Model: #RY40LM10-Y

4.1 | 146 Reviews
  • SMART TREK Self-Propelled Technology Adapts to Walking Speed
  • Features 21 Inch Durable Steel Deck
  • Rear-Wheel Drive for Increased Traction

Brushless Motor and 6.0 Ah Battery for Maximum Power and Runtime


Ryobi five year warranty
*Tool Warranty

All RYOBI 40V tools are covered by a 5-year limited warranty.

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* Battery Warranty

All RYOBI batteries are covered by a 3-year warranty.

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Cutting Height
1.5" - 4"
Deck Size
79.2 lbs.


40V 4.0 Ah
Deck Height Adjustments
7 Positions
Mowing Function
Mulching and Bagging Capable
Recommended Yard Size
1/4 - 1/2 Acre


5 Year Tool Warranty 3 Year Battery Warranty



40V 21" BRUSHLESS SMART TREK™ Self-Propelled Mower WITH 6AH BATTERY & CHARGER is rated 4.1 out of 5 by 141.
Rated 4 out of 5 by from Just got it! 87 year old owner This mower was very easy to prepare for mowing. Just read the instructions, charged the battery, 3 hours plus, inserted the battery and key and mowed my lawn. It did a good job of cutting the grass. The battery lasted for the entire job with one bar left, 35 minuets. I have one complaint so far. The handle used to control the mower is too wide. It is wider than the mower deck and therefore you can not mow close to the edge of a fence, house or whatever. In my mind it is a glaring design flaw that I don't believe is a problem with other Ryobi battery powered mowers. If Ryobi plans to continue selling this mower it need to redesign the handle to get it inside the mower deck.
Date published: 2020-07-16
Rated 4 out of 5 by from Easy to use. Battery has issues I purchased this last week and was able to use it (finally) this weekend. Easy to use and start, but a fully extended handle wasn't as ergonomic as I expected it should be. The battery was fully charged prior to starting, but it only lasted 25 minutes, hardly enough to cut anywhere near 1/2 acre as advertised. I'm hoping the battery needs a break-in period. I've ordered a 2nd battery (due to the property size), but if more than that are needed, it's poor advertising on Ryobi's part.
Date published: 2019-05-11
Rated 4 out of 5 by from Great Mower, Battery lacks the run time. I have an old Craftsman gasser that has been struggling and when I saw this mower coming out, I was really excited to replace my old one with it. The new Ryobi cuts really well and is super easy to manuever around my yard.the handle is more comfortable and the ease of use is way above older mowers that I have owned. The only issue I have is the battery doesn't always make it through an entire cutting (0.20 acres) . I try to cut twice a week and if the grass isn't too long, I can usually get a complete cut off of one charge.
Date published: 2019-06-22
Rated 5 out of 5 by from First impression In the 90s my first battery powered drill was a Ryobi, and it ran and ran for years. I also have a Ryobi corded jigsaw that has lasted for a couple decades. I picked up this 40v mower, because my Honda gas powered mower finally was getting to be more of a pain to fix. So, figured for my small yard I'd give this mower a try. Overall, on the first mow I'm liking it. The mower folds up nice and compact for storage, but also with a simple switch you're ready for work. It starts easily, and moves easily. My first mow went very well, and was far better than expected for a battery mower. We'll see how it does over the long haul, but so far looks promising.
Date published: 2021-03-28
Rated 5 out of 5 by from Easy Use For Small Yards, Great Power I bought this a month ago and have used it every weekend on a 0.3ac lawn. I have St. Augustine grass in central FL, and it cuts great lines and powers through. If grass is very thick or wet, you have to take it slower, make slightly smaller cuts, or bag it so it does not slow the blade. Although, in general the torque is great with the 40V. The single 6Ah battery will last (barely) with the self propelled engaged. I have extra batteries, so never a problem. Thick or wet grass will greatly reduce battery life. I have a steeper backyard area and ditch in the front, and the self propelled rolls right though. No oil or gas which makes it easy. Just remember to charge the battery. Will be interested to see how everything holds up after a year or two, but seems like a quality product.
Date published: 2019-07-01
Rated 4 out of 5 by from So far, so good I just bought the 21” self-propelled mower and have only used it once so far but I think I like it. It has both pros & cons. I like how light and how quiet it is compared to my old gas-powered unit. And not having to deal with gas is a HUGE plus. What I didn’t like about it was the 6ah battery wasn’t enough to do my whole lawn, (despite it being brand new). So that was a bummer. The other thing I disliked was the delay between engaging the self-propel and when the machine would actually start to move forward. That will definitely take some getting used to. Overall I think i’m happy with it...but I also wasn’t blown away either. Not for the price tag.
Date published: 2021-05-31
Rated 3 out of 5 by from Self Propel Won't Disengage Love everything about the mower except mine has an issue where the self propel will not disengage. As soon as I squeeze the handle it starts going and I can't get it to stop. Tried the button, moving the handles and everything. This runs the battery down quick too.
Date published: 2019-07-13
Rated 5 out of 5 by from Self propel feature is cool Just got it today. Very powerful compared to my old gas mower. The self propel feature is unique. There is no lever to pull; it reacts to the pressure when handle bar is in unlocked position. This makes it easy to stop and change directions or to go backwards without having to stop self propel mode. I have 8500 sq ft yard, it went all the way with the 6.0 amp hour battery. Great job Ryobi, now Ego has a contender.
Date published: 2019-04-02
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