Greenworks 80V 21" Brushless Cordless (S vs SENIX Gas Lawn Mower, 22" Self Propelled
Quick Verdict
For most homeowners, the Greenworks 80V 21" Brushless Cordless is the better choice if you value quiet operation, low maintenance, and reliable self-propelled performance on yards up to 1/2 acre. The SENIX 22" Self Propelled Gas wins for larger properties or uneven terrain where raw power and longer runtime without recharging are priorities—and at a significantly lower price.
Side-by-Side
| Feature | Greenworks 80V 21" | SENIX 22" Gas |
|---|---|---|
| Price | $559.99 | $395.10 |
| Power Source | 80V battery (brushless motor) | Gas engine (17″? likely 170cc class) |
| Cut Width | 21 inches | 22 inches |
| Self-Propelled | Yes | Yes |
| Best Yard Size | Up to 1/2 acre | 1/2 acre or larger |
| Weight | ~55 lbs (with battery) | ~65–75 lbs (with fuel/oil) |
| Noise Level | Low (electric) | High (gas engine) |
| Maintenance | None (no oil, fuel, spark plugs) | Oil changes, fuel stabilizer, air filter |
Where Greenworks Wins
Zero emissions and quiet operation. The 80V brushless motor produces no exhaust and runs at a volume comparable to a vacuum cleaner—ideal for early mornings or noise-sensitive neighborhoods. There are no pull cords, no gas to mix, and no oil to change. The brushless design also means longer motor life and more efficient power delivery.
Lighter and easier to maneuver. At roughly 55 pounds, the Greenworks is noticeably lighter than most gas mowers, making it easier to turn, lift, and store. The self-propelled system is responsive and adjustable, with variable speed control to match your walking pace.
Better user ratings. With a 4.4/5 average from 1,696 reviews, owners consistently praise its reliability, cutting performance, and battery life. The 80V platform also shares batteries with other Greenworks tools (trimmers, blowers, chainsaws), adding value if you already own them.
Instant start and stop. No priming, choking, or waiting for the engine to warm up—just press a button and go. Releasing the safety bar stops the blade instantly, a safety advantage over gas mowers that require a few seconds to stop.
Where SENIX Wins
Lower upfront cost. At $395.10, the SENIX is about $165 cheaper than the Greenworks. That savings can cover a replacement battery or extra gas for years. For budget-conscious buyers, the lower price is a strong draw.
Unlimited runtime with gas. As long as you have fuel, the SENIX runs continuously. No need to wait for battery recharges or buy extra batteries for larger yards. For properties over 1/2 acre, gas mowers avoid the “second battery” cost and downtime.
Wider 22-inch cutting deck. An extra inch of cut width means fewer passes to finish the lawn—a small but real time-saver on larger or open spaces. The gas engine also delivers consistent torque through thick, wet grass without bogging down, something battery mowers can struggle with on heavy growth.
Proven gas power for tough conditions. Gas engines typically maintain full power even as the fuel level drops, whereas battery mowers gradually lose power as the charge depletes. For uneven terrain, hills, or tall grass, the SENIX’s gas engine provides reliable, sustained torque.
Which Should You Buy
Choose the Greenworks 80V if your lawn is 1/2 acre or smaller, you want a