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Greenworks 40V 20" Twin Blade Mower, 4.0Ah + 2.0Ah Battery

4.2 4.2 out of 5 stars 6,916 ratings

$399.99

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Size: 40V 20" (4.0Ah + 2.0Ah)
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Brand Greenworks
Power Source Battery Powered
Material Plastic
Color 7Pin to 7Way 4Way Adapter
Style Mower
Item Weight 42.5 Pounds
Cutting Width 20 Inches
Operation Mode Battery
Product Dimensions 29.2"D x 20.66"W x 19.5"H
UPC 841821010003

About this item

  • CORDLESS 20” LAWN MOWER – Get more done, faster, with Greenworks electric lawn mowers. This 40V push mower provides the power you need with up to 45 minutes of run-time on a fully charged 4.0Ah and 2.0Ah battery.Brushless motor : No.No load speed : 6000 RPM
  • LIGHTWEIGHT, EASY TO USE – a lightweight 20” cutting deck allows for easy maneuvering through small to medium yards (up to ½ acre) more efficiently
  • TWIN BLADES - offer better cut quality, superior mulching, and bagging capabilities
  • AUTO SWITCH / SMART CUT TECHNOLOGY – dual battery ports with auto switch allows for uninterrupted mowing. Smart cut technology adjusts for power or runtime based on the thickness of your grass
  • MAINTENANCE FREE – This walk behind lawn mower is virtually maintenance free, with no gas, no oil, and no emissions. It starts instantly and is quiet, but delivers gas-like power for your toughest projects
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DUAL BLADE LAWN MOWER
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Greenworks 40V 20" Twin Blade Mower, 4.0Ah + 2.0Ah Battery


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Product Description

Our Greenworks 40V Dual Blade/Dual Battery Port Mower is perfect for yards up to 1/3 acre with a total battery run-time of approximate 70 minutes. The G-Max 40V is a dual blade mower designed to deliver better mulching, cutting and bagging. The Dual Battery Port automatically switches to the backup battery for a longer run-time, making it easier to get the job done. All this without the hassle of gas, cords or maintenance. One-Battery fits all of our 40 Volt system that includes over 40+ tools to choose from (tools not included). Deck Material: Plastic, Deck Type: Stamped.

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Greenworks 40V 20" Twin Blade Mower, 4.0Ah + 2.0Ah Battery
Greenworks 40V 20" Twin Blade Mower, 4.0Ah + 2.0Ah Battery
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Price$399.99$479.99$249.99-15% $229.88
List:$272.00
$521.66-17% $249.00
List:$299.99
Delivery
Get it as soon as Wednesday, Mar 5
Get it as soon as Wednesday, Mar 5
Get it as soon as Wednesday, Mar 5
Get it as soon as Wednesday, Mar 5
Get it as soon as Wednesday, Mar 5
Get it as soon as Wednesday, Mar 5
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Customer reviews

4.2 out of 5 stars
6,916 global ratings

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Customers say

Customers find the lawn mower easy to use and lightweight. They appreciate its quiet operation and maneuverability. However, some customers have differing opinions on battery life, cut quality, and battery charge.

AI-generated from the text of customer reviews

1,658 customers mention "Works great"1,521 positive137 negative

Customers are satisfied with the lawn mower's performance. They find it works well, has ample battery life, and its features work properly. Some say it's the best lawn equipment purchase they've made and quieter than their gas mowers.

"The GreenWorks Twin Force lawn mower, is powerful, quiet, and works really well. The GreenWorks mower is very nicely made...." Read more

"...This mower has great power, ample battery life, and it's features all work well. I will be buying more in the G-MAX line for sure." Read more

"...this time, the grass grew to nearly a foot, and this machine handled it no problem. When it needs more power, it turns on turbo and chews the grass...." Read more

"...I have found this unit to surpass my expectations of a battery powered mower and has convinced me to buy more Greenworks branded tools...." Read more

1,101 customers mention "Lightweight"1,049 positive52 negative

Customers appreciate the mower's lightweight design. They find it easy to start and move to their garage. The mower feels lighter without the bag, especially since it doesn't get heavier as you go.

