PowerSmart
PowerSmart 80V MAX 21" Cordless Lawn Mower: Complete Spec Analysis
The PowerSmart PS76821 delivers serious cordless cutting power with an 80V MAX brushless motor and a wide 21-inch steel deck , well above the walk-behind average of 18 inches. It's a low-maintenance, zero-emissions push mower best suited for medium-sized, flat to gently sloped yards where battery-powered convenience matters.
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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
80V Battery System
High-voltage platform for more power (database avg: 38.1V)
Why We Recommend It
- 01.
80V 6.0Ah lithium-ion battery delivers roughly 40 minutes of runtime , enough for most medium yards in a single charge
- 02.
21-inch steel deck provides a wide cutting path and long-term durability over plastic alternatives
- 03.
Brushless motor improves energy efficiency and motor longevity compared to brushed designs
- 04.
Six adjustable cutting height positions from 1.6 to 4.0 inches via central adjustment , quick and consistent
- 05.
Zero direct emissions and quieter operation than gas mowers; battery is compatible with other PowerSmart 80V tools like snowblowers
Considerations
- 01.
At 57.5 lbs, it's heavier than many lighter cordless competitors, which may matter on larger or hillier yards
- 02.
Rear protective flap durability has been flagged by some users, suggesting the plastic trim components may not match the steel deck's build quality
- 03.
Single battery included; if 40-minute runtime falls short for your yard, an additional 80V battery is an added investment
Technical Specifications
| Feature | Specification |
|---|---|
| Mower Type | Push |
| Power Source | Battery |
| Cutting Width | 21" |
| Deck Material | Steel |
| Blade Type | Rotary |
| Cutting Height | 1.6" – 4" |
| Height Positions | 6 |
| Battery | 80V 6Ah |
| Runtime | 40 min |
| Discharge | Mulch, Bag |
| Weight | 57.5 lbs |
| Start Type | Push button |
Power & Performance
The 80V MAX brushless motor puts this mower in a higher power tier than most residential cordless models, which commonly run on 40V or 60V platforms. Brushless motor technology means more torque delivered to the blade, better efficiency through the battery charge, and a longer motor lifespan.
In practice, this translates to cleaner cuts through thick or slightly overgrown grass that would bog down lower-voltage competitors.
Cutting System
The 21-inch rotary steel deck is a standout feature , three inches wider than the 18-inch walk-behind average , meaning fewer passes to cover the same area. Six centrally adjusted cutting height positions span 1.6 to 4.0 inches, covering everything from a tight lawn finish to a taller, drought-tolerant cut.
The 3-in-1 discharge system supports mulching (returning clippings as fertilizer), rear bagging (for a clean finish), and side discharge.
Drive & Handling
This is a push mower, so all forward motion comes from the operator. At 57.5 lbs, it's on the heavier side for a cordless push mower, which is manageable on flat ground but worth noting for anyone with slopes or a larger yard.
The handle and push-button start design prioritize ease of use, and customers consistently highlight the mower's lightweight feel relative to gas alternatives despite the scale weight.
Battery / Fuel
The included 80V 6.0Ah lithium-ion battery provides approximately 40 minutes of runtime per charge, with the charger included in the box. Runtime will vary based on grass height, density, and how consistently the blade is loaded.
Because this mower runs on the PowerSmart 80V MAX platform, the battery is interchangeable with compatible PowerSmart tools, adding value for existing ecosystem owners. Maintenance is minimal: no oil changes, no spark plug replacements, no fuel stabilizer , just charge and mow.
Who Is This Mower For?
Ideal For
- ✓ Homeowners with medium yards (roughly 1/4 to 1/2 acre) who want a wide 21-inch deck to cut efficiently without a gas engine
- ✓ Eco-conscious users who want zero direct emissions and quieter mowing without sacrificing cutting width or power
- ✓ PowerSmart 80V tool ecosystem owners who can share batteries across tools like snowblowers, reducing overall ownership investment
- ✓ Low-maintenance seekers who want push-button start and no oil, spark plugs, or carburetor to service
Not Ideal For
- ✕ Owners of hilly or steep terrain , this is a push mower with no self-propelled drive, and 57.5 lbs is demanding on inclines
- ✕ Large property owners exceeding 1/2 acre, where the 40-minute runtime may require mid-session recharging
- ✕ Users needing side discharge as a primary mode , mulching and rear bag are the confirmed discharge options, with side discharge listed but less prominently featured
PowerSmart lists this mower as requiring no assembly out of the box, which aligns with customer feedback describing it as easy to get started. Simply charge the included 6.0Ah battery, insert it, and press the button to start.
Charge the battery fully before first use to condition the cells and get the most accurate sense of your runtime on your specific yard
Set your cutting height before you begin , the central adjustment lever changes all four wheels simultaneously, making height setup quick
PowerSmart typically covers their 80V cordless tools with a manufacturer warranty, but specific terms for the PS76821 should be verified directly with PowerSmart at time of purchase, as coverage periods and conditions can vary by region and retailer.
FAQ
How long does the 80V 6.0Ah battery last on a single charge?
PowerSmart rates the included 80V 6.0Ah battery at approximately 40 minutes of runtime. In practice, runtime depends on grass thickness and density , dense or tall grass draws more power.
For most medium yards under 1/3 acre, one charge is typically sufficient for a full mow.
Is the PowerSmart PS76821 self-propelled?
No, the PS76821 is a push mower , the operator provides all forward motion. This keeps the design simpler and the tier lower, but it does mean more physical effort on slopes.
At 57.5 lbs, flat and gently sloped yards are manageable, but steep terrain would be tiring.
Can this mower mulch grass clippings?
Yes. The PS76821 is a 3-in-1 mower supporting mulching, rear bag discharge, and side discharge.
Mulching mode chops clippings finely and returns them to the lawn as natural fertilizer, reducing the need to bag and dispose of clippings.
Is the 80V battery compatible with other PowerSmart tools?
Yes , customers confirm the 80V MAX battery system is shared across PowerSmart's 80V platform, including snowblowers. If you already own PowerSmart 80V tools, the battery and charger from this mower can be used interchangeably, which adds real value to the ecosystem.
How does the cutting height adjustment work on the PS76821?
The PS76821 uses a central single-lever height adjustment that sets all wheels simultaneously. It offers 6 positions ranging from 1.6 to 4.0 inches, covering everything from a short, manicured finish to a taller cut better suited for summer heat or drought conditions.
How does the PowerSmart 80V mower compare to gas mowers for thick grass?
The 80V brushless motor delivers significantly more torque than lower-voltage cordless mowers and handles moderately thick grass well. While a high-displacement gas engine still has an edge in very heavy overgrowth, the PS76821's 80V platform closes that gap considerably compared to 40V or 60V alternatives , and eliminates the emissions, noise, and fuel maintenance of gas.
Bottom Line
The PowerSmart PS76821 is a well-rounded cordless push mower for homeowners who want gas-level power without the maintenance headaches. Its 80V brushless motor, 21-inch steel deck, and 3-in-1 discharge make it a versatile, eco-friendly choice for medium flat yards , but the lack of self-propulsion and 40-minute runtime cap mean it's not the right fit for hilly properties or larger lots.
Best for medium flat-to-gentle-slope yards wanting powerful, zero-emissions mowing with push-button simplicity and no fuel maintenance.
Consider alternatives if you have steep hills requiring self-propelled assist, or a large yard where 40 minutes of runtime would require a mid-mow recharge.
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