Greenworks 80V 21” Brushless Cordless Electric vs RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah
Updated July 2026 — Greenworks 80V 21” Brushless Cordless Electric wins on size and versatility, RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah wins on weight.
The Greenworks 80V mower offers superior performance and versatility, while the RB mower is a lightweight and budget-friendly option for small spaces.
Why Greenworks 80V 21” Brushless Cordless Electric is better
Performance
Greenworks has a more powerful motor for larger areas.
Versatility
Includes multiple tools for comprehensive lawn care.
Battery Life
Comes with two batteries for extended use.
Why RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah is better
Weight
RB mower is ultra-lightweight for easy maneuverability.
Price
RB mower is significantly cheaper.
Storage
Compact design saves space.
Overall score
Specifications
| Spec | Greenworks 80V 21” Brushless Cordless Electric | RB 9" Small Lawn Mower for Small Spaces, 40V 2Ah |
|---|---|---|
| Motor Power | 80V | 40V |
| Cutting Width | 21 inches | 9 inches |
| Battery Type | 2x2Ah | 1x2Ah |
| Cutting Heights | 7 | 3 |
| Included Tools | 3 | 1 |
Dimension comparison
Overview of the Products
The Greenworks 80V 21” Brushless is a robust lawn mower and maintenance combo, while the RB 9” Small Lawn Mower is a compact solution designed for small spaces. The Greenworks model is priced at $499.99 and is equipped with multiple tools, making it a comprehensive package for yard care. In contrast, the RB mower costs $169.99 and targets users with limited lawn space, offering an ultra-lightweight design. The price difference between the two products is significant, with the Greenworks model being about 194% more expensive than the RB mower.
Performance and Power
When it comes to performance, the Greenworks 80V 21” Brushless mower stands out with its powerful 80V brushless motor, designed for efficient lawn maintenance. This mower is capable of handling larger areas and more demanding tasks. In comparison, the RB 9” mower features a 6000RPM brushless motor, which is sufficient for small lawns up to 540 square feet. While the Greenworks model is ideal for medium to large yards, the RB mower excels in maneuverability and efficiency within limited spaces, making it a practical choice for urban settings.
Features and Versatility
The Greenworks combo kit offers a versatile 3-in-1 system, allowing users to mulch, bag, or discharge clippings, catering to various lawn care preferences. It also includes a 13” string trimmer and a 500 CFM blower, enhancing its utility beyond just mowing. The RB mower, however, focuses on simplicity with three adjustable cutting heights, making it easy to maintain a well-groomed lawn without the complexity of additional tools. This difference highlights the Greenworks model's comprehensive approach versus the RB mower's straightforward functionality.
Battery Life and Convenience
Battery convenience is a key factor in both products. The Greenworks mower comes with two 2Ah batteries and a 30-minute rapid charger, allowing for extended use and quick recharging. This setup is beneficial for users who need to tackle larger lawns without interruption. Conversely, the RB mower is powered by a 40V 2Ah battery, which is adequate for its intended small space usage. While the Greenworks kit features a more robust battery solution, the RB mower's single battery system is designed for its lightweight and compact nature.
Design and Ease of Use
The design of the Greenworks 80V mower incorporates user-friendly features such as a 7-position height adjustment, LED lights for low-light conditions, and vertical storage capability. This ensures comfort and convenience during operation. On the other hand, the RB 9” mower is ultra-lightweight at only 11.5 lbs (without the battery), making it highly maneuverable with a one-hand steering system. The compact size and upright storage design of the RB mower save space, making it easy to handle and store, particularly in smaller homes or apartments.
Safety Features
Safety is another important aspect when comparing these two mowers. The Greenworks model does not explicitly list safety features but focuses on performance and convenience. In contrast, the RB mower has advanced safety designs that automatically stop the mower if tilted beyond a certain angle, adhering to US safety standards. This makes the RB mower a suitable choice for beginners or those who may be concerned about safety while mowing.
Price Comparison
The pricing of the two products highlights a significant difference in their market positioning. The Greenworks 80V 21” Brushless is priced at $499.99, while the RB 9” Small Lawn Mower is available for $169.99. This means the Greenworks model is approximately 194% more expensive than the RB mower. While the higher price of the Greenworks mower can be justified by its extensive features and versatility, the RB mower offers a cost-effective solution for those with smaller yards or limited budgets.
Which should you buy?
Choosing between the Greenworks 80V 21” Brushless mower and the RB 9” Small Lawn Mower ultimately depends on your specific lawn care needs. If you have a larger yard requiring versatile tools and robust performance, the Greenworks model is an excellent investment, especially with its comprehensive package of a lawn mower, blower, and trimmer. However, for those with smaller lawns or limited storage space, the RB mower presents a practical, lightweight, and budget-friendly option. The decision should align with your lawn size, maintenance preferences, and budget considerations.