"...The GreenWorks packs all of the power of those machines, but it’s very light, easy to maneuver, and so quiet...." Read more

"...I'm so glad I did. This mower is light, maneuverable, and the collapsing handle is a big bonus for me (limited storage)...." Read more

"...I love that it's so light and that it's so easy to start...." Read more

"...The unit arrived quickly in a large box that I was able to move to my garage easily. After 20 minutes I had a assembled mower...." Read more

1,016 customers mention "Ease of use"958 positive58 negative

Customers find the lawn mower easy to use and operate. They say it requires a small amount of assembly without tools, and the whole process took less than 30 minutes. The mower is very light and easy to turn on, with intuitive insertion and operation. They mention there's no need to check or change the oil, and it doesn't spitting emissions into the environment.

"...All of the components feel of high quality in the hand. Assembling the GreenWorks is easy; you just take it out of the box and attach the handle...." Read more

"...It's just something we all know. Starting it is simple. Just press the button and then pull the bar back and you're off...." Read more

"...Assembly was easy (pop out of box and tighten handle). Be advised there's a packing piece to hold blades in place...." Read more

"...It requires a small amount of assembly (no tools) and offers a reliable alternative to gas...." Read more

909 customers mention "Quietness"852 positive57 negative

Customers appreciate the lawn mower's quiet operation. They mention it runs quietly and doesn't require a muffler. The mower is easy to use and affordable.

"The GreenWorks Twin Force lawn mower, is powerful, quiet, and works really well. The GreenWorks mower is very nicely made...." Read more

"...It's also much quieter than I expected. Power-wise, this mower has been great...." Read more

"...It is so much quieter than a gas powered mower. It sounds like a blend of a box fan and a drone...." Read more

"...This is VERY quiet operation! I can carry on a conversation in a normal tone without raising my voice while mowing...." Read more

541 customers mention "Ease of maneuverability"491 positive50 negative

Customers appreciate the mower's maneuverability. They find it easy to push, handle on hills, and turn around. The lightweight design makes it simple to lift and clean after mowing.

"...packs all of the power of those machines, but it’s very light, easy to maneuver, and so quiet...." Read more

"...I'm so glad I did. This mower is light, maneuverable, and the collapsing handle is a big bonus for me (limited storage)...." Read more

"...I do enjoy that the light weight of the mower makes it easy to handle on the hills of my yard...." Read more

"...Pros - Light - Easy to maneuver - Powerful - Deck hangs out slightly past wheels to get edges better..." Read more

1,465 customers mention "Battery life"913 positive552 negative

Customers have different experiences with the lawn mower's battery life. Some say the batteries last long enough to mow their yard, and the 40V+20V battery is great. Others mention the 2Ahr battery dies after a few months of use, or that the battery slowly degrades over time.

"...Battery life is quite good. I’m able to mow my whole yard without having to stop and recharge...." Read more

"...This mower has great power, ample battery life, and it's features all work well. I will be buying more in the G-MAX line for sure." Read more

"...(working fine, though are starting lose some juice - I’d ballpark it at 85% of original charge, which is still..." Read more

"...It has two batteries, but only runs on one battery at a time...." Read more

870 customers mention "Cut quality"589 positive281 negative

Customers have different views on the lawn mower's cut quality. Some find it powerful and provides a better cut than the Worx single blade mower. However, others report issues like uneven cuts, leaving uncut areas, and cutting the grass once.

"...I found my lawn to be cut very evenly and I did not have to do multiple passes to get an effective cut...." Read more

"...between mowings, used the second lowest setting, and still had no trouble cutting. The grass catcher on the back also works well...." Read more

"...of the blades would struggle to spin from time to time and grass would be left uncut...." Read more

"...If my grass is a little damp, the mower cuts fine, but a lot of cuttings get stuck up inside around the blades...." Read more

645 customers mention "Battery charge"370 positive275 negative

Customers have different experiences with the battery charge. Some find it charges quickly and lasts 20 minutes, while others report issues like the batteries not charging right away or taking a long time to charge.

