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Greenworks 80V 21" Self-Propelled Cordless Lawn vs RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah

Updated July 2026 — Greenworks 80V 21" Self-Propelled Cordless Lawn wins on weight and cutting width, RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah wins on storage and maneuverability.

The Greenworks mower excels in power and versatility, while the RB mower is ideal for small spaces and ease of use.

Why Greenworks 80V 21" Self-Propelled Cordless Lawn is better

Power

Higher torque and efficiency for larger lawns

Features

4-in-1 cutting system and LED lights

Durability

Built with a steel deck and robust motor

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

Weight

Ultra-lightweight design for easy maneuverability

Price

More affordable for budget-conscious buyers

Storage

Compact design allows for upright storage

Overall score

Greenworks 80V 21" Self-Propelled Cordless Lawn
85
RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah
65

Specifications

SpecGreenworks 80V 21" Self-Propelled Cordless LawnRB 9" Small Lawn Mower for Small Spaces, 40V 2Ah
Battery4.0Ah2.0Ah
Motor TypeBrushlessBrushless
Cutting Height4 heights3 heights
Self-PropelledYesNo
LED LightsYesNo

Dimension comparison

Greenworks 80V 21" Self-Propelled Cordless LawnRB 9" Small Lawn Mower for Small Spaces, 40V 2Ah

Overview of the Greenworks 80V Self-Propelled Lawn Mower

The Greenworks 80V 21" Self-Propelled Cordless Lawn Mower is a powerful option designed for homeowners who need a robust mowing solution. Priced at $479.99, it is positioned as a high-performance tool capable of handling larger lawns of up to half an acre. This mower is equipped with a brushless motor that offers increased efficiency and longevity, making it a more durable investment for serious gardeners. With features like a self-propelled drive and a 4-in-1 cutting system, this mower is tailored for those looking for versatility and ease of use in their lawn care routine.

Overview of the RB Small Lawn Mower

In contrast, the RB 9" Small Lawn Mower for Small Spaces is designed for minimalists and those with small, urban yards. At a price of $169.99, it offers an economical choice for managing lawns up to 540 square feet. This ultra-lightweight mower weighs only 11.5 pounds without the battery, making it highly maneuverable and easy to store. Its compact size and one-hand steering feature are perfect for navigating tight corners and small areas, appealing to users who prioritize convenience and space-saving solutions.

Performance Comparison

When it comes to performance, the Greenworks mower stands out with its brushless motor that generates 30% more torque than standard models, providing the ability to tackle tough grass and uneven terrain effectively. The self-propelled feature allows for variable speed control, enhancing maneuverability. This mower is ranked 1880 in sales, indicating its popularity among consumers looking for a powerful lawn care tool.

On the other hand, the RB small mower features a high-speed brushless motor that operates at 6000 RPM, offering efficient cutting for smaller lawns. Its adjustable cutting height allows for customization, making it suitable for various grass types. Although it is not designed for large areas, it provides sufficient power for its intended use, evidenced by its sales rank of 20912, which suggests a more niche market appeal.

Battery and Charging Efficiency

The Greenworks mower comes with a 4.0Ah battery, which is designed to last through extensive mowing sessions. This battery is compatible with over 75 Greenworks tools, making it a versatile investment for users who plan to expand their outdoor equipment collection. The convenience of a rapid charger further enhances its usability.

Conversely, the RB mower is powered by a 40V 2Ah battery, which is significantly smaller, reflecting its design for less demanding tasks. With a focus on ease of use, it comes with a charger and is ready to operate right out of the box. The smaller battery size aligns with its target market of small lawn owners, where extended battery life is less critical.

Design and Usability

The Greenworks mower features a durable steel deck and a 21" cutting width, providing efficient coverage for larger lawns. Its LED headlights enable early morning or late evening mowing, appealing to those with busy schedules. The mower’s self-propelled design contributes to its ease of use, especially on sloped terrain.

In contrast, the RB mower is designed for compactness and ease of handling. Its ultra-lightweight build and one-hand steering make it particularly user-friendly for those who may struggle with heavier equipment. The upright storage capability is a significant advantage for individuals with limited storage space, making it easy to tuck away when not in use.

Safety Features

Safety is a priority in both mowers, but they approach it differently. The Greenworks mower offers a robust build and a reliable motor that minimizes noise and emissions, making it safe for both users and the environment. It is designed to handle various mowing conditions, contributing to a safer mowing experience.

The RB mower incorporates advanced safety features by automatically stopping if tilted beyond a certain angle, adhering to US safety standards. This feature is particularly beneficial for novice users or those who may be less experienced with lawn care equipment. It highlights the mower's focus on safety and ease of use, especially in small yard settings.

Price Comparison

The Greenworks mower is priced at $479.99, which reflects its advanced features and capabilities. This price point places it in the premium segment of the lawn mower market. In comparison, the RB mower is about 65% cheaper at $169.99, making it an appealing option for budget-conscious consumers or those who only need a mower for small, flat areas. The price difference signifies the varying target markets, with the Greenworks mower catering to serious homeowners and the RB mower focusing on casual users.

Which should you buy?

Ultimately, the decision between the Greenworks 80V Self-Propelled Lawn Mower and the RB Small Lawn Mower boils down to the size of your lawn and your specific lawn care needs. If you have a larger yard and require a powerful, versatile mower, the Greenworks option is a worthwhile investment. However, for those with small spaces and a need for lightweight, easy-to-store equipment, the RB mower presents an economical and practical choice. Each mower serves its purpose well, but your choice should reflect your lawn's size and your personal preferences.