Best Greenworks 80V 21in Self-Propelled Lawn Mower
As an Amazon Associate we earn from qualifying purchases.
If you typed best greenworks 80v 21in self-propelled lawn mower into a search box, you want to know whether this battery mower suits your lawn and what its listing actually promises. The Greenworks 80V 21in Self-Propelled Lawn Mower (ASIN B0CLSC6B2T) is listed with a 21-inch deck, self-propelled rear-wheel drive, a 4.0 Ah battery and a charger. Its spec table gives a 20.28-inch cutting width and a 75-pound item weight. This post sticks to what the listing states, shows where its figures disagree, and names what it does not say.
Quick answer
- Consider it if one 4.0 Ah battery covers your whole mowing session. The listing says that battery cuts up to 1/2 acre, and it adds that the result varies with grass condition and operator technique.
- The listing states that the battery and charger are included, that the drive is self-propelled with rear-wheel drive, and that the warranty is a 4-year limited tool and battery warranty.
- Skip it if you need one confirmed weight or one confirmed cutting width. The listing gives 75 pounds in its spec field, lists battery weights separately, and shows a 21-inch deck next to a 20.28-inch cutting width.
- Read the electric-mower safety points before the first cut. The Ohio State factsheet says never to use an electric mower on wet grass, and the Illinois guide says to remove the battery before working near the blades.
The product at a glance
The table lists what the listing states. Where the listing is silent, the cell says “not stated”. Where two parts of the listing disagree, both values appear.
| Item | What the listing states |
|---|---|
| Brand | Greenworks (spec field) |
| Model number | not stated |
| Power source | Battery Powered (spec field) |
| Battery platform | 80V lithium-ion (variant table) |
| Battery and charger | Included with the 4.0 Ah battery (title and manufacturer section) |
| Battery options shown | 2.0 Ah, 4.0 Ah, 5.0 Ah and 8.0 Ah (variant table) |
| Watt-hour figures | 144, 288, 360 and 576 Wh for those four options (variant table) |
| Cutting width | 20.28 inches (spec field); 21-inch deck (title and bullet) |
| Cutting height range | not stated (the listing says only adjustable cutting height) |
| Drive | Self-propelled, rear-wheel drive, variable speed control (bullet) |
| Motor | Brushless (bullet) |
| Deck | Steel deck (variant table and bullet) |
| Light | LED headlight (bullet) |
| Item weight | 75 pounds (spec field) |
| Battery weights | 3.52, 4.58, 6.14 and 8.75 lbs across the four battery columns (variant table); mower-only weight not labelled |
| Dimensions | 67.72 in deep, 25.63 in wide, 40.95 in high (spec field) |
| Bagger | Listed as usable with or without a bagger; not stated as included |
| Operation mode | Automatic (spec field) |
| Runtime | Up to 1/2 acre on the 4.0 Ah battery, which the listing says varies (bullet) |
| Warranty | 4-year limited tool and battery warranty (bullet) |
Battery figures worked out from the listing
Watt-hours equal volts multiplied by amp-hours. Using the 80V label, the 4.0 Ah option works out to 80 x 4.0 = 320 Wh, but the listing gives 288 Wh. The table below does the same division for each battery option.
| Battery option | 80 V x Ah (Wh) | Listing figure (Wh) | Listing figure divided by 80 V x Ah |
|---|---|---|---|
| 2.0 Ah | 160 | 144 | 0.90 |
| 4.0 Ah | 320 | 288 | 0.90 |
| 5.0 Ah | 400 | 360 | 0.90 |
| 8.0 Ah | 640 | 576 | 0.90 |
Every listed figure is 90 percent of the simple product. The listing does not explain the 90 percent, so read the watt-hours as the listing’s own numbers, not as a capacity you can confirm on your own battery.