"...In my case, 99% of the time the GreenWorks operates on its low speed, but when it hits a thick patch of lawn, or some twigs, it ramps up to high..." Read more

"...this I decided to call in to greenworks to see why my batteries can't charge right away, and also to see if there is some reason the batteries don't..." Read more

"...Likewise, it does great in slowing down the blades when the power is no longer needed...." Read more

"...to drop the 2ah battery in the charger after use, the charger showed it as fully charged. I tried reseating it, but the same thing happened...." Read more

One of the best mowers I have ever used.
4 out of 5 stars
One of the best mowers I have ever used.
Okay so this review is for the 20-in greenworks twin Force 40 v electric lawn mower with the 4 amp hour battery and 2 amp hour battery. I was comparing this to an ego which my parents had purchased years ago and swear by it and I could not justify the price. So I decided to take a chance on this one having it been a little bit cheaper than the ego. some of the reviews are mixed and some of them are very detailed and there's a few that are basically a one-star rating and after weeding out the pros and cons of each review I decided to go with this so. If you purchase this from Amazon this will come on a truck it is a rather big box but it weighs from what I was able to decipher less than 50 lb. The box itself has handles in the side which are very flimsy and very weak I do not recommend that you lift the box using those handles as it will tear the box apart. Opening the box I was completely surprised as this unit was much lighter than my gas powered mower it contains the mower handle and a package with the charger and two batteries. This is very easy to assemble and requires no tools. The four amp hour battery took approximately 1 hour to charge the 2 amp hour battery took approximately 30 minutes or so to charge. So that being said, I noticed when I removed the 4 amp hour battery from the charger it was quite hot, this is not a big concern as it does cool down quite quickly and is comparable to any other 40 volt battery. The charger design is quite simple and is almost identical to all of the other rechargeable batteries it does have a lock so that when you insert the battery into the charger you must lock it in place you will hear click when it is locked to remove the battery you simply put on the lock button on the battery and slide it in reverse of how you inserted it. One thing to know is that read the instruction manual! With all other mowers you will pull back on the safety handle and then start the machine with this specific machine you hold in the start button and pull back on the lever once the machine is started you can let go of the start button. If you try it any other way the machine will not start. This is how I was able to narrow down a lot of the negative reviews that said that it doesn't work. People did not read the instruction manual. At first glance on the underside the blades seem extremely small but are quite sharp. I'm not sure if they are going to be difficult to find so I would recommend getting a spare set of blades to accompany the machine. And in one of the pictures that accompanies this review it shows the two blades almost rubbing together there is a quarter of an inch space between the blades so as long as your shaft doesn't get bent you should not have any problems with this but you will need to get the exact size blades for replacement to keep this quarter inch gap. Again the batteries are standard batteries and seem to be pretty decent. It does come with a 4 amp hour and a 2 amp hour battery and will automatically switch over when one battery is depleted. Although I do recommend placing one on a charge and the other in the machine therefore when one battery goes dead you will have a spare battery that is fully charged. It does have a great feature with one handle raising and lowering the height of the wheels. This is so simple and very easy to do unlike classic mowers which you usually had to do each individual wheel and sometimes struggled with it. This actually does all four wheels at once. Now when I tried out this for the first time in my yard I was very skeptical I didn't think it was going to do a good job but I decided to give it a go anyway instead of sending it back at first look at the undercarriage it looked very cheap and not well made but again I decided to take a chance on it. This cut through wet morning grass like a hot knife through butter I am so impressed with this mower it actually cut fantastic shaved about 15 minutes off of my normal cut time and was just light as a feather going through the grass. It was not loud at all in fact my dog usually runs from loud noises and he didn't even budge. To be honest my shop-vac is 10 times louder than this is. I will post a decibel rating as soon as I have another person to hold the machine in the on position. Once I was done with my lawn which is rather small less than a quarter acre. I noticed that the 4 amp hour battery had only gone down one bar. I had been out there using it for approximately 15 to 20 minutes in wet, thick grass. Now to get an idea of runtime I am guesstimating that in ideal conditions normal grass height, not foot long weeds, and dryer grass not wet. This should get approximately 45 minutes to 50 minutes of use on one 4 amp hour battery. What I do recommend is that if you are using this on a larger lawn I would highly suggest getting at least one more 4 amp hour battery. Anything more than one acre of land I will not recommend this for as it would be too much for this mower I believe to successfully handle. But for standard lawns approximately a half an acre or less I really do believe that this mower would be fantastic for you. I like to keep my lawn a little bit longer than most lawns in my neighborhood so that it will remain nice lush and green in the hotter months. Just so it will prevent drying out . Okay now on to the pros and cons.Pros1. Is very lightweight2. Mulches better than most3 bag has a indicator indicating when it is full and when you should empty it.4. Batteries seem to last a good amount of time and has dual batteries with an automatic switch over when one battery is depleted.5 wheel height adjustment does all four wheels at once and is very easy to use.6. Has quick lock release clamps so that you can quickly and easily fold up The handle for quick storage.7. 10-in wheels in the rear8. Batteries are cross-compatible with most all green works 40 volt tools.9. Comes with two batteries and charger10. Cheaper price than most electric mowers on the market.Cons1 cost to replace the battery is on the expensive side right now approximately $150.2 blades seem rather small and could be very difficult to find replacements for at a later date.3 ABS plastic deck seems rather lightweight and could present problems if you were to accidentally run over larger sticks or larger debris and may not hold up.4 quick release clamps if over tightened could potentially break if you're not careful and don't understand how to adjust it.5. Documentation is not very well written and does require a little bit of common sense to read between the lines. It does not indicate how long the batteries take to charge.My overall opinion of this mower is that it is definitely well worth the investment and is comparable to some of the big name electric mowers on the market currently.I will update this review from time to time as months go on. The only reason I did not get this a full five-star review is that there is always room for improvement for example instead of having an ABS deck maybe make a tempered aluminum deck.Update. The decibel level from standing directly behind the machine is 72.2Basically, the equivalent of a shower or toilet flush. Slightly less than a vacuum cleaner.
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Top reviews from the United States

