Sun Joe 24V-X2-21LM Review

48-Volt 21-Inch 1100-Watt Max Brushless Cordless Lawn Mower, 7-Position Mowing Height Adjustment w/Rear Collection Bag


Final Score

4.3 / 5 from 2942 users

Sun Joe 24V-X2-21LM | Tools Official
Sun Joe 24V-X2-21LM | Tools Official
Sun Joe 24V-X2-21LM | Tools Official


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We spent 9.2 hours reading reviews from customers and experts. In summary, here's what users think:

13 reasons to buy

  • The Sun Joe 24V-X2-21LM is described as being light and easy to maneuver, with one review specifically noting it weighs 54 pounds. (45 reviews)

    • “It is light weight, easy to assemble, easy to adjust height, easy to charge, batteries have power meter built-in, quiet to operate, easy to maneuver, and on and on...”

    • “It weighs almost nothing and is easy to clean and put away.”

    • “Initial reaction was impressed with how insanely light it is, especially in comparison to my old Honda mowers.”

    • “It's light as a feather, but it cuts like nobody's business.”

    • “it is lightweight but not flimsy”

    • “Very light. The mower is so light I think I've carried heavier lattes.”

    • “Being a single mom I was worried I wouldn't be able to put this thing together by myself or lift it, but this thing is LIGHTWEIGHT! I went to pick up the box (fully expecting this thing to be heavy) and almost threw it into the door. I was NOT expecting it to be that light.”

    • “Mine is not self propelled but is light weight and just as easy to maneuver.”

    • “It's very lightweight! I have a steep front yard and pushing other mowers on it has been exhausting. This one was so easy!”

    • “It is easily maneuverable, I can use one hand for the most part.”

  • Multiple reviews noted that the mower was easy to put together, often within a few minutes and with minimal tools required. (28 reviews)

    • “It was so easy to put together and adjust for me.”

    • “Got the mower today and it took longer to unbox it than it did to assemble. 5 minutes total assembly with 0 tools required.”

    • “It was super easy to put together”

    • “It was so easy to put together that my 8 yr old put it together himself.”

    • “Assembly requires no tools and is a matter of attaching four bolts in the handle and attaching 2 cable clips to retrain the control wire”

    • “The mower was well packaged and easy to assemble.”

    • “This was completely put together minus the top of the handle. Just attached the top and tightened the hand screws and it was ready to go.”

    • “It was easy to assemble. This from someone who breaks into a sweat at the words "tab a into slot b".”

    • “The assembly was super easy with just a few screws to tighten by hand to fix the handle in place and charging the batteries.”

    • “The Sun Joe arrived and was very easy to put together.”

  • The mower operates quietly, allowing users to enjoy a peaceful mowing experience and even hear ambient sounds like birds chirping. (18 reviews)

    • “I was able to still hear the birds chirping from the trees and even my wife from the garden.”

    • “Less noise than a regular lawnmower. Once my neighbors start cutting grass you can’t hear me cutting grass.”

    • “The mower is very quiet and I wasn't sure it was actually cutting with the mulch adapter in place...but it is and it mulches VERY WELL.”

    • “it does a fantastic job, is fairly quiet and is ready to go when I am.”

    • “Quieter than my old mowers.”

    • “This mower is so quiet I can use my earbuds at a normal volume!”

    • “It is way quieter than other mowers out there.”

    • “It's also so quiet you can actually hear things while you mow.”

    • “It’s quieter, and I don’t have to worry about throwing my back out trying to pull a cord.”

  • Starting the mower is straightforward, often described as an instant start without the need for priming or cord-pulling. (14 reviews)

    • “Did a quick test run with the 1/2 charge in the batteries - simple start, all good.”

    • “Instant start up, no priming or cord yanking to get it started.”

    • “I stood up, grabbed the handle and started the mower with ease.”

    • “I remember that with gas mowers you pull in the lever on the handle and after that you pull the starter cord. With these it is the opposite, you push in the button and then pull in the lever and it starts right up.”

    • “So easy to start!!!”

    • “The mower is also very easy to start you just have to press the green button in on the side before bringing the handle down and it's ready to go”

    • “Another YouTube video and I saw that you have to push the starter button in so it locks inside the little triangle then you can pull up on the starting lever and away you go.”

    • “It starts like a champ! No yanking on a starter cord. Just push the button and hold the handle.”

    • “No Pulling Ropes”

    • “These mowers are easy to operate, especially if you need an easy-to-start mower. We love that feature!”

    • “No power settings, just push the on button and go.”

    • “Sun Joe is maintenance free with no electric cords and starts with the push of a button!”

  • The Sun Joe 24V-X2-21LM mower features a 7-position height adjustment that is smooth and easy to use, allowing for precise control over grass length. (13 reviews)

    • “7-position height adjustment. Smooth and easy to use - all wheels with one handle.”

