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Internet # 317845502

Model # RY401210

Store SKU # 1006779395

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40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger

$989.01
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  • 40V HP Technology Delivers More Power Than a 170cc Gas Lawn Mower
  • Ideal for Mowing 3/4 Acre With up to 70 Min. Runtime
  • Over 85 RYOBI 40V Products – All Work With Any RYOBI 40V Battery
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Product Details

About This Product

The RYOBI 40V HP Brushless 21" Self-Propelled All-Wheel Drive Multi-Blade Mower delivers more power than a 170cc gas mower, making it a true gas replacement. It's ideal for up to ¾ acre with dual active battery ports and runs for up to 70 minutes with the included (2) 40V 6Ah batteries. Experience the industry's best 3-in-1 cutting performance with the CROSS CUT Multi-Blade System. This allows for less clumping when mulching, further & more even dispersal when side discharging, and when bagging the fine clippings fill from back to front to maximize space for less bag changes. The brushless motor and advanced electronics automatically react to mowing conditions by increasing the blade speed to eliminate bogging down and powering through the toughest cut. As part of WHISPER SERIES, this mower is 85% quieter than gas, and even quieter than other cordless mowers, allowing you to mow at any time of day. The all-wheel drive system gives you ultimate maneuverability and control in any terrain by providing full power to all four wheels, while SMART TREK self-propelled technology allows you to easily adapt the mower's speed to your pace for less fatigue. When the job is done, the handles quickly and easily collapse for compact, vertical storage. Best of all, it is part of the 40V System - any 40V battery works with any 40V product. This 40V HP Brushless 21" AWD Mower is backed by the 5-year manufacturer's tool warranty and 3-year manufacturer's battery warranty.

Highlights

  • 40V HP technology delivers more power than a 170cc gas mower, making it a true gas replacement
  • Ideal for up to ¾ acre with dual active battery ports and (2) included 40V 6Ah batteries for up to 70 minutes of runtime using both batteries. On-board fuel gauge displays remaining runtime
  • CROSS CUT Multi-Blade System allows for less clumping when mulching, further & more even dispersal when side discharging, and when bagging the fine clippings fill from back to front to maximize space for less bag changes
  • Brushless motor and advanced electronics automatically react to mowing conditions by increasing the blade speed to eliminate bogging down and powering through the toughest cut
  • This WHISPER SERIES mower is engineered to be 85% quieter than gas, and even quieter than other cordless mowers, allowing you to mow any time of day without disturbing others & making it perfect for areas with noise restrictions
  • The all-wheel drive system gives you ultimate maneuverability and control in any terrain by providing full power to all four wheels, while SMART TREK self-propelled technology allows you to easily adapt the mower's speed to your pace with less fatigue
  • Experience gas performance with just the push of a button. No gas, no maintenance, no hassle.
  • Single-point height adjustment allows you to quickly select the perfect height for your lawn with 7 different positions (1 in.- 4 in.)
  • The pass through bag removal allows you to quickly empty the grass bag without spilling grass clippings & the one-touch folding handles quickly and easily collapse for compact, vertical storage even in tight places
  • Each battery recharges in less than 60 minutes with included 40V Rapid Charger
  • An integrated mulch plug switches from bagging to mulching by simply pulling a lever
  • The 11" high wheel design allows you to turn more easily and provides better overall traction and maneuverability
  • 21" durable composite deck is lightweight, resists corrosion, and is covered by a limited lifetime warranty
  • High-intensity LED headlights allow you to mow at dawn or dusk
  • Compatible with AC04031 21" Multi-Blade System Replacements, AC21GB Replacement Grass Bag, AC04020FC Extra Capacity Grass Bag, ACMC02 Mower Cover, ACLS01 Lawn Striper
  • Part of the RYOBI 40V System - Any 40V Battery Works With Any 40V Product
  • Proudly made in the USA with 5-year manufacturer's tool warranty; 3-year manufacturer's battery warranty
  • Includes: RY401021 40V HP Brushless 21" AWD Lawn Mower, (2) OP40605 40V 6Ah Lithium Batteries, OP406 40V Rapid Charger, Grass Catcher Bag, Start Key, Side Discharge Chute, and Operator's Manuals
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Product Information

Internet # 317845502

Model # RY401210

Store SKU # 1006779395

Specifications

Dimensions

Cutting Width (in.)

21 inches

Mower Deck Width (in.)

23 in

Details

Battery Amp Hours

6 Ah

Battery Run Time (min.)