  • Reviewed in the United States on February 23, 2015
    Size: 40V 20" (4.0Ah + 2.0Ah)Verified Purchase
    When I was younger, it often fell to me to mow my parents’ lawn (or one of their parent's lawn, or their parent's other kid's lawns). When I bought a house of my own, what I remembered most about mowing lawns was the maintenance schedules of the gas powered beasties everyone owned and the special tricks needed to get them to start and keep them running. Some relatives had newer, high powered yard demons that could shave the green stuff with gusto and some had old decrepit things with rusted decks that had to rest and cool down with great frequency, but every one of them was a hassle in its own right. By the time I got fresh gasoline and mixed it with oil and put that murky mess into the tank (and cleaned up the inevitable spills) and got the thing started and actually mowed the lawn, half the darned day would be gone in the service of maintaining some stupid grass.

    Once I had my own lawn to maintain, the bloom had come off the rose, so to speak. I knew I didn't want a liquid fueled maintenance hog and that's about all I knew. I didn't shop for options to gasoline because I wanted to leave a pristine world for the kids or save the whales; I just didn't want to dink with gas powered tools anymore. At first, I bought a reel mower; honestly, I don't know what I was thinking... any fool can see those things take a lot of work. I tried using that reel mower for about a month before I realized that in its own way, it presented even greater maintenance and upkeep challenges than my old man's rock throwing rust bucket. So I fired up Amazon, read a bunch of reviews and pulled the trigger on a cordless Black & Decker mower.

    That first cordless mower worked a lot better than the manual reel mower it replaced, but it presented its own challenges: for one thing, it was heavy. The second problem was the charge on the battery would only last for about half my front yard before giving up the ghost and took almost an entire day to recharge. I considered buying a second battery and swapping them out, but getting to the battery was a study in inconvenience and I didn’t want to operate the mower with the battery exposed. So now, it took the entire weekend to mow my front yard. If pushing that mower had been less demanding, I might have just gone ahead with the exposed replacement battery plan, but I was usually beat after lugging that thing half way around the yard. I continued using that mower for about a year, mostly because I couldn’t justify getting a replacement so soon after buying that one. In the meantime, I started doing the research to see if there was a better cordless option.

