Greenworks 40V 21" Brushless Cordless (Self-Propelled) Lawn Mower (75+ Compatible Tools), 5.0Ah Battery and Charger Included

I snagged this Greenworks 21" self-propelled electric lawn mower during a Prime Day deal, despite some mixed reviews. As a long-time Greenworks user with their edger and blower, I was confident in the brand and already owned several compatible batteries. The advertised 45-minute runtime seemed optimistic, but I wasn’t concerned. In my test, the included 5Ah battery lasted just under 25 minutes, which I expected given the heavy load—cutting thick, damp St. Augustine grass while using the self-propel feature nonstop. Battery life clearly depends on the motor’s workload, and this was a demanding test. UPDATE: I've cut my lawn two more times with continuing good results. The most recent time I did not use the self-propel feature at all and got about 36 minutes on the battery. It was still showing one of the four charge lights illuminated so I don't how much longer it would have operated. This mower is a worthy successor to my aging Lawn Boy 21" self-propelled mower. Unpacking and setup were straightforward, and I was impressed by the mower’s sturdy, well-built construction—solid and durable. The variable-speed transmission is a standout feature, intuitive to adjust and responsive. Starting the mower is effortless, and the self-propel engagement mirrors my old Lawn Boy: release the bar for about half a second, and the wheels free up for easy backward pulling. The large rear wheels also further enhance maneuverability and make it easy to push without engaging The self-propel feature. The single-lever height adjustment is simple and convenient, making quick changes a breeze. Cutting performance was excellent, even through heavy, wet St. Augustine grass. The mower powered through with minimal clumping, and the side discharge chute worked cleanly—a strong showing for such challenging damp conditions. Overall, this Greenworks mower is a powerful, user-friendly, and well-constructed machine. As a replacement for my old gas mower, it’s a clear upgrade. No regrets so far—highly recommended for anyone looking for a reliable electric option!

My old Black and Decker mower made it 14 years and batteries since and now are 1/4th the size. I went from a huge heavy car battery mower to a tiny single battery. How does this Greenworks 21" mower with a single 40v battery fare? It just mowed my entire lawn with ease using the entire charge. I'm not sure how long it took, but maybe 30-40 minutes. My old B&D used to do that when it was new, but over time it could only do half. This mower was just as strong cutting the lawn, had an easy height adjustment, and the self propelled worked great going up a steep incline I have as well. Zero complaints. This mower was also half the cost of the old B&D when I bought it. Now to see if this one can last 14 years! Fingers crossed. Edit: I've done several mowings since I've bought this and it's still fantastic. It goes through heavy grass pretty easily, and it has a slot for a spare battery as well. For the cost, this thing is just amazing. My lawn is on the smaller side and takes about 30 mins tops to do, so I can do everything in a single charge. Barely. I did buy two cheaper spares and even though they advertised being larger capacity than the brand name one, they only lasted about 2/3 as long. I'm not complaining because they're really really cheap and pretty light all things considered. You could buy 10 of these things for the cost of a replacement battery for my old B&D.

The mower is great. The battery that came with it was joke. Died ridiculously quickly when fully charged, and that was without using the self propel. I bought a longer lasting one that fixed the problem that was another couple hundred dollars. So, plan on adding a couple hundred dollars to your cost

I have only used my new mower one time but WOW! i am a 69 year old woman and was looking for a light mower. i was initially upset it wasn't 21 pounds (almost returned it) but it is still feels pretty light and handles easily. it cuts like a charm with one pass. i was able to do my lawn in about 15 minutes! (previously would take me 40 minutes with old mower repeating areas to get all the grass cut) so the power level was very satisfactory and the blades did the job the first time. i was giddy at how great it mowed! not wanting to stop i then did the side yard (about as big as the front yard, and then a little out front by our field and still had 2 dots left on my battery. i used it totally about 35 minutes and didn't even break a sweat. our lawn is on a hill side and only needed the self propel when i was going uphill. i only had it on the second lowest self propel level and it took me uphill like a charm. and as someone else said... be sure to let go of the self propel handle when making a turn on the back wheels or it will take you for a ride!! i did not need the self propel to go sideways or downhill. without the self propel on you can mow backwards also and just lift the front and and place it down into small areas and it cuts great that way also. and i did not have to repeat areas to get the cut nice like my previous mower which admittedly was a battery powered self propelled reel mower . best yet - the grass looks fantastic.