    • “Easy height adjustment.”

    • “the height adjustment works perfectly”

    • “AND It's super easy to change the cutting height! I have to mow the front and back yards at different heights due to protruding tree roots in the back yard, so the ease of this adjustment lever is a big plus for me.”

    • “The four wheel adjustment lever is awesome, I use higher if there's less rain, then you just switch it on again and keep mowing. No stopping to adjust all four wheels, then pulling a rip cord to start again.”

    • “It's very easy to change the mower height. I have tree roots in my front yard and I just stopped the mower and raised the height while I worked around the tree. Stopped and put the height back down when I was ready to go on.”

    • “The height is easier to adjust.”

    • “Single adjustable height is pretty sweet.”

    • “I used three of the height settings which were easy change.”

  • The mower effectively mulches grass, chopping trimmings into very small pieces, and can switch between bagging and mulching modes with ease. (13 reviews)

    • “It mulches the grass perfectly.”

    • “Cut grass to approximately half its height on "mulch mode" - no rear bag or side discharge. The trimmings were chopped up VERY small.”

    • “Didn't realize it when I bought it but it can be both bagged (which I hate) or mulching (which I love, less hassle) with the addition of a single piece(included with purchase) which is already in place upon reception.”

    • “My grass was tall, up to six inches in the tallest areas, still slightly damp from morning dew, and was amazed that in mulching mode, it did very well”

    • “The mower is very quiet and I wasn't sure it was actually cutting with the mulch adapter in place...but it is and it mulches VERY WELL.”

    • “I am surprised that it mulches as well as it does because the blade is straight. (My bigger gas mower had a rippled blade.)”

    • “The tall grass didn't slow the Sun Joe down and the grass was mulched up into very small pieces so I didn't have to empty the bag until I got to the end.”

    • “The grass catcher fills quickly when the grass is thick, but the mulching blade works great without the bag.”

    • “My grass wasn't heavy or long but I did have a lot of unraked leaves. The mower mulched it all perfectly! Woohoo! No more raking.”

    • “First cut of the season, just used the mulcher attachment, and it powered thru all the thick spots my old lawnmower would stall out on.”

  • The motor is reported to be very powerful, cutting through grass smoothly and efficiently. (10 reviews)

    • “The motor seems twice as powerful as my last. Along with the blade it cuts my grass like hit knife through butter.”

    • “The Sun Joe powered thru it, both on the 3rd height setting (front yard) and lowest setting (back yard). I didn't have to walk slower or go over any spots twice, so I'm very impressed with how it cut the grass.”

    • “Surprisingly the mower doesn't bog in tall grass. Obviously, there is a speed controller that supplies more amperage to the motor when its under, RPMs/blade speed actually increases in tall grass”

    • “It cuts well, even in the thicker patches that would bog down my ICE mower.”

    • “Even ramps up power when you're in thicker grass.”

    • “This thing is a champ. I bought it later in the spring than was ideal, and my lawn is already too tall, and it will cut through it no problem!”

    • “What I was impressed with was the mower's ability to cut through my intensely overgrown lawn.”

    • “This mower has the 800 watt brushless motor, and it was great.”

    • “Although, I neglected my lawn for two weeks, this mower powered through the tall grass as expected.”

    • “To my surprise it cut through the tall grass without any problems.”

  • Users noted the mower's performance on different terrains including hills and semi-rough areas. (6 reviews)

    • “I use this around fence lines, up hills, and in hard to get places.”

    • “Should have no problem mowing my relatively small but very hilly yard”

    • “It is heavier than I expected, so I do have trouble dragging it up my hills, and mowing up the hill is impossible for me. It can handle a lot of thick weeds and higher grass by lifting up the front wheels, that way it doesn't shut itself off.”

    • “And my slopes are nice and even since the lightweight design allows me to slowly run the mower over the grass instead of jerking like with a heavier mower.”

    • “The front yard isn't flat, the ground critters make it look like a battlefield. And I got tired of using a weedeater on it. This 16", 28 pound mower worked amazingly well on grass that was 6-8 inches high.”

    • “What a difference being able to mow my entire yard including the slope in half an hour without stopping or even breaking a sweat!”

  • The Sun Joe 24V-X2-21LM mower can run for about an hour or more on a full charge with two batteries, and additional batteries can be purchased for extended use. (5 reviews)

    • “I ran it non stop for about 50-52 min with almost no loss in power at the end.”

    • “Also I can get an hour of cutting time with both batteries in plus have enough charge to use one of my batteries in my SunJoe weed eater.”

    • “I brought an extra pair of batteries, my back yard is bigger than it looks but with two sets of batteries I can take my time cutting the grass.”

    • “run time is a little over an hour. For me, that meant I got about 6,000 sq ft mowed, before it died.”

