RB 40V 13-Inch Brushless Cordless Lawn Mower with 4.0Ah Lithium Battery & Fast Charger, 2-in-1 Lightweight Mower for Small Yards, Foldable Handle, 5 Cutting Height Adjustments

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RB | Battery Powered Push Lawn Mowers

MEDIOCRE

Winnowl Index

Winnowl Verdict

The RB 40V 13-Inch Brushless Cordless Lawn Mower currently holds a LAGGING (59) Winnowl Index, signaling a major red flag to watch out for this Ghost Brand. Sure, the Mediocre Value makes it look like a bargain, but the combination of Average Performance and Average Brand Strength is a major red flag—it’s a hard pass from us since there’s no track record to back up the product. As you can see from the Average Brand Strength—this is a total "Ghost Brand" with no website or easy way to return it; not to mention the specs which are 15% below the average. We’d definitely recommend a hard pivot from this Ghost Trap; you’re much better off putting your money toward a brand that’s known for better performance and won't let you down on reliability.

Market Value Index

Mediocre

$209.99

Overpriced Fair High Value

The Mediocre Value rating at the $209.99 price is 7% more efficient than the $232.67 baseline.

Performance Rating

Average

Strengths

Neutrals

Weaknesses

With an Average Performance rating, the specs are 15% below the average; for example the 35 minutes Total Run Time acts as a bottleneck that lags 37% behind the class and means you should be able to manage a typical quarter-acre property on a single charge if the grass is dry and maintained.

Brand Strength

Average

Trust

Reliability

Customer Service

Research on RB shows its missing a website and proper Customer Service channel and earns an Average Brand Strength score due to the Mediocre Brand Trust and Average Brand Reliability.

Available At

$209.99 View Deal

The Winnowl Lab Report

Specification	Value	Rating	Vs. Average	Winnowl Insight
Total Run Time	35 minutes	Average	15% worse	Standard duty cycle. This endurance level matches the average residential mowing session for most homeowners.
Cutting Width	13 inches	Mediocre	20% worse
Number of Batteries	1 count	Mediocre	33% worse	Single-pack baseline. This is the entry point for cordless mowers, providing no hot-swap capability for larger jobs.
Warranty	2 Years	Mediocre	31% worse	Standard industry protection. This coverage aligns with the market average and offers a fair level of consumer security.
Battery Capacity	4 Ah	Average	4% worse
Cutting Height Adjustment	5 settings	Average	10% worse	Standard precision. Offers enough variety to handle the transition from spring growth to summer dormancy.
Charging Time	120 mins	Average	5% worse	Slow-recovery charging. Common in value-tier bundles where the charger lacks active cooling or high-amperage circuitry.
Battery Voltage	40 V	Average	4% better	Standard residential output. This range represents the industry sweet spot for balancing battery weight with reliable cutting torque.

Ranking Factors

Insights

Value Rank: #35 out of 45.
Performance Rank: #39 out of 45.
Winnowl Quadrant: Budget

Neutral

A Battery Voltage of V is about average (38.53 V) but below the highest in class at 80 V.
A Battery Capacity of Ah is about average 4.18 Ah but below the class max of 6 Ah.
A Total Run Time of minutes is about average (41.22 minutes) but not as long as the class max of 70 minutes.
A Cutting Height Adjustment of settings is about average (5.58 settings) but not as many as the class max of 7 settings.
A Charging Time of mins is about average 114 mins but below the fastest at 50mins.

Weaknesses

Narrowest Cutting Width in its class at 13 inches, well below the widest in class at 21 inches.
At Years, the Warranty is shorter than the average of 2.89 Years and well below best in class (5Years).
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
RB 40V 13-Inch Brushless Cordless Lawn Mower	MEDIOCRE 59	Mediocre	Average	Average	$209.99	35 minutes	40 V	4 Ah	13 inches	2 Years	120 mins	1 count	5 settings
PowerSmart 80V MAX 21in. Cordless Push Lawn Mower	STRONG 83	Strong	Exceptional	Average	$299.99	60 minutes	80 V	6 Ah	21 inches	4 Years	75 mins	1 count	7 settings
MZK MZK 40V(2 x 20V) 13”Cordless Electric Lawn Mower	ELITE 45	Exceptional	Strong	Zero	$159.99	60 minutes	40 V	4 Ah	13 inches	2 Years	120 mins	2 count	4 settings