70

Battery Voltage (V)

40V

Battery/Charger

(2) 6 Ah Batteries & Charger Included

Charge Time (hours)

1

Charger Included

Charger Included

Cutting Height Options

7-position

Cutting Options

Bag, Mulch, Side-Discharge

Deck Material

Polymer Composite

Drive Type

4 Wheel Drive

Features

Adjustable Cutting Height, Adjustable Handlebar, Adjustable Speed, Assembly Required, Bagger, Brushless Motor, Foldable handle, Headlights, High Wheel, Mulching Lawn Mower, No Oil Change Required, Residential, Single-lever height adjustment, Variable Speed

Included

Bagger, Battery(s), Charger, Wheels

Lawn Mower Type

Self-Propelled Lawn Mower

Maximum Cutting Height (in.)

4 in

Minimum Cutting Height (in.)

1 in

Mower Size Type

Standard

Number of Blades

2

Number of Total Batteries Included

2

Outdoor Power Combo

Single

Power Type

Battery

Recommended Terrain

Flat, Sloped, Uneven

Returnable

90-Day

Size of Yard

1/2 - 1 Acre

Start Type

Push Button Start

Walk Behind Mower Type

Self Propelled

Warranty / Certifications

Manufacturer Warranty

5 Year Mower, 3 Year Battery

Questions & Answers

Does the AWD 21” mower have a shut off when it exceeds specific angles? I have a hilly yard and want to be sure it doesn’t have this functionality.
BySep 8, 2026
1 Answer | 
Answer This Question

Hello, Pittsburghmike - This mower has a tilt sensor that prevents the unit from starting if it is tilted at an angle greater than 45 degrees. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

By|Sep 10, 2026


    I have Ry401021US lawn mower AWD. The motor stopped working. When I press the start button the motor does not start. It can move forward when I push forward Handel. Battery is work and charged. What could be the cause of the problem. It is a 2.5 year old
    ByAug 28, 2026
    1 Answer | 
    Answer This Question

    Hello, Bassam jirjis - Here are a few things to check: - Start key and battery selection: This mower has dual battery ports and a start key that selects which battery is in use. We recommend confirming the start key is installed and that its arrow points to the battery you intend to use; otherwise, the mower won’t draw from your charged pack. - Battery seating: We recommend ensuring the battery pack(s) are fully inserted so the latch snaps and the packs are securely seated in the battery port. A pack that isn’t fully latched can prevent operation. - If the issue persists: We recommend inspecting for damaged or missing parts and contacting customer service for assistance. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

    By|Aug 31, 2026


      Looking front plastic cover handle
      ByAug 7, 2026
      1 Answer | 
      Answer This Question

      Hello, Yourtime1 - Available replacement parts can be purchased at https://ryobipower.ordertree.com/. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

      By|Aug 10, 2026


        Are there regional warehouses that supply repair shops with parts or are all repair parts shipped to the USA from foreign countries?
        ByAug 6, 2026
        1 Answer | 
        Answer This Question

        Hello, Bemmie - Our parts supplier, Gardner Inc, is located in Ohio. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

        By|Aug 10, 2026


          what is the max AH battery these mowers can run? are there limits?
          ByJul 22, 2026
          1 Answer | 
          Answer This Question

          Hello, Rb373 - This mower works with any 40V RYOBI battery! If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

          By|Jul 24, 2026


            If I purchase a RY401210 and it does not perform well enough for me, will I have the ability to return it enough thought is used? Under a customer satisfaction faction warranty
            ByMay 24, 2026
            1 Answer | 
            Answer This Question

            Hello, Goej - We recommend contacting Home Depot for questions about their return policy. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

            By|Jul 7, 2026


              Are there two separate motors for the front and back wheels?
              ByMay 16, 2026
              1 Answer | 
              Answer This Question

              Hello, Hdr7 - No, this lawnmower has only one motor. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

              By|May 23, 2026


                What system drives the front and back wheels with the battery power?
                ByApr 30, 2026
                1 Answer | 
                Answer This Question

                Hello, Cem1 - There are two transmissions that drive the AWD (all wheel drive) system. If you need further support, then feel free to ask another question. You can also contact us by phone at 1.800.525.2579, Monday - Friday from 9am to 6pm (EST), or via email when you visit us at https://www.ryobitools.com/support/contact. This question is from RYOBI 40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger (RY401210).