Who it suits
This mower fits a lawn the listing describes as up to one half acre, owned by someone who wants a self-propelled drive rather than pushing a heavy deck across the whole yard. The listing’s subtitle says the self-propelled drive reduces effort on larger lawns, which is the feature the subtitle puts first.
It also suits a buyer who already owns Greenworks 80V tools or plans to. The listing says the battery works with more than 75 Greenworks 80V tools, including trimmers, blowers and chainsaws, so one battery platform can serve several jobs in the same yard.
A simple geometry check helps. One acre is 43,560 square feet, so a half acre is 21,780 square feet. At the 21-inch deck width named in the title, that area is about 12,450 linear feet of cut path before any overlap, or roughly 2.4 miles. The listing gives no mowing speed, so this is path length, not a runtime. It still shows how much ground one battery charge has to cover.
Skip it if
Skip it if your lawn is clearly larger than the half acre the listing names. The listing gives no figure above that claim for the 4.0 Ah battery, and the 8.0 Ah option is shown without a runtime statement of its own.
Skip it if you need a confirmed mower-only weight before you lift it into a truck or carry it up steps. The spec field says 75 pounds, but the battery weights are shown separately and the mower alone is not labelled.
Skip it if you need a cutting height range to plan a particular grass height. The listing says the height is adjustable and gives no minimum or maximum.
Skip it if your garage space is tight. The listing’s dimensions are 67.72 inches deep, 25.63 inches wide and 40.95 inches high, and the listing does not describe a folded size.
Before the first cut
The three university and extension sources cited in this post give the same basic steps for any walk-behind mower. Read the operator’s manual first. Clear the lawn of sticks, pine cones and other debris that a blade can throw, and mow only when the grass is dry. The UF/IFAS guide says mowers are powerful machines with sharp blades that warrant careful handling, and it recommends eye and ear protection as a good idea. The Ohio State factsheet adds that self-propelled mowers should be taken out of gear before starting and that guards and safety shields should stay in place.
For this electric model, the Ohio State factsheet is the clearest rule. It says never to use an electric mower on wet grass. Wait until the grass is dry, even if the lawn is overgrown and you want to finish quickly. The Illinois Extension guide says that before you work near the blades on an electric mower, you should remove the battery to prevent accidental engagement of the blades.
The UF/IFAS guide also says that the blade should generally be sharpened at least twice a year, and more often depending on lawn size, grass type and how often you mow. A dull blade tears grass rather than cutting it, so check the blade before the season starts as part of the same routine.
What the listing does not say
The listing names a battery and charger, but it does not say how long a full charge takes, how many minutes a 4.0 Ah battery runs at a given cutting height, or what runtime the 5.0 Ah and 8.0 Ah options deliver on the same mower. The “up to 1/2 acre” line is marked as varying with grass condition and operator technique, so it is a range, not a promise.
The listing also leaves the cutting width unresolved. The title and a bullet describe a 21-inch deck, while the spec field gives a cutting width of 20.28 inches. The listing does not say which figure a buyer should rely on for planning passes across the lawn.
The motor is described as brushless and as giving more torque, and the bullets call the mower durable. The listing gives no torque figure and no independent evidence for longer life, so those words are the listing’s claims.
For a plain explanation of the volt and amp-hour labels you will see on this and other cordless mowers, read our guide to lawn mower battery voltage and amps. If you are weighing an electric mower with a different power route, see our review of the BLACK+DECKER BESTA512CM electric lawn mower.
Buying checklist
- Confirm the cutting width you will use for planning, because the listing shows both a 21-inch deck and a 20.28-inch cutting width.
- Ask the seller or the manufacturer for the mower-only weight, because the listing does not label it.
- Confirm which battery option is in the box. The title names the 4.0 Ah battery and charger, while the variant table lists four battery sizes.
- Check whether the bagger is included. The listing says the mower can be used with or without a bagger but does not say it comes with one.
- Measure your garage or shed against the stated dimensions before ordering.
