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RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah vs WORX Nitro 21" Cordless Lawn Mower, Brushless

Updated July 2026 — RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah wins on storage space, WORX Nitro 21" Cordless Lawn Mower, Brushless wins on runtime and weight.

The RB 9" Small Lawn Mower is ideal for small spaces, while the WORX Nitro 21" excels in performance for larger lawns.

Why RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah is better

Price

RB is $169.99, significantly cheaper than WORX at $379.99.

Weight

RB weighs only 11.5 lbs, making it easier to maneuver.

Storage

RB saves up to 70% space with its upright storage design.

Why WORX Nitro 21" Cordless Lawn Mower, Brushless is better

Power

WORX has a brushless motor delivering 40% more power.

Runtime

WORX includes two batteries for up to 50 minutes of runtime.

Cutting Width

WORX has a larger 21" cutting deck for bigger lawns.

Overall score

RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah
75
WORX Nitro 21" Cordless Lawn Mower, Brushless
85

Specifications

SpecRB 9" Small Lawn Mower for Small Spaces, 40V 2AhWORX Nitro 21" Cordless Lawn Mower, Brushless
Motor TypeBrushlessBrushless
Max Area540 sq.ft.1/2 acre
Cutting Heights1.2" - 2"1.5" - 4"
Batteries1 x 40V2 x 20V
Safety FeaturesTilt StopIntellicut

Dimension comparison

RB 9" Small Lawn Mower for Small Spaces, 40V 2AhWORX Nitro 21" Cordless Lawn Mower, Brushless

Overview of the RB 9” Small Lawn Mower for Small Spaces

The RB 9” Small Lawn Mower for Small Spaces is designed specifically for tight areas, making it an excellent choice for small yards. Priced at $169.99, this lawn mower features a high-speed brushless motor that operates at 6000 RPM, providing efficient cutting while maintaining a low maintenance profile. It is lightweight, weighing just 11.5 lbs without the battery, and is equipped with three adjustable cutting heights ranging from 1.2” to 2”. Its compact design allows for easy maneuverability, making it ideal for small spaces and corners.

Overview of the WORX Nitro 21” Cordless Lawn Mower

The WORX Nitro 21” Cordless Lawn Mower is built for larger lawns, capable of handling up to half an acre with its powerful brushless motor, which delivers 40% more power than previous models. With a price tag of $379.99, this mower integrates advanced features, including aerodeck technology for improved cutting efficiency and Intellicut technology that adjusts speed based on grass density. Weighing more than the RB mower, it also offers a larger cutting deck and seven height adjustments from 1.5” to 4”, making it versatile for different lawn conditions.

Performance Comparison

In terms of performance, the WORX Nitro 21” stands out with its brushless motor that not only enhances power but also ensures longer runtimes compared to traditional models. It can effectively mow larger areas, making it suitable for more extensive lawns. The RB 9” mower, while powerful for its size, is best suited for lawns up to 540 sq. ft., which is significantly less than the area the WORX can handle. This difference in performance capabilities makes the WORX a better choice for those with larger properties, while the RB mower excels in small, confined spaces.

Cutting Efficiency

The cutting efficiency of the WORX Nitro 21” is enhanced by its aerodeck technology, which reduces clumping and optimizes bag collection, ensuring a clean cut every time. The adjustable cutting height feature allows users to choose from seven settings, catering to various grass types and conditions. Conversely, the RB 9” mower, with its three height settings, provides adequate cutting options for small lawns. However, it may not offer the same level of precision in diverse mowing conditions as the WORX, which can handle denser grass more effectively.

Ease of Use and Maneuverability

The RB 9” Small Lawn Mower is designed for ease of use, particularly in tight spaces. Its lightweight construction and one-handed steering capability make it easy to navigate around obstacles. The WORX Nitro 21”, while slightly heavier, features a fully collapsible handle for convenient storage and an intuitive height adjustment lever. Both mowers have user-friendly designs, but the RB is particularly advantageous for those who need to maneuver in small yards without hassle.

Battery and Runtime

Battery performance is a critical factor for cordless mowers. The RB 9” comes with a 40V 2Ah battery, which is suitable for its compact design and area coverage. The WORX Nitro includes two 20V 5.0Ah batteries, doubling the runtime to about 50 minutes, which is ideal for larger mowing tasks. This makes the WORX a superior option for users who require longer mowing sessions without frequent recharges. In contrast, the RB's battery may suffice for short mowing tasks but could be limiting for larger areas.

Storage and Portability

When it comes to storage and portability, the RB 9” excels due to its ultra-lightweight design and upright storage capabilities, saving up to 70% of space. This is especially beneficial for those with limited storage options. The WORX Nitro, while also designed for convenient storage with its collapsible handle, does take up more space due to its larger size. Therefore, if compact storage is a priority, the RB is the clear winner in this category.

Which should you buy?

Choosing between the RB 9” Small Lawn Mower and the WORX Nitro 21” Cordless Lawn Mower ultimately depends on your specific lawn care needs. If you have a small yard that requires quick, efficient mowing and easy maneuverability, the RB 9” is a great choice at $169.99, making it about 17% cheaper than the WORX Nitro. However, if you have a larger area to maintain and need a mower that offers more power, longer runtime, and advanced features, the WORX Nitro at $379.99 is worth the investment. Its performance and versatility make it an excellent option for users with bigger lawns.