If you've been pushing a mower across your yard every week and wondering whether self-propelled is worth the extra money, the short answer is: for a lot of Canadian homeowners, yes. But not for everyone. The longer answer depends on your yard, your budget, and how much you enjoy (or hate) the physical effort of mowing.
This post takes a deep look at the Greenworks 80V 21″ Brushless Self-Propelled Mower — the flagship in the Greenworks walk-behind lineup — and helps you decide whether it's the right upgrade.
What Self-Propelled Actually Means
A self-propelled mower uses part of its motor power to turn the rear wheels. You engage the drive by squeezing a lever on the handle, and the mower moves forward on its own. You steer, you control the pace, you decide when to stop — but you're not pushing 50+ pounds of mower through thick grass with your legs and shoulders.
The Greenworks 80V self-propelled model uses a rear-wheel drive system with variable speed. This means you can adjust the drive speed to match your walking pace, whether you're moving briskly across open lawn or carefully navigating around a flower bed.
The Greenworks 80V Self-Propelled: What You Get
This mower is built around the 80V battery platform — the most powerful residential platform Greenworks offers. The brushless motor delivers sustained high torque to both the 21-inch steel cutting deck and the rear-wheel drive system. Here's what stands out.
21-inch steel deck. Wider than the 17-inch push models, so you cover more ground per pass. Steel is heavier than poly, but it's more durable and handles rocky or uneven terrain without cracking.
SmartCut technology. The mower automatically senses grass thickness and adjusts motor power. In thin areas, it throttles down to conserve battery. When it hits a thick patch or overgrown section, it ramps up power to maintain a clean cut. You don't have to think about it.
7 cutting heights. From low-cut putting-green style to tall fescue heights, you can dial in exactly the length you want for each season.
3-in-1 cutting system. Mulch, bag, or side-discharge depending on conditions. Mulching returns nutrients to the soil and eliminates bagging. Side discharge is useful for very tall or wet grass. Bagging gives you the cleanest finish.
80V battery interchangeability. The same battery powers Greenworks 80V blowers, chainsaws, string trimmers, snow blowers, and more. One battery investment covers your entire yard tool kit.
Who Should Upgrade to Self-Propelled
You have slopes or hills. Any yard with noticeable grade changes is dramatically easier with self-propelled drive. Pushing a heavy mower uphill every week wears you out. Self-propelled drive handles inclines without breaking a sweat.
Your yard is over 5,000 square feet. Larger yards mean more walking, more pushing, and more fatigue. Self-propelled drive turns a 45-minute workout into a 30-minute task.
You mow frequently. If you mow weekly from May through September — roughly 20 to 22 sessions per year in most of Canada — the cumulative effort of pushing adds up. Self-propelled drive makes each session more comfortable, which makes you more likely to stick to a consistent mowing schedule.
You want the widest deck available in a walk-behind. At 21 inches, the self-propelled model is three to four inches wider than most push models. Fewer passes per mow means less time outside and less total distance walked.
Who Should Stick With a Push Mower
Your yard is small and flat. Under 5,000 square feet with no meaningful hills, a Greenworks 48V 17″ Push Mower handles the job comfortably. The weight savings and lower price make it the smarter buy for compact lots.
Budget is a priority. Self-propelled mowers cost more — both for the mower itself and for the higher-voltage battery platform. If you're outfitting a new home and buying multiple tools, the savings from a push mower can fund a blower or trimmer on the same battery platform.
You enjoy the exercise. Pushing a mower for 30 minutes is a legitimate low-impact workout. If that's a feature for you, not a bug, a push mower is the right call.
Runtime Expectations
Self-propelled mowers use more battery than push mowers because the motor powers both the blade and the wheels. Expect roughly 30 to 40 minutes of runtime on a single 4.0Ah 80V battery, depending on grass conditions and drive speed. For yards that take longer, a second battery eliminates downtime — charge one while you mow with the other.
SmartCut technology helps here. By throttling down motor power in easier sections, it stretches runtime significantly compared to mowers that run at constant full power.
The Verdict
The Greenworks 80V 21″ Self-Propelled Mower is the best walk-behind battery mower Greenworks makes. For yards over 5,000 square feet, yards with any slope, or anyone who values comfort over cost, it's worth every dollar. For smaller, flatter yards, a push mower on the 48V platform gets the job done at a lower price. Either way, you're getting Greenworks quality and battery interchangeability.