Greenworks
Greenworks 40V 20-Inch Twin Blade Mower: Specs & Analysis
The Greenworks 40V 20" Twin Blade push mower delivers above-average 70-minute runtime on its dual-battery setup, making it one of the more capable cordless 20-inch options in its class. The twin-blade cutting system handles mulching and rear bagging on yards up to 14,520 sq ft, all without the noise, fumes, or maintenance headaches of a gas engine.
It's best suited to homeowners with small-to-medium flat lawns who want a lightweight, easy-start electric mower that genuinely gets the job done.
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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.
70-Minute Runtime
Above-average runtime (database avg: 52.7 min)
Considerations
Plastic Cutting Deck
Lightweight but less durable than steel; won't rust
Why We Recommend It
- 01.
70-minute combined runtime from two included batteries (4.0Ah + 2.0Ah) , 33% longer than the average cordless mower in its class
- 02.
Twin-blade 20" plastic deck cuts evenly and handles tall, wet grass according to verified customer feedback
- 03.
Lightweight at 42.5 lbs with easy one-handed push maneuverability , great for navigating around trees and landscaping
- 04.
Push-button auto start , no pull cord, no fuel mixing, and no seasonal carburetor headaches
- 05.
Both mulching and rear-bag discharge included, giving flexibility for different lawn conditions
Considerations
- 01.
Plastic cutting deck is lighter and rust-proof but less impact-resistant than steel decks found on heavier-duty mowers
- 02.
Push-only design with no self-propelled drive means more physical effort on larger or slightly sloped yards
- 03.
Battery life receives mixed reviews , runtime may vary significantly depending on grass thickness and conditions
Technical Specifications
| Feature | Specification |
|---|---|
| Mower Type | Push |
| Power Source | Battery |
| Cutting Width | 20" |
| Deck Material | Plastic |
| Battery | 40V |
| Runtime | 70 min |
| Discharge | Mulch, Bag |
| Weight | 42.5 lbs |
| Start Type | Auto |
Power & Performance
The 40V platform provides ample power for a push mower in this class, handling standard cool-season and warm-season grasses with ease. Customer feedback confirms it cuts through tall wet grass effectively , a real test of battery-powered torque that many entry-level cordless mowers struggle with.
The dual-battery system not only extends runtime but helps sustain consistent power under heavier cutting loads.
Cutting System
The 20" plastic deck houses twin blades, which improve cut quality and grass throughput compared to single-blade designs at the same deck width. Discharge options include mulching (returning clippings to the lawn as natural fertilizer) and rear bagging for a cleaner finish.
The 20-inch cutting width is well-matched to small and medium yards , wide enough for efficiency, narrow enough to navigate tight gates and landscaped borders.
Drive & Handling
At 42.5 lbs this is a genuinely lightweight mower , customers specifically note it can be pushed comfortably with one hand, which matters when steering around trees, flower beds, and tight corners. There is no self-propelled drive, so the operator provides all forward motion; on flat ground this is no issue, but on hills it adds real physical effort.
The push-mower format also keeps the design simple, with fewer mechanical parts to wear or service.
Battery / Fuel
The package includes both a 4.0Ah and a 2.0Ah 40V battery, delivering a combined 70 minutes of runtime , meaningfully above the 52.7-minute database average for cordless lawn mowers. Real-world runtime will vary based on grass height, density, and moisture, which is reflected in mixed customer battery reviews.
Charging time and compatibility with the broader Greenworks 40V platform are worth confirming if you plan to share batteries across tools.
Who Is This Mower For?
