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Greenworks 60V 21" Self-Propelled Cordless Lawn vs RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah

Updated July 2026 — Greenworks 60V 21" Self-Propelled Cordless Lawn wins on runtime and weight, RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah wins on noise level and storage.

The Greenworks mower excels in power and runtime for larger lawns, while the RB mower is ideal for small spaces and affordability.

Why Greenworks 60V 21" Self-Propelled Cordless Lawn is better

Power

60V brushless motor vs 40V motor

Runtime

Dual 4.0Ah batteries vs single 2Ah battery

Durability

IPX4-rated waterproof vs standard construction

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

Weight

11.5 lbs vs 56 lbs

Price

$169.99 vs $538.00

Maneuverability

One-hand steering vs standard control

Overall score

Greenworks 60V 21" Self-Propelled Cordless Lawn
85
RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah
65

Specifications

SpecGreenworks 60V 21" Self-Propelled Cordless LawnRB 9" Small Lawn Mower for Small Spaces, 40V 2Ah
Motor Power60V40V
Cutting Height7 settings3 settings
Self-PropelledYesNo
LED LightsYesNo
Safety FeaturesStandardAutomatic stop

Dimension comparison

Greenworks 60V 21" Self-Propelled Cordless LawnRB 9" Small Lawn Mower for Small Spaces, 40V 2Ah

Overview of the Greenworks 60V 21" Self-Propelled Cordless Lawn Mower

The Greenworks 60V 21" Self-Propelled Cordless Lawn Mower is tailored for homeowners seeking powerful performance for larger yards. Priced at $538.00, this mower features a 60V brushless motor that delivers gas-like power, capable of mowing up to 3/4 acre on a single charge. It comes with two 4.0Ah batteries and a dual-port charger, ensuring a runtime of over 60 minutes. The rear-wheel drive offers effortless self-propelled control, making it ideal for tackling slopes and thick grass. This model also boasts a quiet operation, producing noise levels three times lower than gas mowers, which is perfect for early mornings or residential areas.

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

The RB 9" Small Lawn Mower is designed for compact spaces, being much more affordable at $169.99. It features a 40V 2Ah battery, suitable for small lawns of up to 540 square feet. Weighing only 11.5 lbs, this ultra-light mower ensures easy maneuverability with its one-hand steering and pivoting front wheels. The adjustable cutting height allows users to maintain grass between 1.2" to 2", ensuring a well-groomed lawn. Although it’s not intended for larger yards, it offers an efficient and convenient solution for small areas while prioritizing safety with automatic stop features if tilted beyond certain angles.

Power and Performance Comparison

The Greenworks mower stands out with its 60V brushless motor, achieving a cutting speed of 3200 RPM, which is significantly more powerful than the RB mower's 6000 RPM motor, albeit the latter is designed for lighter tasks. While the Greenworks is ideal for large lawns, the RB mower is optimized for small yards, making it efficient for up to 540 square feet. The Greenworks mower’s runtime is about 60 minutes, while the RB mower's efficiency allows for quick tasks without the need for extensive power. The power difference caters to different user needs, where the Greenworks is best for larger areas, and the RB excels in compact environments.

Battery and Runtime Efficiency

The Greenworks mower includes two 4.0Ah batteries, providing a substantial runtime that can cover larger areas without interruption. In contrast, the RB mower comes with a smaller 40V 2Ah battery, which is perfect for short, quick jobs in small yards. The price difference is notable, with the Greenworks mower costing about 216% more than the RB model. While the Greenworks provides dual batteries for extended tasks, the RB mower’s single battery suffices for its target audience, ensuring that users can choose based on the size of their lawn and their mowing needs.

Design and Usability Features

The Greenworks mower features an ergonomic design with adjustable rear-wheel drive, allowing users to easily navigate through uneven terrain and slopes. It also includes LED headlights for visibility during early mornings or late evenings, enhancing usability. On the other hand, the RB mower emphasizes compactness and lightweight design, weighing only 11.5 lbs. Its one-hand steering and upright storage capability make it very user-friendly for tight spaces. While the Greenworks targets a more robust mowing experience, the RB caters to convenience and ease of use for smaller lawns.

Maintenance and Durability

Both mowers are designed for minimal maintenance, with the Greenworks mower operating three times quieter than traditional gas mowers, promoting a peaceful mowing experience. The brushless motor technology in both models requires less upkeep compared to gas engines. However, the Greenworks mower's all-season durability, featuring rust-proof aluminum handles and IPX4-rated waterproof construction, suggests it is built for long-term use in various weather conditions. The RB mower, while efficient for small tasks, may not offer the same level of durability for extensive use but does provide a reliable option for small yard care.

Price Comparison and Value

With a price tag of $538.00, the Greenworks mower is positioned as a premium choice for serious lawn care, particularly for larger yards. In contrast, the RB mower is priced at $169.99, making it about 68% cheaper. This significant price difference reflects their intended market segments: the Greenworks for extensive yard maintenance and the RB for small, manageable lawns. Each model offers value based on its target user; while the Greenworks provides extensive features for larger properties, the RB focuses on affordability and compact efficiency.

Which should you buy?

Choosing between the Greenworks 60V 21" Self-Propelled Cordless Lawn Mower and the RB 9" Small Lawn Mower ultimately depends on your lawn size and mowing needs. If you have a larger yard and prioritize power, durability, and extended runtime, the Greenworks model is the clear choice despite its higher cost. However, for those with small spaces who seek convenience and affordability, the RB mower presents an excellent option without breaking the bank. Assess your specific needs and yard size to make the best decision for your mowing requirements.