Greenworks
Greenworks 80V 21 Inch Cordless Lawn Mower: Detailed Spec Analysis
The Greenworks 80V 21" Brushless Cordless Lawn Mower delivers high-voltage battery power that rivals gas performance, with a wide 21-inch steel deck that cuts through tall grass efficiently. The 80V platform, brushless motor, and 3-in-1 discharge system make it a capable all-rounder for suburban yards up to half an acre.
It's best suited for eco-conscious homeowners who want a low-maintenance, push-button-start mower without the fumes or hassle of gas.
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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 brushless motor delivers strong cutting performance even in tall or thick grass , well above the 38.1V database average for cordless mowers
- 02.
21-inch deck is 3 inches wider than the average walk-behind, reducing the number of passes needed on a typical yard
- 03.
3-in-1 discharge (mulch, side discharge, rear bag) offers flexibility , only 59 of 364 mowers in the category offer all three
- 04.
Push-button start, LED headlights, and foldable aluminum handles make the mower easy to use at dawn/dusk and store in tight spaces
- 05.
4-year warranty and no gas engine maintenance: no oil changes, spark plugs, air filters, or carburetor issues
Considerations
- 01.
At 68.3 lbs, this push mower is on the heavier side , pushing it up slopes or hills requires real effort, and it's not self-propelled
- 02.
Single 4.0Ah battery limits runtime , some customers report 15-20 minutes per charge on a full yard, which may require a second battery for larger lots
- 03.
Higher upfront cost than entry-level cordless mowers, though the 80V platform compatibility with 75+ Greenworks tools adds long-term value
Technical Specifications
| Feature | Specification |
|---|---|
| Mower Type | Push |
| Power Source | Battery |
| Cutting Width | 21" |
| Deck Material | Steel |
| Blade Type | Rotary |
| Height Positions | 7 |
| Battery | 80V 4Ah |
| Discharge | 3-in-1 (Mulch, Side, Bag) |
| Weight | 68.3 lbs |
| Foldable Handle | Yes |
| Start Type | Push button |
| Warranty | 4 years |
Power & Performance
The 80V brushless motor is the standout spec here , at more than double the 38.1V category average, the battery platform provides significantly more torque and sustained power under load. Customers consistently note strong performance in tall or overgrown grass, and the brushless motor design means less heat, longer motor life, and better efficiency than brushed alternatives.
This translates to confident cutting in typical suburban grass conditions, including slightly thicker cool-season or warm-season lawns.
Cutting System
The 21-inch steel cutting deck is wider than most walk-behind mowers (average: 18 inches), reducing the number of passes needed per mowing session by roughly 15%. Steel construction offers durability against rocks and debris compared to plastic decks.
The single-lever 7-position cutting height adjustment makes it easy to dial in the right cut without fussing with multiple wheel adjustments. The 3-in-1 discharge system , mulching, side discharge, and rear bagging , puts this mower in a capable minority: only 59 of 364 mowers in its class offer all three options.
Drive & Handling
This is a push mower, so all forward motion is operator-powered. At 68.3 lbs, it's manageable on flat ground and customers report reasonable maneuverability, but the weight becomes a real factor on inclines.
The aluminum handles are a premium touch , lighter and more rigid than plastic , and fold down for compact storage. The overall footprint is well-suited to standard single-car garages and sheds when folded.
Battery / Fuel
The included 80V 4.0Ah battery and rapid charger represent a solid starting package , 80V x 4.0Ah = 320Wh of energy, which is competitive for the cordless segment. Real-world runtime varies based on grass thickness and terrain; customer reports range from 15 to 20+ minutes per charge, which is typical for a 1/4 to 1/2 acre yard in good conditions.
The rapid charger reduces downtime between charges. Because this is a cordless mower with zero fuel system, the only ongoing maintenance is battery care and blade sharpening.
Who Is This Mower For?