Ideal For
- ✓ Homeowners with flat yards up to 14,520 sq ft (~1/3 acre) who want a reliable cordless mower without cords limiting range
- ✓ Eco-conscious users who want zero direct emissions and quieter operation compared to any gas push mower
- ✓ Low-maintenance-focused owners , no oil changes, spark plugs, air filters, or fuel system work required
- ✓ Anyone upgrading from a corded electric mower who wants the freedom of battery power with above-average 70-minute runtime
Not Ideal For
- ✕ Owners with steep or hilly terrain , the push-only design without self-propelled drive makes slopes significantly harder work
- ✕ Large property owners over 1/3 acre who need consistent full-charge runtime without managing battery swaps mid-mow
- ✕ Users who need a heavy-duty steel deck for rough, obstacle-heavy yards where durability under impact is a priority
This mower ships ready to use with no assembly required , attach the handle, charge the batteries, and start cutting. The auto-start push-button system means there is zero learning curve for first-time electric mower owners.
Charge both batteries fully before the first use to establish accurate runtime expectations for your specific lawn conditions
Start with the 4.0Ah battery for the main mow, then swap to the 2.0Ah for finishing edges or a second pass , this maximizes consistent cutting power throughout the session
Greenworks is an established battery-powered outdoor tools brand with a documented warranty program; specific coverage terms for this model should be confirmed directly with Greenworks or the retailer at time of purchase, as warranty duration can vary by product generation and region.
FAQ
How long does the battery last on the Greenworks 40V 20" mower?
The mower comes with two batteries , a 4.0Ah and a 2.0Ah , providing a combined 70 minutes of rated runtime, which is above average for cordless push mowers. In practice, runtime varies based on grass thickness, height, and moisture; thick or wet grass will drain the battery faster than a clean weekly cut on a dry lawn.
Is the Greenworks 40V 20" mower self-propelled?
No , this is a push mower, meaning you provide all forward motion manually. At 42.5 lbs it's light enough that most users find it easy to push, and customers specifically note one-handed maneuverability on flat ground.
If your yard has significant slopes, a self-propelled model would be more comfortable for extended mowing sessions.
Can this mower handle tall or wet grass?
Yes , customer feedback confirms the twin-blade 20" cutting system cuts through tall wet grass effectively, which is a genuine strength for a battery-powered mower. For best results and battery efficiency, mow at the highest cutting height setting first if grass is significantly overgrown, then lower the deck for a second pass.
Does the Greenworks 40V mower mulch clippings?
Yes , it supports both mulching and rear-bag discharge, and the twin-blade design helps chop clippings finely for better mulch quality. Mulching returns nutrients to the soil and eliminates bagging trips, while the included rear bag is handy when you want a clean, clipping-free finish.
How big of a yard can this cordless 20" mower handle?
Greenworks rates it for yards up to 14,520 sq ft (roughly 1/3 acre) on a full charge with both batteries. For flat, well-maintained lawns this is a reasonable estimate; dense, tall, or frequently missed grass will reduce effective coverage.
The dual-battery setup with 70 minutes of combined runtime makes it one of the more capable options in the 20-inch cordless push mower category for medium-sized properties.
How does the Greenworks 40V compare to a gas push mower for everyday use?
For standard weekly mowing of small to medium flat yards, the Greenworks 40V is quieter, lighter, and dramatically lower maintenance , no oil changes, no spark plugs, no fuel storage, and no pull-cord frustration. The tradeoff is that you're managing battery charge rather than just filling a tank, and raw power under heavy cutting loads favors gas.
For most suburban homeowners with maintained lawns, the cordless electric experience is equal or better day-to-day.
Bottom Line
The Greenworks 40V 20" Twin Blade push mower is a well-rounded cordless option for flat small-to-medium yards, backed by above-average 70-minute runtime and a lightweight design that makes weekly mowing genuinely easy. The push-only format and plastic deck set realistic limits , this isn't a machine for hills, rough terrain, or large acreage , but within its intended use case it delivers quiet, emission-free, low-maintenance performance that gas mowers simply can't match.
Eco-conscious homeowners and anyone tired of pull-cord engines will find a lot to like here.
Best for flat suburban yards up to 1/3 acre where low maintenance, quiet operation, and zero emissions matter more than raw gas-engine power.
Consider alternatives if your yard has significant slopes, your grass is consistently thick and overgrown, or you need a larger cutting deck for properties over 14,500 sq ft.
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