I bought this mower in July of 2025 and had extremely high hopes. This is the only electric mower we've ever owned and after comparing reviews to others on the market, I thought we were going with one of the best available. I was wrong. The marketing advertises 1 battery should last up to 45 minutes. Being realistic, I was going to be happy to get 30-40 minutes out of it. Our yard takes roughly 1.5 hours to mow completely. Given the advertisement of battery life, I bought a 2nd battery with the idea of completing the whole yard between the 2 if it lived up to the advertisement, or just over 2/3 with my more realistic expectations. Right from the 1st mow, my expectations dipped. We originally got 20-25 minutes per battery right out the gate. While not fantastic, I was willing to deal with it. Sure I'd have to fully charge both batteries an additional time to complete the whole yard, but it wasnt the end of the world. We probably used the mower a half a dozen times to get through the rest of the 2025 mowing season from the tome we bought this product. Fast forward to the 2026 season. We started mowing our lawn again in April and, right away, the battery life had changed drastically. We were lucky to get 30 minutes between both batteries in our initial mow, with each additional mow resulting in diminishing returns. As of this posting, I arrived home from work today at 4:40p and began mowing my lawn at 4:45p. As of 5:06p, I started writing this review on my couch, as both batteries are back on the charging dock. In less than a year and a dozen mows, we've gone from 40-50 minutes of battery life between 2 batteries, to 20 minutes. Perhaps we received bad batteries, I dont know. What I do know is to recommend everyone avoiding this product based off our experience thus far. If the company reads this and is willing to try and rectify our experience, I'm open to give them another shot, but I'm not holding my breath either. We were really excited about getting away from the gas mower. Not rely on gas anymore. Be more eco friendly. Now I'm wishing we never made the change.

This is the best mower I have ever owned. I started using battery operated mowers a few years ago for the convenience of winter storage. My lawns were small and I did not need a lot of mower. My new home has a much larger yard with a lot of uneven ground and even some extensive grades. My wife talked me into getting a self-propelled mower, which was a great idea. I figured it would drain the batteries too quickly, but that is not the case. The cut on this mower is amazing. It is the most even and complete cut I've ever gotten from any kind of more. I highly recommend this mower. If you have a fairly large yard, I would recommend that you have a minimum of two batteries but you will probably need three to four. I have four but typically use only three. I do not use the self-propelled all the time, but only when needed.

Pros: Quiet, easy start up, no maintenance, self-propelled multitude of options for bagging, mulching or side discharge. Cons: Battery life is mediocre, power can be lacking and sometimes inconsistent. Thick grass, not even tall grass can be a challenge for it. This is my first foray into battery powered mowers. Knowing what I know now, I should have invested in the 60 or 80v line. The mower itself is awesome. Build quality is great, it's a fraction of the weight of a similar gas powered mower. Under normal conditions, where the grass isn't super tall or thick, this would be a great mower. But, we had a wet spring and summer and that made it challenging and frustrating at times trying to cut grass. It tended to be underpowered most of the time. It just couldn't handle the load and stalled out quite often. And at a times, to keep it cutting, I've had to open the rear discharge chute and side chute to keep it from getting bogged down. Once I did that, it usually cut just fine, but I would end up covered in clippings. The other thing I'm noticing, is that it doesn't generate enough blade speed under light loads to adequately discharge the clippings out the side chute and it'd clog up and eventually bog down under load. This would cause it to increase RPM, and decrease battery life. It really should have a high lift blade, but again, it would decrease battery life. My lot is less than .1 acre of mowable grass. There's been times where I've needed to use a 3rd battery to finish. If I'd have known, I would have bought the 60v or 80v mowerim not sure what I'll do with this one. I may try to sell it and recoup some funds and upgrade to one of the other lines. Battery powered mowers require more thought to go into them than gas mowers, you have to understand the type of grass you have, and be realistic about how often you're going to cut it. Gas mowers generally have enough power to get through most yards with no problem, unless you're running a small 130cc mower. But, in terms of battery powered stuff, it seems you definitely want to go bigger than you think you need to, it's better to have the extra power on tap.

My first ever cordless electric mower. At first I thought it was a dud. It's really confusing how to turn on, why can't it just be a switch or button? The manual was lawyer speak so it was very unhelpful on how to turn on. DON'T USE PROFESSIONAL WORDING- speak like I'm a moron, cause i am. Then the first use- the battery only lasted 10 minutes on a full charge- kept stalling out during this too, thought it was a bad battery. But 2nd charge it went more like 20 minutes and ran solid. I got a 3rd party 6000mah battery for it, that worked great with it too, now I can mow for almost an hour of pure chaos! Overall i am happy with it, though I kinda wish I had gone for the 80v model for more power. Don't be lazy about mowing and you'll be okay, seriously just don't let that grass get too tall or you'll wish you had the 80v version too. Oh and... even on highest height setting... thing thing cuts extremly low to the ground. Like... almost putting green low. I've never seen that on a gas powered mower... is this how all electric mowers are? It's nice looking results, but I do nick a few more rocks.