Greenworks 40V 21" Brushless Cordless (S vs PowerSmart Self Propelled Gas Lawn Mower
Quick Verdict
The Greenworks 40V 21" Brushless Cordless Self-Propelled Mower is the better choice for smaller, quieter, low-maintenance yards, especially if you value convenience and zero emissions. The PowerSmart Self Propelled Gas Lawn Mower with its 170cc OHV engine is the winner for larger yards (over 1/4 acre) where raw cutting power and run-time without recharging are critical. Both earn a 4.1/5 rating, but appeal to different use cases.
Side-by-Side
| Feature | Greenworks 40V 21" | PowerSmart 22" 170cc Gas |
|---|---|---|
| Price | $399.99 | $349.99 |
| Power Source | 40V Battery (Brushless) | 170cc OHV Gas Engine |
| Cutting Width | 21 inches | 22 inches |
| Self-Propelled | Yes | Yes |
| Best Yard Size | Up to 1/4 acre | 1/4 to 1/2 acre |
| Noise Level | Quiet | Loud |
| Maintenance | Minimal (no oil/gas) | Oil changes, spark plugs, fuel |
| Emissions | Zero | Gas fumes & exhaust |
Where Greenworks Wins
Lower Noise & Emissions – The Greenworks runs on a brushless 40V motor, producing minimal noise compared to a gas engine. You can mow early or late without disturbing neighbors, and there are no exhaust fumes to breathe.
Instant Start & Low Maintenance – No priming, pulling a cord, or winterizing. Press a button and mow. No oil changes, air filter cleaning, or fuel stabilizer needed. The brushless motor also extends battery life and requires no brush replacements.
Lighter & Easier Handling – Cordless mowers are generally lighter than gas models. The Greenworks self-propelled feature works well on flat to moderate slopes, and the 21-inch deck is maneuverable in tight spaces.
Better for Small Yards – With a 40V battery, runtime is enough for up to 1/4 acre on a single charge. The lack of fuel and oil makes storage simple—hang it in the garage without worrying about spills or stale gas.
Where PowerSmart Wins
Unlimited Run-Time – The 170cc OHV gas engine can run as long as you have fuel. For yards larger than 1/4 acre, or if you have tough, overgrown grass, the PowerSmart won’t stop mid-mow to recharge.
More Cutting Power – The 170cc engine provides higher torque and blade speed, making it better for thick, wet, or tall grass. The 22-inch cutting width also covers slightly more ground per pass, reducing mowing time on larger lawns.
Lower Upfront Cost – At $349.99, the PowerSmart is $50 cheaper than the Greenworks. If you have a large yard and don’t mind gas maintenance, this is a more budget-friendly option for the power it delivers.
Proven Fuel Infrastructure – Gas is widely available, and you can keep extra cans on hand. No waiting for a battery to recharge—just refill and keep going.
Which Should You Buy
Choose the Greenworks 40V 21" if:
- Your yard is 1/4 acre or smaller.
- You want quiet, clean operation with minimal maintenance.
- You prefer push-button start and no gas/oil handling.
- You have a standard suburban lot with moderate grass conditions.
Choose the PowerSmart 22" 170cc if:
- Your yard is larger than 1/4 acre (up to 1/2 acre or more).
- You need raw power for thick, wet, or neglected grass.
- You are comfortable with gas engine upkeep (oil changes, fuel