Greenworks 40V Brushless Self Propelled Lawnmower, 21 Inch Electric Lawnmower, 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.