Greenworks
Greenworks 80V 21 Inch Self-Propelled Cordless Lawn Mower: Detailed Spec Analysis
The Greenworks 80V 21" Self-Propelled Cordless Lawn Mower pairs a high-voltage brushless motor with a wide 21-inch steel deck to deliver gas-comparable cutting power without the fumes, oil changes, or pull-cord frustration. Rear-wheel drive and variable speed control make it genuinely capable on gentle slopes, and the 3-in-1 discharge gives homeowners flexibility on every cut.
It's best suited for suburban lots up to half an acre where low-maintenance, quiet operation is a priority.
As an Amazon Associate, we earn from qualifying purchases. This does not affect our analysis or recommendations.
Last updated: . Based on our analysis of 364 lawn mowers.
What Sets It Apart
Key specification highlights based on our analysis.
21.0-Inch Cutting Deck
Wide cutting path reduces passes (walk-behind avg: 18.0 in)
Steel Cutting Deck
Durable steel deck for long-term use
3-in-1 Discharge
Mulch, side discharge, and rear bag (59 of 364 mowers have all three)
80V Battery System
High-voltage platform for more power (database avg: 38.1V)
Why We Recommend It
- 01.
80V high-voltage platform (more than double the 38V database average) sustains brushless motor performance through thick grass without bogging down
- 02.
21-inch cutting deck reduces mowing passes by roughly 17% compared to standard 18-inch walk-behind mowers
- 03.
4.0Ah battery with included rapid charger handles up to ~1/2 acre (21,780 sq ft) on a single charge according to Greenworks specs
- 04.
Rear-wheel drive variable speed propulsion reduces operator fatigue on larger or slightly hilly yards
- 05.
Push-button start, no oil, no spark plugs, no fuel , customers report operation as quiet as a box fan
Considerations
- 01.
At 75 lbs, this mower is on the heavier side for a cordless model, which can make lifting for storage or transport less convenient
- 02.
Single 4.0Ah battery included , large yards over half an acre may need a second battery for uninterrupted mowing
- 03.
Not designed for steep inclines; rear-wheel drive helps on mild grades but is not a substitute for a dedicated hillside mower
Technical Specifications
| Feature | Specification |
|---|---|
| Mower Type | Self propelled |
| Power Source | Battery |
| Cutting Width | 21" |
| Deck Material | Steel |
| Blade Type | Rotary |
| Battery | 80V 4Ah |
| Drive | Rear wheel, Variable Speed |
| Discharge | 3-in-1 (Mulch, Side, Bag) |
| Weight | 75 lbs |
| Start Type | Push button |
Power & Performance
The 80V brushless motor sits well above the 38V platform average found across cordless lawn mowers in its class, translating to more consistent torque through wet or dense grass conditions. Brushless motor technology reduces friction and heat buildup, meaning power delivery stays stable from the first pass to the last without the performance drop common in brushed-motor competitors.
For typical cool-season turf like fescue or Kentucky bluegrass, or warm-season grasses like Bermuda at normal heights, this mower handles routine weekly cuts with ease.
Cutting System
The 21-inch rotary steel deck provides a durable, wide cutting path that reduces the total number of passes needed to mow a given yard , meaningful time savings over a full season. Cutting height is adjustable to suit different grass types and seasonal needs, and the 3-in-1 discharge system (mulching, side discharge, and rear bag collection) gives homeowners full control over clippings management.
Only 59 of 364 mowers in the broader market offer all three discharge modes, making this a genuinely flexible system.
Drive & Handling
Rear-wheel drive provides notably better traction than front-wheel-drive cordless mowers when navigating gentle inclines or soft ground, as the drive wheels remain in contact with the terrain under the mower's weight. The variable speed control lets users dial in their walking pace rather than fighting a fixed-speed drive, reducing fatigue on larger properties.
At 75 lbs the mower is sturdy, though maneuvering around tight obstacles or lifting it requires some effort.
Battery / Fuel
The included 80V 4.0Ah lithium-ion battery and rapid charger are ready to go out of the box with no fuel mixing or oil fill required. Greenworks rates runtime sufficient for yards up to 21,780 sq ft (~1/2 acre) on a charge, and customers confirm it covers a 1/4 acre lot comfortably with charge to spare.
The 80V battery is cross-compatible with 75+ Greenworks tools, so existing Greenworks 80V users can leverage additional batteries from their collection to eliminate any runtime concerns.
