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

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21-Inch Brushless Cordless Lawn Mower is rated 3.9 out of 5 by 47.
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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 5 out of 5 by from Love this mower! I am 62yrs old. My children bought the greenworks 40v mower for me as I was in an accident that made it difficult for me to pull the cord on my gas mower. I found it very easy to use, and had no problem putting in, or taking out the batteries. The extra holder for the spare battery sure saves time. I did not get the self propelled one, and found it wasn't necessary as this one is easy to push. The height adjustment is also easy to use, and the mower cuts the lawn beautifully. It is a lot quieter than my gas mower- I can even hear my phone ring when operating the mower. A simple push button to start and you're on your way to a perfect lawn.
Date published: 2019-05-24
Rated 4 out of 5 by from Greenworks 40V Mower I have had my 21" 40V mower for two summers now. I love it! I have two batteries that I rotate thru and cut my 1/4 acre yard in no time with no problems. ALSO - mulch leaves in the fall - works like a vacuum cleaner on my tons of oak leaves! ONLY ISSUE IS I wish that it has a meter visible on the battery life while you're cutting the grass. On this model, the compartment is covered in that green plastic so you can't see how much power you have left. I'm sure that the next redesign will have a meter visible to show while you're cutting grass - like a gas gauge on some gas mowers, etc.
Date published: 2019-01-29
Rated 2 out of 5 by from Cuts good but horrible battery life Company claims 60min run time and able to cut 1/2 acre. My lawn is less than a quarter acre. I had both batteries on charge overnight, all indicator lights showed both batteries were fully charged. When I went to cut my lawn for the first time with this mower got maybe 10-15min out of each battery. Grass was about 2-3” high and dry. Maybe I was unlucky and just happened to get the 2 bad batteries in the bunch? Otherwise, this product does not live up to the performance that manufacturer claims. 
Date published: 2018-09-18
Rated 3 out of 5 by from Great cut, the stock battery life is poor. Cuts the grass well. My yard is about 2/3 of an acre and I was expecting to have to swap batteries a few times. I already had a 40v Greenworks weedeater, so I have 3 2.5 ah batteries in total to use. I can mow the front lawn on one battery in about 20-30 minutes. The rear and sides of the house, took me a couple hours, as I used all 3 batteries, and had to let them recharge. That was mowing at the max height. Grass wasn't even that thick, other than a few areas where my old leech bed was. That was also using it in mulching mode. Not sure if I switch to side discharge, if that will take any strain off the motor and prolong the battery life any. Overall I am happy with the mower and the cut, but I am looking into larger capacity batteries for it. Would be a better value if it had some 3.0 or 4.0 ah batteries instead.
Date published: 2019-06-19
Rated 4 out of 5 by from Easy to use but battery removal is HARD Ihave been using this mower for 2 years now at my coastal home. It is holding up better than most of the previous mowers to the salt air. It runs well but gets clogged up sometimes due to the increased moisture on the coast. I do not have the battery run time problem most talk about, my batteries do last but they are SO HARD TO REMOVE from the mower. I have had carpal tunnel surgery and there is not much to grab onto to pull them out of the mower. Please have your engineers redesign the batteries or put a pull strap on them for us folks that do not have the strength to grasp and wiggle those batteries out.
Date published: 2020-04-09
Rated 5 out of 5 by from Absolutely outstanding value Purchased this mower a month ago. With all of the rain recently, I have had enough uses to clearly appreciate this product! It is perfectly sized for my yard. Two batteries do the job with a little energy leftover. The convenience cannot be overstated. Roll it out, press a button, squeeze the handle, and off we go. I have only used the mulching feature and see no reason to do otherwise. There is no evidence of clippings and the lawn looks like a carpet. I was unsure about making a purchase of this technology, but caught it at a discount and took a chance. Completely satisfied and would have been at full price. The batteries make a product like this, and these are amazing products in their own right.
Date published: 2019-06-01
Rated 3 out of 5 by from Good price, batteries worthless So I just bought this lawnmower due to the price and the small yard I have, however reading the info it shows that I should be able to mow my whole yard without having to change the battery. I put the battery on the charger and it says it's full but the battery shows 1 bar, also when 4 bars was at 1 bar in less than ten minutes.i am not happy with this if it will take me 8 hours to charge, mow, rinse and repeat 20 times.
Date published: 2019-05-05
Rated 2 out of 5 by from Quit, light, cuts good BUT TERRIBLE BATTERY LIFE I was very happy until first battery died just after 14 minutes of usage, between the 2 batteries it was 30 minutes. I will need a 3rd battery to be able to complete my yard. Very very disappointed with battery performance, I mowed about 350 sq yards and grass was not even large, I just did it because I couldn't wait.
Date published: 2018-12-11
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I have a 1000 sq feet of grass, what mower should I get

