Greenworks 40V 21" Brushless Cordless (Self-Propelled) Lawn Mower (75+ Compatible Tools), 5.0Ah Battery and Charger Included

Name: Greenworks 40V 21" Brushless Cordless (Self-Propelled) Lawn Mower (75+ Compatible Tools), 5.0Ah Battery and Charger Included
Brand: Greenworks
SKU: MO40L421

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Greenworks | Battery Powered Self-Propelled Lawn Mowers

MEDIOCRE

Winnowl Index

Winnowl Verdict

Even though the Greenworks 40V 21" Brushless Cordless (Self-Propelled) Lawn Mower just cleared our audit with a LAGGING (65) Winnowl Index, that score is really a sign that you're paying for the name on the box more than the actual features you're getting. You’re looking at an Average Performance and Mediocre Value product here, but it’s coming from a company with Strong Brand Strength, so you're definitely paying a premium just for that name on the box. If you're looking at the Greenworks 40V 21" Brushless Cordless (Self-Propelled) Lawn Mower (75+ Compatible Tools), 5.0Ah Battery and Charger Included, the specs show that you will likely be able to mow a typical front and back yard on one charge without having to stop to find a charger simply because that Total Run Time of 45 minutes sits 18% below the class average. Honestly, we’d suggest a hard pivot from this Brand Tax product; that 14% higher price tag results in 10% less hardware for your dollar than the class average, so you're really not getting much for the extra cash.

Market Value Index

Mediocre

$479.99

Overpriced Fair High Value

The Mediocre Value rating identifies a "Logo Tax" where the $479.99 cost is 10% less efficient than the $557.27 class average.

Performance Rating

Average

Strengths

Neutrals

Weaknesses

Honestly, compared to other options out there, this product's performance is 22% below the average and earns an Average Performance rating. While the Cutting Height Adjustment indicates you should be able to dial in the exact height needed for your specific grass type as the weather and seasons change, the big catch is that the 45 minutes Total Run Time means that you will likely be able to mow a typical front and back yard on one charge without having to stop to find a charger is something you'll just have to deal with.

Brand Strength

Strong

Trust

Reliability

Customer Service

Data for Greenworks confirms Strong Brand Strength; while the Average Brand Trust and Average Brand Reliability are top-tier, make sure the Performance and Value meets your needs.

Available At

$479.99 View Deal

The Winnowl Lab Report

Specification	Value	Rating	Vs. Average	Winnowl Insight
Total Run Time	45 minutes	Mediocre	19% worse	Standard suburban endurance. Rated for roughly 1/4 acre under normal conditions.
Battery Voltage	40 V	Mediocre	34% worse	Standard residential power. Balanced for consistent performance on well-maintained suburban lawns.
Charging Time	150 mins	Weak	81% worse	Extended recovery time. Slow recharge speed may delay your ability to finish larger jobs.
Warranty	3 Years	Mediocre	22% worse	Standard residential protection. Covers the machine through the initial years of typical seasonal use.
Number of Batteries	1 count	Average	39% worse	Standard single-battery kit. Ideal for standard suburban lots that can be finished in one session.
Battery Capacity	5 Ah	Average	8% worse	Standard suburban capacity. Balanced for roughly 45-60 minutes of runtime.
Cutting Width	21 inches	Average	2% worse	Standard residential deck width. Balanced for efficiency and maneuverability through most garden gates.
Cutting Height Adjustment	7 settings	Average	3% better	High-precision adjustment rack. Allows for fine-tuning based on grass species and regional moisture levels.

Ranking Factors

Insights

Value Rank: #40 out of 40.
Performance Rank: #40 out of 40.
Winnowl Quadrant: Budget

Neutral

A Battery Capacity of Ah is about average 5.46 Ah but below the class max of 12 Ah.
A Cutting Width of inches is about average (21.40 inches) but narrower than the widest in class at 26 inches.
A Total Run Time of minutes is about average (55.78 minutes) but not as long as the class max of 90 minutes.
A Cutting Height Adjustment of settings is about average (6.80 settings) but not as many as the class max of 10 settings.

Weaknesses

The Years warranty is in the bottom 10%, offering minimal long-term protection.
At V, the voltage is in the bottom 10%, indicating lower power potential than most peers.
The mins charge time is in the slowest 10% for this class.
At only battery, this is in the bottom 10% for included power components.

Comparison

Name	Winnowl Index	Value	Performance	Brand	Price	Total Run Time	Battery Voltage	Battery Capacity	Cutting Width	Warranty	Charging Time	Number of Batteries	Cutting Height Adjustment
Greenworks 40V 21" Brushless Cordless (Self-Propelled) Lawn Mower	MEDIOCRE 65	Mediocre	Average	Strong	$479.99	45 minutes	40 V	5 Ah	21 inches	3 Years	150 mins	1 count	7 settings
Kobalt 80-Volt 21-in Self-propelled Battery Lawn Mower	ELITE 91	Strong	Strong	Exceptional	$599.00	75 minutes	80 V	5 Ah	21 inches	5 Years	60 mins	2 count	7 settings
Greenworks 82V 25” Battery Powered Lawn Mower	STRONG 85	Fair	Strong	Strong	$699.99	90 minutes	82 V	4 Ah	25 inches	4 Years	60 mins	2 count	7 settings
PowerSmart 80V MAX 21" Cordless Lawn Mower	AVERAGE 78	Exceptional	Strong	Average	$329.00	60 minutes	80 V	6 Ah	21 inches	2 Years	90 mins	1 count	5 settings