    Right around this time, I started wondering if maybe gas wasn’t the way to go after all, but the prices of a good gas mower coupled with seeing the trials my neighbors were going through with their own fire-breathing labor savers kept me in the hunt for electrics. There were a couple of cordless options around that time, but the pricing just seemed insane, so I settled on a well-reviewed Black & Decker corded model (MM275).

    I used that corded model for several years. I’d already had a good long extension cord on an easy to use reel (Quick Winder RAP-100), so it was just a matter of learning not to run over that cord. This is harder than it sounds, especially when you factor in the trees. I learned to plan my turns and my runs to ensure the cord would not be in my way and would provide enough slack to get to the end of a run before renegotiating cord positioning. Sometimes, I misjudged this and stumbled over my own power source, but I stuck with it and I’d have to say... this was a pretty good mower. As the seasons turned, though, I’d begin cutting my lawn later and later each Spring and less and less often through the year until, finally, I’d mow the lawn only when it was atrociously tall and more than a bit of an eyesore. I knew I had to do something, but I still didn’t want to buy a dino-burner and the thought of cord-dancing had become a genuine deterrent. That’s when I started looking again and became intrigued by the GreenWorks 25302 package.

    The pricing was a bit formidable, but I’d begun using an Instant Pot for most of my meals a few months previously and found my bank account had swollen apace, so I assembled my justifications and bought the mower set along with a spare set of blades. My intention with the extra blades was to sharpen them and replace the factory originals, then sharpen those and have a spare set to drop in whenever I’d caught a rock or whatever. Unfortunately, the spare set of blades came as two “Blade II” blades, instead of one each “Blade I” and “Blade II”. Happily, I’d bought them from Amazon, whose return policies are pretty awesome. So I pulled the original blades and sharpened and re-installed them before running the green machine through its maiden voyage.

    Several weeks (months?) of neglect had put weed patches the size of small shrubs across my yard. There were isolated thistles towering over mounds of something that looked like mutant clover clumps and the grass itself was thick, hearty and used to getting its own way. I started out with just the larger battery slotted and the mower at full height when I hacked down the first and worst weed tangle. I was pleasantly surprised by how easily the mower could be maneuvered and how little effort it took to push. After chopping through that first thicket, I dropped the height of the deck to the halfway point and got down to the business of dominating the flora.

    To cut a long story not exactly short, this mower kicked chlorophyll. My ¼ acre front lot is now of uniform height and it only took the one battery to make that happen. As if that weren't enough, the whole process took less than 30 minutes. Up and back I went, up and back, rinse and repeat until the tall stuff was all gone. I was initially thinking I might, at a later date, also get the GreenWorks weed trimmer with a battery and charger of its own which would save me several bucks over buying the battery and charger separately, but now I wonder why I’d need a third battery at all. Given the fast charging times and the miserly power sipping of this machine, I wonder if I won’t wear myself out before challenging both batteries.
    40 people found this helpful
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  • Reviewed in the United States on May 5, 2014
    Size: 40V 20" (4.0Ah + 2.0Ah)Verified Purchase
    UPDATE AFTER 9 YEARS: I bought this electric mower back in 2014. Now, in 2023, it's still going strong. Best lawn equipment purchase I ever made. So much quieter than my gas mower. No smelly fumes. Don't have to worry about storing or running out of gas. Don't have to change the oil. In fact, at the end of the season, I don't have to do anything except put it away. It's not self propelled, but the mower is so lightweight I don't even notice. In fact, when the grass isn't tall, I can push it at a pace faster than my old self-propelled gas mower. Remarkably the batteries are still going strong after nine years. Gas-powered lawn equipment pollutes worse than cars, but even if I didn't care at all about air quality I'd still recommend this mower because of how quiet and maintenance-free it is. Never going back to gas.

