40V HP 21" Brushless Walk Behind Push Mower with 40V 7.5Ah Battery and Charger

Model: #RY401200

4.6 | 34 Reviews
See The Entire 40V HP Lineup!
RYOBI redefines power and convenience with the 40-Volt HP 21 in. Push Cordless Lawn Mower. The premium HP brushless motor provides more power, longer runtime, and a longer motor life. It starts with just a push of a button, without the hassle of gas, oil, or maintenance. This mower is ideal for yards up to 1/2 acre, featuring dual active battery ports and a 40-Volt 7.5Ah battery that provide up to 50-minutes of runtime. The 21 in. durable polypropylene deck is lightweight, resists corrosion, and is covered by a lifetime warranty. The mower has a 10 in. high wheel design and the deck features 7 position single point height adjustment to easily select your grass height between 1.5 in. and 4 in. With the 3-in-1 mowing functions you can choose between bagging, mulching, or side discharge functions. The easy lift single motion bag removal allows you to quickly and easily empty the grass catcher bag and get back to work. When the job is done, the 1 touch aluminum handles fold for compact, vertical storage. This mower includes a 40-Volt rapid charger, which charges your RYOBI 40-Volt batteries 4X faster than the standard charger. The RYOBI 40-Volt HP 21 in. Push Lawn Mower, batteries, and rapid charger are all compatible with 50 plus RYOBI 40-Volt products. This mower is proudly made in the USA with global materials and is backed by a 5-Year Tool Warranty.


Ryobi five year warranty
*Tool Warranty

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

View our current promotions for new product releases and the latest RYOBI savings!

Ryobi Help+

Your one stop destination for tips & techniques, manuals, troubleshooting, FAQs and more!


  • Cutting Height: 1.5" - 4"
  • Deck Size: 21"
  • Weight: 63.5 lbs
  • Battery: 40V 7.5 Ah Battery
  • Mowing Function: Mulching, Bagging, or Side Discharge
  • Recommended Yard Size: 1/4 to 1/2 Acre
  • Deck Height Adjustments: 7-Position Single Point
  • Estimated Runtime: Up to 50 mins.
  • Warranty: 5 year tool warranty and 3 year battery warranty


  • 40V HP 21" Push Mower
  • 40V 7.5Ah Battery
  • Rapid Charger


40V HP 21" Brushless Walk Behind Push Mower with 40V 7.5Ah Battery and Charger
40V HP 21" Brushless Walk Behind Push Mower with 40V 7.5Ah Battery and Charger is rated 4.5 out of 5 by 29.
Rated 3 out of 5 by from Somewhat of a Letdown I bought this mower about six weeks ago. We have several battery powered yard tools and have been very pleased with them. I think this is better suited for a yard no larger than .25 acre. Our yard is about .6 acre and we've had to purchase two additional batteries just to be able to cut the entire yard. As a rule, I don't use the self-propelled feature much at all since it uses more battery power. I've also had an issue with the mower cutting off while cutting when the battery is still charged. I do like that the mower is quiet and that it doesn't use gas. One of my favorite features is how easy it is to fold up and store.
Date published: 2021-06-30
Rated 5 out of 5 by from Great Purchase I have been enjoying this product for 2 months and it has been performing well without exhaust fumes or gasoline. It has performs well in heavy grass and holds charge better than I expected. Great on mulching and side discharge. When bagging, it does not pack the grass in the bag quite as well as a gas powered mower, but still gives an even cut. It just requires emptying the bag a bit more often. Led lights turn on automatically when daylight fades - lighting the way when finishing late. I am really pleased with this product. A battery was offered in exchange for this review but I would have said the same things without the incentive. This product has worked very well for me and the batteries charge in reasonable amount of time.
Date published: 2021-10-19
Rated 5 out of 5 by from Beat mower to date !! Was very cautions of any type of power tools or equipment, but man was I wrong , Beautiful cut. Light and easy to.manuver on slopes , and the sound level is nonexistent,
Date published: 2021-07-02
Rated 5 out of 5 by from Great tools for older people One of the things I really enjoy about the Ryobi battery operated tools are the ease of use. I recently purchased the 40V Lawnmower and the push button to start has been a blessing. As I started to have back issues I often struggles to start my gas mower but my new ryobi lawnmower has truly improved my life!
Date published: 2021-08-27
Rated 5 out of 5 by from This Grandma LOVES her Ryobi 40 V Hp Lawn Mower! We have this huge back yard with wilderness exposure on the South side. I used to dread having to cut the grass with that old gas mower. With my old gas mower, my shoulders used to get so sore. My brand new Ryobi is the best mower we ever bought. It steers much easier than any gas mower I ever used and is also self-propelled. Now, I just push a button to start my Ryobi 40V. I easily lowered the grass cut level with the lever, then I custom fit the handle to perfectly match my height and reach. It has just as much power and the easy drop in rechargeable battery means I don't have to deal with expensive gas, oil, plugs, and all that time-wasting maintenance. Those frustrating hassles are history! Our grandchildren love to play in our back yard, this mower helped me to cut it with ease and enjoy cutting grass again. Thank You Ryobi!
Date published: 2021-10-17
Rated 5 out of 5 by from So much awesomeness!!! I bought this a few months back while the grass was still growing on the regular and let me just say, it's one of the best Ryobi purchases I've made thus far! Never having to change or full with any kind of fluids or spark plugs, and BAM...it starts with one push of a button EVERY.Single.Time!
Date published: 2021-11-04
Rated 5 out of 5 by from Awesome power and design I have used one of the smaller Ryobi mowers and have thought they worked great, but really wanted more power and this one delivered. The 21" along with the HP motor help to get the job done fast and easy. I also love the design of the mower - the fold up feature, ergonomics, ease of access to the bag - all are great and make it fun to use. Great product!
Date published: 2021-06-28
Rated 5 out of 5 by from Great Mower I've had this mower for a few months and have been very pleased with my purchase. It checks all the boxes; plenty of power, good cut quality, enjoyable to use, etc. The ability to store vertically is great, now I don't have to pull any cars from the garage when I cut the grass.
Date published: 2021-11-04
  • y_2021, m_11, d_7, h_19
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.19
  • cp_1, bvpage1
  • co_hasreviews, tv_4, tr_25
  • loc_en_US, sid_316066510, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_ryobioutdoortools