Asked by: jon todd
Hello jon todd, Any of our units will work in 1000 sq feet lawn. This model would be sufficient. For grass that is thicker and denser we would advise looking at our GreenWorks 60v and 80v line.
Answered by: GreenWorks Support
Date published: 2020-10-14


Asked by: Arthur27
Hello Arthur27, No, the ports do not automatically switch over.
Answered by: GWT Customer Support
Date published: 2020-08-03

Is it possible to get a manual for my mower. It apparently did not come with it, this was a gift.

Asked by: Rick Sut
Hello Rick Sut, We are sorry the manual was not included with your tool. We have selected manuals available online at this moment in time. Please send an email to info@greenworkstools.com and we can have manuals to your requested models sent. Please use the following link to access the owner's manual electronically: https://www.greenworkstools.com
Answered by: GW Customer Agent
Date published: 2020-07-24

What is its horse power/ watts, does it use a belt or chain

Asked by: JonMark
Hello JonMark, The unit has 1.5kW motor and the unit is direct drive. There is no belt.
Answered by: GWT Customer Support
Date published: 2020-07-10

Does this model have ball bearings in the wheels? Is the motor brushless? It is available / work with 4Ah batteries?

Asked by: NeilB
Hello NeilB, Yes, the wheels have ball bearings. The unit is brushless. Model MO40L410 does come with a 4.0Ah battery and a charger.
Answered by: GWT Customer Support
Date published: 2020-06-25

I only need the mower as have battery and charger with other tools 

Asked by: AJB3
Hello AJB3, We currently have the 20 inch in a tool only option. https://www.greenworkstools.com/40v-20inch-cordless-dual-port-lawn-mower
Answered by: GreenWorks Support
Date published: 2020-06-24

What is the best way  to care for my 60v battery. Charge often or let run down? 

Asked by: Adam K
Hello Adam K, The battery can be stored at any state. The most important storage condition is the temperature which should be at a consistent temperature (room temperature). Please refer to your owner's manual for more information on storage.
Answered by: GWT Customer Support
Date published: 2020-06-15

You offer many options as to the number of Batteries, and their Power Rating. My yard is approximately 4500 SqFt. Which of your Mowers would you recommend for my yard which has ins/outs/diversions.  

Asked by: SgtPepper
Hello Sgt Pepper, We would recommend batteries that are at least 4.0Ah (amp hour) or higher. This model comes with two 2.5Ah batteries and will require a quick change in between use. It may only offer 20 minutes per use per battery. Unlike, a 4.0Ah or 5.0Ah battery that will offer a continuous runtime. However, the choice is yours. Additional batteries may be needed for optimal runtime.
Answered by: GWT Customer Support
Date published: 2020-05-25
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Deck Size:
21 Inch
Deck Material:
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:
Smart Cut Technology:
Discharge Features:
Tool Warranty:
2 Year
Battery Warranty:
3 year
Battery Capacity:
Battery Capacity 2:
  • (1) 40V Cordless 21" Brushless Lawn Mower
  • (1) Grass Collection Bag
  • (2) 2.5 Ah Batteries
  • (1) Battery Charger
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