    Purchasing this Greenworks mower was a leap of faith for me. I have a very large (~10,000 sf) and somewhat hilly lawn, and for the past 15 years I've used a big, twin-bladed, 33" cutting path, 10.5 hp, self-propelled, four-speed, semi-pro Craftsman lawnmower. It was fast (I could do the whole yard in 40 minutes), but it was loud and required all the usual small-engine maintenance.

    I just mowed the lawn for the first time using the Greenworks battery-powered mower and I couldn't be happier. [Update September 12: I've now used the mower for a full season, May-September. After four and half months, I still love this mower.] I expected it to take much longer, because of the narrower cutting path, but it went faster than I expected because the mower is so light and maneuverable that I wasted less time doing turns. I was worried about it not being self-propelled, but again the light weight of the mower really made a difference. It was more of a workout that walking behind the Craftsman self-propelled mower, but not bad at all. I'd liken it to pushing a high-wheeled stroller with an infant on board.

    On this first pass, I took off the bag and used the mower in mulching mode. It worked very effectively, including on the occasional pine cone. My grass is mostly fescue, which is fairly thin, and the mower cut it easily and evenly. In a couple of thicker patches the electric engine rev'd up automatically and handled the denser turf just fine.

    Starting the mower is very simple -- push one button and pull back the lever. Much more convenient than starting my old lawnmower with its pull cord. One delightful (and unexpected) advantage is that the mower is much quieter than my old gas mower. I always used to wear ear protection when mowing, but didn't need to with this electric mower. My family reported that it was also much, much quieter inside the house.

    One thing I'm looking forward to is the lack of maintenance and not having to prep the mower for winter storage, or change the oil, or store gas.

    I can charge the batteries from our solar panels, which makes this a very green solution. I was surprised to learn recently that small gas-powered engines in lawn equipment are very dirty compared to modern cars, so this small change of mower makes a big difference in terms of my environmental footprint.

    The mower comes with two batteries, a 4ah and 2 ah. Both can be installed at the same time, and the mower automatically switches to the second battery when the first runs out. Unfortunately, the combination was not enough to finish my lawn. I wish there were an option of buying two 4ah batteries when purchasing the mower. A second 4ah battery is pretty expensive, but because Greenworks prices its bundles (i.e., piece of equipment together with a battery and charger) pretty aggressively relative to the cost of batteries alone, you can get a spare battery at fairly low marginal cost if you buy multiple Greenworks products. As it turned out, I also wanted a cordless electric leafblower, so I ordered a Greenworks leafblower plus battery and I now have three interchangeable batteries, which is enough for my lawn.

    Bottom line: This mower cuts smoothly and evenly, mulches well, does an average to large lawn on one charge, is light enough to push without needing to be self propelled, is much quieter than a gas mower, needs less maintenance than gas-powered small engines, and is seriously green (especially if you have solar panels like we do). For me, it makes mowing a lot more fun (or at least a lot less of a chore). Two thumbs up.

    Update May 5: I ordered this mower through Amazon. I ordered some additional items directly from Greenworks website. One of the packages arrived, but another got lost in transit. I emailed Greenworks over the weekend and received a reply first thing this morning that they would ship a replacement same day. The replacement arrived a couple days later. Couldn't ask for a faster or more complete resolution. So, in addition to really liking the product, I'm also impressed by the responsiveness of their customer service. I hope this company does well.
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  • Angélica Gutiérrez Ortega
    5.0 out of 5 stars Fácil de usar
    Reviewed in Mexico on June 18, 2019
    Size: 40V 20" (4.0Ah + 2.0Ah)Verified Purchase
    Excelente producto y súper fácil de usar y limpiar.
  • Jack Wong
    2.0 out of 5 stars Missing parts
    Reviewed in Canada on December 2, 2019
    Size: 40V 20" (4.0Ah + 2.0Ah)Verified Purchase
    This product is decent.

    The big issue I had was missing parts, which makes the handle not grip strongly to the body, which makes it very hard to push. After opening and installing this machine, I was too exhausted to return it. So I've been using tons of plastic straps to strengthen it. It looks ugly now, but at least I can push a bit better.
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