Ideal For
- ✓ Homeowners with flat yards up to 1/2 acre (21,780 sq ft) who want gas-like cutting power without engine maintenance or fumes
- ✓ Eco-conscious users who prioritize zero direct emissions and quieter operation for early-morning or neighborhood-friendly mowing
- ✓ Greenworks ecosystem owners , the 80V battery is compatible with 75+ tools, making it a smart platform investment
- ✓ Operators who want reliable, consistent starts , push-button ignition eliminates the frustration of pull-cord starting in any weather
Not Ideal For
- ✕ Owners of hilly or sloped terrain , at 68.3 lbs with no self-propulsion, pushing this mower uphill will be physically demanding
- ✕ Large property owners with yards significantly over 1/2 acre , a single 4.0Ah battery may not complete the full job on one charge
- ✕ Users wanting a hands-off or riding mower experience , this is a manual push mower that requires full operator effort
Assembly is required but straightforward , primarily attaching the handle and installing the grass bag, which most users complete in under 30 minutes. The push-button start means there's no priming, choking, or fuel mixing needed before first use.
Fully charge the battery before the first use to calibrate the battery management system and maximize initial runtime
Fold and store the handle in the lowest position to minimize storage footprint in tight garages or sheds
Greenworks backs this mower with a 4-year warranty , well above the industry standard for cordless mowers , covering both the tool and battery. Always verify specific warranty terms and registration requirements on the Greenworks website at time of purchase.
FAQ
How long does the battery last on the Greenworks 80V 21" lawn mower?
Runtime depends on grass thickness and terrain, but most users report 15-20 minutes per charge with the included 4.0Ah battery. That's typically enough for a 1/4 acre yard in a single charge.
For larger yards, having a second 80V 4.0Ah battery on hand is a practical solution since the rapid charger will replenish a depleted battery while you continue mowing with the spare.
Is the Greenworks 80V mower self-propelled?
No , this is a push mower, meaning the operator provides all forward movement. It works well on flat to gently rolling terrain, but at 68.3 lbs it requires noticeable effort on steeper slopes.
If your yard has significant hills, consider the Greenworks 80V self-propelled model or a lighter cordless option.
Can this mower handle tall or overgrown grass?
Yes , the 80V brushless motor is one of the most powerful in the cordless walk-behind category, and customers specifically praise its performance in tall grass. For very overgrown areas, mow at a higher cutting height first, then lower to your target height on a second pass to avoid bogging down the motor or reducing battery runtime.
Does the 80V battery work with other Greenworks tools?
Yes , the 80V battery platform is compatible with 75+ Greenworks tools, including blowers, trimmers, chainsaws, and snow blowers. If you're building out a cordless outdoor tool collection, investing in this platform lets you share batteries across multiple tools rather than managing separate battery ecosystems.
What discharge options does the Greenworks 80V 21" mower support?
This mower supports all three discharge modes: mulching (returning clippings to the lawn as fertilizer), side discharge (expelling clippings to the side for fast mowing), and rear bagging (collecting clippings in the included bag for clean disposal). Only about 16% of mowers in this category offer all three options, making this a notably versatile setup.
How does the LED headlight work and is it useful?
The LED headlights are built into the mower deck and activate with the mower, illuminating the cutting path ahead. This is genuinely useful for early-morning or late-evening mowing when light is low , a feature typically found only on higher-end cordless mowers.
It's also helpful in shaded yard areas where tree cover reduces visibility during the day.
Bottom Line
The Greenworks 80V 21" Brushless Cordless Lawn Mower is a premium cordless option that earns its tier with an unusually powerful 80V motor, a wide 21-inch steel deck, flexible 3-in-1 discharge, and a generous 4-year warranty , all with zero fuel maintenance. It's the right call for flat-to-moderate yards up to 1/2 acre where eco-friendly, low-maintenance operation matters most.
Operators with hilly terrain or very large properties should look at self-propelled models or dual-battery configurations.
Best for flat suburban yards up to 1/2 acre where gas-free, low-maintenance, high-power cordless cutting is the priority.
Consider alternatives if your yard has steep hills, exceeds 1/2 acre on a single charge, or you need self-propelled drive to reduce operator effort.
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