- Read the full warranty text. The listing gives the 4-year limited tool and battery warranty as a summary only.
How we chose
This mower is in the post because ASIN B0CLSC6B2T is one of the Electric Mowers rows set for this batch, and its title names a 21-inch self-propelled 80V mower with a 4.0 Ah battery and charger. The stored product scan for this batch did not include this ASIN, so the listing was read once on 2026-10-23 (CHECKED date). We saved only its title, bullets and specification fields. We left out prices, customer feedback, badges and images. We did not rank this mower against other models, and the three non-listing sources cover the tool type, not a shortlist of brands.
What we could not verify
The listing and the three non-listing sources do not give this model’s runtime on a real lawn, its charge time, or how the 1/2-acre claim holds on thick grass or slopes. We could not verify the mower-only weight, because the listing gives 75 pounds in one field and battery weights in another without labelling the mower. We could not reconcile the 21-inch deck with the 20.28-inch cutting width. The cutting height range, the bagger contents and the warranty terms beyond the listing sentence are also not verified here.
FAQ
Does the Greenworks 80V 21in mower come with a battery and charger?
The listing says yes. Its title names a 4.0 Ah battery and charger, and the manufacturer section says the battery and charger are included. The variant table also shows 2.0 Ah, 5.0 Ah and 8.0 Ah battery options.
How much lawn can the 4.0 Ah battery cover?
The listing says the 4.0 Ah battery cuts up to 1/2 acre, and it adds that the result varies with grass condition and operator technique. A half acre is 21,780 square feet, which is about 12,450 linear feet of cut path at a 21-inch width. The listing gives no mowing speed, so that path length is geometry, not a runtime.
Is a 21-inch self-propelled mower a good fit for a small yard?
The listing does not describe a small-yard fit. Its stated coverage of up to 1/2 acre points to a mid-size lawn. The UF/IFAS guide says a manual reel or electric walk-behind mower could be just the ticket for a moderately sized yard, which is a general point about the tool type.
What weight should I expect for this mower?
The spec field says the item weight is 75 pounds. The variant table lists battery weights from 3.52 to 8.75 lbs, but it does not label a mower-only weight. Confirm the weight with the seller or the manufacturer before you plan any lifting.
Is it safe to mow wet grass with an electric mower?
The Ohio State factsheet says never to use an electric mower on wet grass. The UF/IFAS guide advises mowing only when the grass is dry. Wait for the lawn to dry before you start.
How often should the mower blade be sharpened?
The UF/IFAS guide says the blade should generally be sharpened at least twice a year, with more frequent sharpening for larger lawns, some grass types or frequent mowing. For an electric mower, remove the battery before working on the blade, as the Illinois Extension guide advises.
Does the listing say how long the mower runs on a charge?
The listing gives only the 1/2-acre claim for the 4.0 Ah battery, with the condition that results vary with grass and technique. It gives no minutes-per-charge figure. The watt-hour numbers in the variant table describe the batteries, not the time one full charge runs the mower.
Bottom line
Buy this mower only if one 4.0 Ah battery covers your mowing in a single session and you can live with unresolved weight and cutting-width figures. If your lawn is bigger than the half acre the listing names, or you need a confirmed mower-only weight before you buy, skip it.
Sources
- Greenworks 80V 21in Self-Propelled Lawn Mower, Amazon listing (opened 2026-10-23)
https://www.amazon.com/dp/B0CLSC6B2T - Lawn Mower Care and Safety, UF/IFAS Gardening Solutions (opened 2026-10-22)
https://gardeningsolutions.ifas.ufl.edu/care/tools-and-equipment/lawn-mower-care-and-safety/ - Mower Maintenance, Illinois Extension (opened 2026-10-22)
https://extension.illinois.edu/lawns/mower-maintenance - Power Lawn Mowers, Ohioline, The Ohio State University Extension (opened 2026-10-22)
https://ohioline.osu.edu/factsheet/aex-591210