Who Is This Mower For?
Ideal For
- ✓ Homeowners with 1/4 to 1/2 acre flat or gently sloping suburban yards who want gas-level power without fuel or maintenance hassles
- ✓ Eco-conscious users prioritizing zero direct emissions and significantly quieter operation compared to gas lawn mowers
- ✓ Low-maintenance seekers who dislike pull-start engines, oil changes, and carburetor issues , push-button start and brushless motor require virtually no upkeep
- ✓ Homeowners mowing in early morning or evening who need LED headlights and value quiet, neighbor-friendly operation
Not Ideal For
- ✕ Owners of large properties over 3/4 acre who need extended runtime beyond what a single 4.0Ah battery can deliver without stopping to recharge
- ✕ Users with steep or heavily terraced terrain where a more powerful self-propelled gas mower or dedicated hillside model would provide superior traction and control
- ✕ entry-level-focused buyers who already own a different 80V Greenworks battery ecosystem , though the platform is compatible with 75+ tools, the upfront cost is premium
Assembly is required but is typically straightforward , most users report handle attachment and bag installation taking under 20 minutes with basic tools. The push-button start means no priming or choke adjustments are needed for first use.
Charge the 4.0Ah battery fully before first use to condition the cells and confirm maximum runtime from the start
Attach the grass bag and test all three discharge modes in a small area before your first full mow to get comfortable with the selector lever
Greenworks typically backs their 80V platform tools with a 4-year tool warranty and 2-year battery warranty, though warranty terms should be confirmed on the Greenworks website or product documentation at time of purchase as coverage details can vary by retailer and registration status.
FAQ
How long does the 80V 4.0Ah battery last on a single charge?
Greenworks rates this mower for yards up to 21,780 sq ft (~1/2 acre) per charge. Real-world customer feedback confirms it handles 1/4 acre lots comfortably with battery capacity to spare.
Thick, wet, or tall grass will reduce runtime, so consider a second 80V battery for larger properties.
Is this lawn mower self-propelled, and how does the variable speed work?
Yes , it uses rear-wheel drive self-propulsion with variable speed control, meaning you set the pace to match your natural walking speed rather than being locked into a single gear. This makes a noticeable difference in comfort on longer mowing sessions and on mild inclines where you may want to slow down.
Can the Greenworks 80V brushless motor handle thick or overgrown grass?
The 80V brushless motor delivers sustained torque well above entry-level cordless mowers, making it capable of handling moderately thick grass and slightly overgrown sections. For heavily neglected growth, mowing in two passes at a higher cutting height first will protect the battery and motor and produce a cleaner result.
How does the noise level compare to a gas lawn mower?
Customers describe the Greenworks 80V as dramatically quieter than gas mowers , one reviewer compared it to the sound of a box fan. This makes it well suited for early morning or evening mowing without disturbing neighbors, a key advantage for homeowners in noise-sensitive communities.
Does this mower work on hills and slopes?
The rear-wheel drive system provides better hill traction than front-wheel-drive mowers because the drive wheels sit under the mower's center of weight. It handles gentle to moderate slopes adequately, but for steep or heavily terraced terrain, a more specialized hillside mower would be safer and more effective.
Is the 80V battery compatible with other Greenworks tools?
Yes , the 80V battery platform is compatible with 75+ Greenworks tools including blowers, string trimmers, chainsaws, and snow blowers. If you already own other Greenworks 80V tools, your existing batteries will work with this mower, and the included 4.0Ah battery can power your other 80V equipment.
Bottom Line
The Greenworks 80V 21" Self-Propelled Cordless Lawn Mower is one of the most capable battery-powered mowers available for suburban homeowners who want to leave gas behind without sacrificing cutting performance. The brushless motor, wide steel deck, rear-wheel variable speed drive, LED lights, and 3-in-1 discharge make it a genuinely complete package.
Buyers with very large properties or steep hills should look at higher-capacity battery options or gas alternatives, but for the typical 1/4 to 1/2 acre lot, this mower is hard to beat.
Best for homeowners with flat to gently sloping yards up to 1/2 acre who want powerful, quiet, zero-maintenance cordless mowing.
Consider alternatives if you have steep terrain, a yard significantly over 1/2 acre, or require the extended runtime only a gas engine or dual-battery system can provide.
Check Price on AmazonAs an Amazon Associate, we earn from qualifying purchases. This does not affect our analysis or recommendations.