                By|May 5, 2026


                  Viewing 1-8 of 187

                  Customer Reviews

                  4.2 out of 5

                  • 4.2 out of 1,445 reviews
                  • 82% recommend this product
                  Filter by:
                  Showing 1-10 of 1,445 reviews
                  Great all-wheel-drive mower couple year review
                  [This review was collected as part of a promotion.] This has been a good replacement mower for our old gas mower that always had carburetor problems due to ethanol fuel. Our yard has lots of hills and the all-wheel-drive does well except for the rear tires start to fall apart after the second year. Battery life gets weak after a couple years as well. Batteries are expensive we bought a third one to get longer runtime, but still struggles holding a charge. Overall, we would buy one again due to the all-wheel-drive.
                  by
                    • Recommended
                    Good for a couple of years but batteries fail
                    1st electric mower. Does a good job cutting g but found the cut uneven sometimes so had to do a second pass compared to my gas mower. Big issue is one battery went down after a year. It was replaced. The second battery is now bad and it’s just at 3 year warranty however I can track down my receipt. You would think that since it m already in their system they could verify me but it looks like it will be out of pocket. A replacement battery is almost $350 so I’m not impressed. I’ve always let my batteries cool down before recharging and have stored them correctly. From what I’ve read online, plenty of other users with the same generation of mower I have are having the same issue. I’d suggest that you don’t get rid of your gas mower and keep it as a backup
                    by
                      Bad place for wire
                      The cord ran right into The area where it Folds Uo
                      by
                      Response from RYOBIAug 3, 2026
                      Hello, Kate - We are sorry to hear that you have had some difficulty with your mower. If you would, please reach out to us via our Contact Us page at https://www.ryobitools.com/support/contact. RYOBIOutdoorTools
                        Great mower, bad batteries!
                        I got this mower just under 2 years ago. I have been pretty happy with the mower in general. The runtime is good, the adjustable height is easy to use which I really appreciate. Overall a good mower. The issue I have is it came with 2 40 V 6 AH batteries and one of them is already broken. It won't charge or work. They charge $220 for a new battery! The battery has a serial number that says it was made in 2022 so no warranty either even though I got everything new a couple years ago. In the end, it doesn't matter how good the mower is if the battery doesn't last.
                        by
                        Response from RYOBIJun 30, 2026
                        Hello, T - We're sorry to hear that one of your batteries is no longer working. If you would, please reach out to us via our Rapid Repair page at https://ryobi.ryobitools.com/support/rapid-repair. RYOBIOutdoorTools
                          Overall great product
                          [This review was collected as part of a promotion.] Just got this this season on, used it for the first time yesterday. Have an average ¼ acre lot, battery lasted more than long enough. Both the bag and the mulch mode work great, looking forward to using it more this season.
                          by
                            • Recommended
                            Battery Degradation
                            [This review was collected as part of a promotion.] Dear Ryobi: "As long-time users of the Ryobi ecosystem, we appreciate the quality of your tools. Unfortunately, our experience with the lawn mower battery has been frustrating lately. The charging process takes an excessive amount of time, while the actual runtime during mowing has noticeably decreased. It is disappointing when the downtime exceeds the work time. We love the brand but feel the battery technology needs more consistency for larger tasks. (possibly recalled?)
                            by
                              • Recommended
                              Great product
                              [This review was collected as part of a promotion.] Excellent mower for my yard, I have really enjoyed using this battery powered mower. I would recommend this product for anyone thinking about electric/battery powered mower.
                              by
                                • Recommended
                                Just 5 months of usage- motor is getting struck or
                                [This review was collected as part of a promotion.] I brought this 6 months ago and started using from may 2025. Motor or mover getting stopped and not restarting even the battery is full.
                                by
                                Response from RyobiSep 8, 2025
                                Hello, Sarathn - We're disappointed to find out that your lawnmower isn't working properly. And we'd like to connect so we can find a beneficial resolution for you. Would you mind sending us an email at Reviews@RYOBItools.com?
                                  ¡Recomedado!
                                  Excelente máquina. Rápida y eficiente. Hice todo en una sola carga de baterías, solo usé el 35% de su capacidad total.
                                  by
                                    • Recommended
                                    great deals and great products
                                    [This review was collected as part of a promotion.] All Ryobi products that I’ve bought have excellent, I have almost all ONE+ and Expand-it collection and this lawn mover is not the exception, great deals and great products .
                                    by
                                      • Recommended
                                      Showing 1-10 of 1,445 reviews

                                      40V HP Brushless Whisper Series 21" Walk Behind Self-Propelled All Wheel Drive Lawn Mower-(2) 6.0 Ah Batteries & Charger

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                                      Compare Key Features

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                                      Product Snapshot

                                      Great for homeowners looking for a powerful and quiet mowing experience, making yard work easier. This mower is self-propelled with all-wheel drive, ensuring efficient operation on various terrains.
                                      Ideal for homeowners who want gas-like power, ensuring effortless, efficient lawn care.
                                      Ideal for customers who want gas-like power, all-wheel drive, and quiet operation.
                                      Ideal for customers who want gas-like power and versatility, ensuring effortless yard maintenance.

                                      Battery Life

                                      Up to 70 minutes
                                      Up to 80 minutes
                                      Up to 75 minutes
                                      Up to 75 minutes with 40V 6Ah batteries

                                      Cutting Width

                                      21 in.
                                      21 inches
                                      21 in.
                                      21 in.

                                      Power Source Cordless?

                                      Battery Recharge Time

                                      Less than 60 minutes
                                      1 hour
                                      1 hour
                                      Under 90 minutes

                                      Self-propelled Drive?