SUNTEK SLM4521A Battery Powered Self-Propelled Lawn Mower (21-Inch, 40V, 4.0Ah Battery, App Compatible)
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MEDIOCRE
62
Winnowl Index
Winnowl Verdict
Our product audit of the SUNTEK SLM4521A Battery Powered Self-Propelled Lawn Mower positions it at a MEDIOCRE (62) Winnowl Index, where the price and capability sit at or above average. The Fair Value index combined with the 40 brand strength from SUNTEK and an Average Performance rating is a balanced purchase. The Total Run Time of 68 minutes is above the 52.85 and means you should have plenty of power to handle larger yards or overgrown grass that would typically drain a standard battery, while on the lower end the Battery Voltage is below the class average and may mean you should effectively maintain blade speed on a tidy, dry lawn that gets mowed on a regular schedule. We recommend staying with this purchase; it captures 2% better cost to Performance than the standard entry in this class.
Market Value Index
Fair
$629.99
Overpriced
Fair
High Value
Our audit highlights Fair Value, as the utility you get for a $629.99 investment beats the class average by 2%.
Performance Rating
Average
With an Average Performance rating, the 68 minutes Total Run Time indicates you should have plenty of power to handle larger yards or overgrown grass that would typically drain a standard battery; and with the 40 V Battery Voltage, you should effectively maintain blade speed on a tidy, dry lawn that gets mowed on a regular schedule.
Brand Strength
Average
SUNTEK has Average Brand Strength, backed by Mediocre Brand Trust and Strong Brand Reliability.
Available At
$629.99
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The Winnowl Lab Report
| Specification | Value | Rating | Vs. Average | Winnowl Insight |
|---|---|---|---|---|
| Total Run Time | 68 minutes | Average | 18% better | High-endurance rating. Provides a safety buffer for thick grass or larger properties. |
| Battery Voltage | 40 V | Mediocre | 28% worse | Standard residential power. Balanced for consistent performance on well-maintained suburban lawns. |
| Battery Capacity | 4 Ah | Mediocre | 32% worse | Standard suburban capacity. Balanced for roughly 45-60 minutes of runtime. |
| Warranty | 3 Years | Mediocre | 22% worse | Standard residential protection. Covers the machine through the initial years of typical seasonal use. |
| Charging Time | 60 mins | Average | 39% better | Standard residential charge rate. Balanced for typical weekly maintenance schedules. |
| Number of Batteries | 2 count | Average | 18% better | Dual-battery loadout. Provides immediate redundancy and extended runtime for larger properties. |
| Cutting Width | 21 inches | Average | Average | Standard residential deck width. Balanced for efficiency and maneuverability through most garden gates. |
| Cutting Height Adjustment | 7 settings | Average | Average | High-precision adjustment rack. Allows for fine-tuning based on grass species and regional moisture levels. |
Ranking Factors
Insights
- Value Rank: #52 out of 75.
- Performance Rank: #53 out of 75.
- Winnowl Quadrant: Budget
Strengths
- At mins, the Charging Time is faster than the class average (98.21 mins) but not as fast as some products at (30 mins).
Neutral
- A Cutting Width of inches is about average (21.21 inches) but narrower than the widest in class at 26 inches.
- A Total Run Time of minutes is about average (57.45 minutes) but not as long as the class max of 150 minutes.
- A Cutting Height Adjustment of settings is about average (7.01 settings) but not as many as the class max of 10 settings.
- battery(s) is about average 1.69count but below the most in class (4 count).
Weaknesses
- At V, the Battery Voltage is below the average of 55.55 V and well below the highest in class at 84 V.
- The Years warranty is in the bottom 10%, offering minimal long-term protection.
- Ah is among the lowest capacities in class, ranking in the bottom 10%.
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SUNTEK SLM4521A Battery Powered Self-Propelled Lawn Mower |
MEDIOCRE
62
|
Fair | Average | Average | $629.99 | 68 minutes | 40 V | 4 Ah | 21 inches | 3 Years | 60 mins | 2 count | 7 settings |
| Kobalt 80-Volt 21-in Self-propelled Battery Lawn Mower |
STRONG
88
|
Exceptional | Strong | Exceptional | $599.00 | 75 minutes | 80 V | 5 Ah | 21 inches | 5 Years | 60 mins | 2 count | 7 settings |
| EGO Power+ LM2156SP-2 Battery Powered Self-Propelled Lawn Mower |
STRONG
80
|
Weak | Strong | Strong | $1,399.00 | 150 minutes | 56 V | 10 Ah | 21 inches | 5 Years | 60 mins | 2 count | 7 settings |
| LiTHELi 18-Inch Brushless Self-Propelled Mower |
MEDIOCRE
68
|
Exceptional | Average | Average | $276.59 | 50 minutes | 40 V | 4 Ah | 18 inches | 5 Years | 120 mins | 2 count | 6 settings |
Rankings