    • “Cut for an hour straight and still had a bar left on each battery.”

  • The mower has foldable handlebars, allowing it to be stored upright and taking up less space. (4 reviews)

    • “The website doesn't say this but if you wanted to you can collapse the handle bars to fold allow you to store the mower in a up right makes it compact for storage.I simply lose the green knobs on the side and it allows the bars it to fold.”

    • “folds and stores nicely”

    • “And lastly, I have a small area to store it in my garage so I loosened the handle and bent it over and it fits like a charm.”

    • “The handle is easier to fold.”

  • The mower has a steel deck, which adds to its durability and gives it a more solid, less 'toy-like' feel. (3 reviews)

    • “Has a steel deck so not as light (54 pounds) as some of the other all-plastic mowers around. But also doesn't feel like a toy.”

    • “the deck is steel and the mower itself feels durable, not like a toy”

    • “The mower deck on my 21" is made of metal and not plastic as some complained”

  • Batteries come with built-in level readers, allowing users to easily check the charge level. (3 reviews)

    • “It is light weight, easy to assemble, easy to adjust height, easy to charge, batteries have power meter built-in, quiet to operate, easy to maneuver, and on and on...”

    • “There's a button to press to show how many dots are green to show how much charged you have left.”

    • “The batteries have built-in level readers so you know how charged it is which is awesome.”

  • The Sun Joe 24V-X2-21LM mower comes with removable batteries that can be charged indoors, which is convenient and can extend the battery life. (2 reviews)

    • “Battery insert/remove pretty simple - just squeeze the clips to remove.”

    • “Batteries can be charged indoor which can extend life of the battery.”

4 reasons not to buy

  • The Sun Joe 24V-X2-21LM's plastic components, including the blade mounting flange and body pieces, are prone to breaking or wearing out over time. (13 reviews)

    • “A plastic body piece broke off the bottom of the mower this week. Everything still works but its about a 3inch by 3 inch chunk of plastic missing from the bottom rear of the mower.”

    • “I pushed down on the bar system the bars popped out of the handle are by way of the plasticky things breaking and sliding around.”

    • “The discharge door on the rear of the mower was chipped and the piece fell out as I unpacked the mower.”

    • “But, the first 2 that I got had broken pieces in them. The first mower had a small broken piece ... The 2nd mower was broken much worse.”

    • “I received this and upon opening the plastic piece around underneath where the batteries go, we’re all broken.”

    • “The only downside for me is the quality/durability of the plastic/material. It looks and feels fragile.”

    • “Soon after getting the unit, I discovered a crack in the green flap that covers the grass bag on this unit.”

  • There is a lack of information and difficulty in obtaining replacement parts such as bolts and blades, with inadequate parts lists and diagrams in the manual. (9 reviews)

    • “Another "bad" is that there is little information about where one can purchase a replacement bolt and blade mounting assembly. The manual inadequately describes the parts needed and how the blade mounting kit goes together.”

    • “Still love the mower, but I've dinged up the blade and would like to get a new one. Can't find one online.”

    • “you may know this as the one that has had no replaceable blades available for several years--and still doesn't.”

    • “I cannot find equivalent spare batteries for this mower in stock anywhere! They are all sold out! The 2 aH ones would technically be compatible, but the life of the 4 aH ones is already short! Sun/Snow Joe has 5.0 aH 24V batteries, too, but those are ALSO all sold out everywhere! The only ways I currently seem to be able to find 4 and 5 aH batteries that will fit this lawn mower are 1) packaged with other Sun/Snow Joe tools that come with them, or 2) through parties that are charging nearly double the MSRP (see vs”

    • “IF Sun Joe Customer Service could've just sent me the part.”

    • “One of the bolts for the handles broke within the first week of owning it. I contacted their customer support and they told me that they were out of that item but they would add me to the list when they get it back in.”

    • “I have to give this mower a very low rating. It arrived with a cracked plastic battery cover. I called warranty and they said that since it was a new model they would not have the part for another month. At the time, I also asked to buy a back up blade and they said that they were not available but would send me one when they had some. I have called three more times over the past three months and they still don’t have the part to replace my battery cover or have a blade. They now say if I send the mower back, they will send another mower. Forget it, I will use glue and duct tape to hold it together. Followup: Still waiting for part. Warranty not backed up. Another followup: Have not heard from company after another month. No replacement part sent. Warranty useless. Certainly, do not pay for extended warranty. Too bad Amazon cannot help. Another followup. Have now waited almost five months to have defective part replaced. I am told that they do not have parts and yet they keep selling the mower on Amazon. I hope Amazon is able to read my correspondence with the company to verify the situation. Further followup: After 5 months my replacement parts arrived so I raised my rating from one to three stars. Don’t understand the delay.”

