the side discharge chute with the pins on the underside of the discharge cover. • Lower the discharge chute until the hooks on the mower deck are secured in the openings of the discharge chute. • Release the side discharge cover.
Answered by: GreenWorks Support
Date published: 2019-07-26

Does the Greenworks 40v 4.0 AH (model 29472) battery work with this mower?

Asked by: Rocksteady
Hello there, All Greenworks 40V GMAX machines are compatible and interchangeable with all Greenworks 40V GMAX batteries and charger.
Answered by: GreenWorks Support
Date published: 2019-09-13

Do I use both batteries when mowing? How long does 1 battary last?

Asked by: Tntsassy
Hello there, While the run-time of a battery would depend on the load on the unit (speed, terrain, grass height and density), you can expect to receive an average of between 20-30 minutes of run-time with a single 40V 2.5Ah battery. There is only one one active port in the lawn mower. The other port is simply for storage of for carrying the battery with you while mowing.
Answered by: GreenWorks Support
Date published: 2019-07-31

HOW MUCH DOES THE M040L2512 21INCH 40V WEIGH

Asked by: HARVEY1
Hello there, This lawn mower weighs 61.46 lbs (27.88 kg).
Answered by: GreenWorks Support
Date published: 2019-07-05

Would the 40 volt max 4.0 ah battery work in this mower

Asked by: Mhpmhp
Hello there, All Greenworks 40V GMAX machines are compatible and interchangeable with all Greenworks 40V GMAX batteries and charger.
Answered by: GreenWorks Support
Date published: 2019-09-13

what batteries work with this model?

Asked by: LesNo
Hello there, All Greenworks 40V GMAX machines are compatible and interchangeable with all Greenworks 40V GMAX batteries and charger.
Answered by: GreenWorks Support
Date published: 2019-09-13

what is the difference between the Gmax and this 40V ?

Asked by: lwill
Hello there, this lawn mower is a 40V GMAX unit. All Greenworks 40V GMAX machines are compatible and interchangeable with all Greenworks 40V GMAX batteries and charger.
Answered by: GreenWorks Support
Date published: 2019-09-13

How much does this mower weigh and is it a single blade?

Asked by: Dougger
Hello there, This lawn mower weighs 61.46 lbs (27.88 kg) and it has a single cutting blade.
Answered by: GreenWorks Support
Date published: 2019-06-27

Hello, we have this exact mower and are curious what does the beeping code mean? Is the battery dead or is the motor running hot? It beeps 3 times then pauses before repeating.

Asked by: Panda1150
Hello there, Normally, 3 beeps means that the battery has been depleted and would need to be replaced with a fully charged battery. If after verifying this you still are unable to operate the lawn mower, please contact our helpline at 1-888-909-6757.
Answered by: GreenWorks Support
Date published: 2019-06-21

I see Greenworks offers 3.0 and 4.0 ah 40v batteries. Can I use these with this mower? The compartment looks to have the clearance, and if so, is there a particular model and or would I need a different charger?

Asked by: Daniel A
Hello there, All Greenworks 40V GMAX machines are compatible and interchangeable with all Greenworks 40V GMAX batteries and charger.
Answered by: GreenWorks Support
Date published: 2019-09-13

will this run of the greenworks 40v 2.0ah battery. It is pictured with a 2.5 ah battery

Asked by: Anonymous
Hello there, All Greenworks 40V GMAX machines are compatible and interchangeable with all Greenworks 40V GMAX batteries and charger.
Answered by: GreenWorks Support
Date published: 2019-09-13

How long does the battery stay charged?

Asked by: Sprizz
Hello there, While the run-time of a battery would depend on the load on the unit (speed, terrain, grass height and density), you can expect to receive up to 20-30 minutes of run-time with a single 40V 2.5Ah battery.
Answered by: GreenWorks Support
Date published: 2019-05-27

Is this self propelled?

Asked by: Kristel
Hello there, No this is not a self-propelled lawn mower.
Answered by: GreenWorks Support
Date published: 2019-05-17

Your tech support number has been disconnected. Who do I call to get help with my 24hr old mower that just beeps?

Asked by: Myron
Hello there, We apologize for the difficulty in reaching our customer service helpline. We did experience some technical difficulties with our support number, however it is now back up and operational. Normally a battery would beep to indicate that the battery needs to be charged or that there is an internal issue with the unit. If after verifying the charge of the battery you are still experiencing issues, please gives us a call again at 1-888-909-6757 for further assistance.
Answered by: GreenWorks Support
Date published: 2019-05-17

Will a 4 amp hour 40 v battery work in the dual port 21-inch mower?

Asked by: Anonymous
Hello there, All Greenworks 40V GMAX machines are compatible and interchangeable with all Greenworks 40V GMAX batteries and charger.
Answered by: GreenWorks Support
Date published: 2019-09-13

The batteries for this mower get hot and stop the mower.  Both batteries are doing it. I can’t complete a 400 sq ft front yard without the battery getting hot and quitting. How is this fixed?  Bought September 2018. 

Asked by: Kykaren
Hello there, We're sorry to hear about your issue with the lawn mower batteries. If you are storing the batteries on the charger, this may be why the batteries are heating and shutting off the lawn mower. so we would be able to assist in addressing this issue., please kindly contact our customer service helpline at 1-888-909-6757.
Answered by: GreenWorks Support
Date published: 2019-05-09
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Deck Size:
21 Inch
Deck Material:
Steel
Cutting Heights:
7 Position
Max. Cutting Height:
3 3/4 in.
Min. Cutting Height:
1 3/4 in.
Front Wheels:
7 Inch
Rear Wheels:
10 Inch
Vertical Storage:
Yes
Smart Cut Technology:
Yes
Discharge Features:
3-in-1
Tool Warranty:
3 Year
Battery Warranty:
3 year
Battery Capacity:
2.5Ah
Battery Capacity 2:
2.5Ah
  • (1) 40V Cordless 21" Brushless Lawn Mower
  • (1) Grass Collection Bag
  • (2) 2.5 Ah Batteries
  • (1) Battery Charger
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