Nitro 40V Cordless 21" Self-Propelled Lawn Mower with Brushless Motor and Rear Wheel Drive

Nitro 40V Cordless 21" Self-Propelled Lawn Mower with Brushless Motor and Rear Wheel Drive is rated 4.1 out of 5 by 130.
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5 Year Warranty
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  • Gas-like power—Worx NITRO™ outdoor tools are engineered to provide gas-like power, performance, and run time.
  • Self-propelled lawn mower featuring rear-wheel drive with variable speed control.
  • 3-in-1 functionality—Mulch / Bag / Side-Discharge.
  • Brushless motors are more efficient, run 50% longer, are 25% more powerful, and have 10% longer life.
  • Auto-IntelliCut™ technology automatically adjusts performance to grass conditions.
  • Durable, 21 in. steel cutting-deck w/ NutriCut™ dual-stage mulching capabilities.
  • Single-lever controls for (7-position) cutting height-adjustments and grass/bag mode change.
  • LED lights for visibility in low-light conditions.
  • Charge-level indicator provides quick reference to remaining runtime.
  • One-touch fully-collapsible handle for compact, stand-up storage.
  • Run longer with high-capacity batteries—Worx Power Share™ PRO intelligent batteries deliver extended run times, plus heat and impact protection. Compatible with all Worx 20V and 40V tools, outdoor power, and lifestyle products.


2 x 5.0Ah Power Share PRO
Deck Size
21 in. | Metal
Blade Cut Width
20 in.
Cutting Height
1.6 in. - 4 in. | 7-Position
Bag Capacity
2 Bushels
Wheel Size
Front: 8 in. | Rear: 10 in.
Unit Weight
68.4 lbs. | 63.3 lbs. (bare)
(1) - Worx NITRO™ 40V 21" Self-Propelled Lawn Mower
(1) - Collection Bag
(1) - Side-Discharge Chute
(2) - 5.0Ah Batteries (WA3571)
(1) - Charger (WA3884)

Auto-IntelliCut™ is smart technology inside the lawn mower’s motor. It automatically senses when grass conditions are higher and thicker. Instead of bogging down during these conditions, the lawn mower cutting capabilities speed up to cut more efficiently. On the other hand, when the grass conditions are less demanding, the lawn mower will utilize its lower setting to conserve battery runtime.

Auto-IntelliCut™ refers to the motor changing “speed” to cut more efficiently. On the other hand, the variable speed control lever adjusts the self-propel speed, or pace, at which the lawn mower moves. While operating in more demanding grass conditions, put the lawn mower in a slower speed to provide the blades more time to cut within a given area.

The innovative, quick-change mode lever provides the user the ability to change modes without the use of a plug. No more of a need to store, or lose, the mulch plug. Instead of a plug, the lawn mower deck has a sliding “door” that can be opened or closed to change from bag or mulch/side-discharge modes.

The POWER SHARE™ PRO series of WORX high-capacity batteries are designed for optimal performance and come standard with the WORX NITRO™ product offering. These batteries utilize an intelligent battery management system that monitors each cell to enhance, power, performance, and runtime.
Innovative, thermoplastic material encases each cell to pull heat away and maximize the cell’s performance, resulting in longer runtime.
360° cell protection provides increased security against vibration, drops, and water intrusion. This full-wrap design limits the influence that a compromised cell can have over the rest of the battery pack.

The WA3571 5.0ah POWER SHARE™ PRO battery is 100% compatible with all WORX 20V, 40V, 80V tools, outdoor power, and lifestyle products​ that display the POWER SHAR™E or POWER SHARE™ PRO logo.

Although the WORX POWER SHARE™ PRO high-capacity batteries come standard with WORX NITRO™ products, they can also be utilized on the traditional WORX products to achieve longer runtime.

WORX recommends that POWER SHARE™ PRO batteries be used with WORX NITRO™ products to unlock optimal performance.

No. The WORX POWER SHARE™ PRO batteries can be used on all existing WORX 20V MAX chargers (WA3742, WA3881, WA3764, WA3770, WA3884, WA3835).

No. The batteries require the same amount of charge-time as the standard WORX POWER SHARE™ batteries. However, due to the Cell-Cooling Technology in the POWER SHARE™ PRO batteries, they stay cooler, longer. As a result, less wait-time is needed before a battery can start charging, due to high temperature.

California Proposition 65 Warning 

Warning: This product can expose you to chemicals including lead and Di(2-ethylhexyl)phthalate (DEHP) which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

ADVERTENCIA: Este producto puede exponerle a químicos incluyendo lead and Di(2-ethylhexyl)phthalate (DEHP), que son conocidos por el Estado de California como causantes de cáncer y defectos de nacimiento u otros daños reproductivos. Para mayor información, visite

AVERTISSEMENT: Ce produit peut vous exposer à des agents chimiques, y compris lead and Di(2-ethylhexyl)phthalate (DEHP), identifiés par l'État de Californie comme pouvant causer le cancer et des malformations congénitales ou autres effets nocifs sur la reproduction.  Pour de plus amples informations, prière de consulter

orange, black and white logo for Worx NITRO toolsorange, black and white logo for Worx NITRO tools

The Power to Outperform

The power and advanced technology to expertly handle any level project with Worx NITRO cordless tools and accessories. Do more, finish faster and deliver real results with every charge.

Worx Nitro 40V 21" Self-Propelled Lawn Mower

The Power to Outperform Gas Mowers


With rear-wheel drive and variable-speed control. One lever changes the pace of the mower depending on your preference, or how thick the grass is.

Brushless Motor & High-Capacity Batteries

Gas-like power, performance, and runtime delivered by a brushless motor paired with Power Share™ PRO intelligent batteries.

Auto-Intellicut™ Technology

Internal sensors detect when the grass gets thicker and turns up the torque to power through. Once the grass is less-dense, Auto-IntelliCut™ turns the torque back down to conserve battery usage.

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Advanced Enginnering

Efficiency and advanced engineering powered by cutting-edge research and innovation produces professional grade cordless tools.

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Brushless Motor

Brushless motors are also lighter and more compact than traditional motors, making Worx NITRO™ tools lighter and easier to operate even in the toughest conditions.

power share 20v pro batterypower share 20v pro battery

Gas-like Power With Power Share™

Power Share™ PRO is a next level Lithium-Ion battery that offers upgrades like greater amp hours for extended run times, heat and impact protection, and longer lifespan so you can do more on every charge.

orange, black and white logo for Worx NITRO toolsorange, black and white logo for Worx NITRO tools

The Power to Outperform

The power and technology to do more, finish faster and deliver real results with every charge.