    • “Since everything else works flawless I will run to the hardware store and get two bolts but am EXTREMELY disappointed in the response.”

    • “However, once they confirmed my part, they informed me that they had neither the part or the mower in their inventory to honor the warranty.”

  • The battery charger is not a rapid charger, taking a considerable amount of time to recharge the batteries fully. (6 reviews)

    • “Only down side is battery charger isn't a rapid charger, takes some time to recharge.”

    • “The con is you'll have to wait two hours to charge it a a downside.”

    • “Batteries were fully charged for the first time in about 20 minutes! (But after a full mow it takes it about an hour and a half to two hours.)”

    • “It does take about 2 hours to fully recharge the completely drained batteries, so plan accordingly.”

    • “The batteries are fully recharged in two hours.”

    • “Batteries needed an overnight charge to mow the first time.”

  • The blade can come off during operation, posing a serious safety risk. Additionally, the manual inadequately describes the parts needed and how the blade mounting kit goes together. (5 reviews)

    • “One thing that the owner should be aware of is that the blade can come off during operation. This poses a serious problem.”

    • “Another con, is you'll have to hand tighten the screw to the blade if your mower stops. That's a trouble shooting tip. I have had the blade come off. I think I ran over something. I am not sure what.”

    • “My only complaint is that the mowing blade was not secure from the factory. It spit out from underneath the mower in season one. The blade went forward and all parts were recovered. However, this could have been traumatic, if the blade flew back towards my ankles.”

    • “The one fairly large drawback I would say ( which is why this is 4 stars and not 5 stars) was that while I was mowing the lawn I noticed an odd sound coming from the blade housing. I used it a bit longer and had to stop the mower before moving to another section of the yard, but thank God I did, because that sound was the blade bolt loosening from the mower. As I turned off the mower the blade came off, along with the screw. I put it back together and tightened it immensely, but I would recommend that before you use the mower, make sure to tighten that bolt.”

    • “Unfortunately, half way thru the second cut, the blade flew off. Put it back together and carried on. Not sure if it wasn't torqued down right or what, just make sure you check ALL of the bolts before using it (will probably end up putting some locktite on the blade bolt).”

Bottom Line

The Sun Joe 24V-X2-21LM is a lightweight, easy-to-assemble lawn mower. Weighing just 54 pounds, it operates quietly and starts instantly without priming or cord-pulling. Its 7-position height adjustment offers precise mowing, and it can mulch or bag grass efficiently. The durable steel deck and foldable handlebars make it easy to store. However, plastic components may wear out, and replacement parts can be hard to find. The battery charger is slow, and the blade can detach during use, posing safety risks.


BrandSun Joe
Cutting Width (in)20 inch
FeaturesElectric Start, Bagging
Max Cutting Height3.5"
Min Cutting Height1.2"
Power SourceBattery
CategoryPush Mowers
Warranty2 Years
Weight54 lbs.

Video Reviews

Special Features

  • Powerful Motor: This lawn mower has a super strong motor called a 1100-watt brushless input motor and a 900-watt brushless output motor, which means it runs cooler and lasts longer.
  • Lightweight Design: It weighs less than 54 lbs and has easy-glide wheels, making it very easy to move around your yard or garden.
  • Wide Mowing Path: With a 20-inch mowing width, you can cut more grass in one go, saving you time and effort.
  • Adjustable Cutting Height: You can change the cutting height between 1.2 inches to 3.5 inches using a 7-position lever, so you get the exact cut you want.
  • Generous Grass Collection: It comes with a big 13.2-gallon bag to collect grass, keeping your lawn clean. There's also a window that shows when the bag is full.
  • Long-lasting Battery System: Powered by the IONMAX 24-Volt System, it includes two strong 4.0 Ah batteries that give you up to 25 minutes of cutting time.
  • Eco-friendly Operation: This mower has zero carbon emissions thanks to its lithium-ion battery system, making it better for the environment.
  • Quick Charging: The dual-port charger can power up both batteries in under 2 hours, so you spend less time waiting and more time mowing.
  • Durable Cutting Blade: The steel blade cuts grass evenly every time, making your lawn look great.


  • Q:

    What is the runtime of this mower?

  • A:

    The mower can last up to approximately 50 minutes on a single charge. The maximum runtime of 65 minutes may vary based on usage conditions.

  • Q:

    What is the cutting width of this mower?

  • A:

    The cutting width of the mower is 17 inches.

  • Q:

    Does this mower use both batteries simultaneously or is one for storage?

  • A:

    Both batteries are used simultaneously when operating the mower.

  • Q:

    Are the batteries included with the mower?

  • A:

    Yes, the batteries are included with the mower.

  • Q:

    How can the mulching plug be removed?

  • A:

    To remove the mulching plug, pinch the hidden clip at the base and pull up and out. This procedure is not detailed in the instructions.

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