Why this product
The Ryobi 40V mower is the right cordless mower for buyers who do not need 21-inch coverage and who already own Ryobi 40V tools. The shared battery argument matters more than the spec sheet here. If your existing 40V trimmer, blower, and chainsaw are already sitting in the garage, adding the bare-tool version of this mower costs about $250, which makes the cordless mowing investment quickly recoverable.
I tested the Ryobi across our reference quarter-acre lot for a season alongside the EGO 56V and the Greenworks Pro 80V. On dry weekly maintenance mows the cut quality was indistinguishable to the eye. The Ryobi only fell behind on tall first-cut grass where the smaller 20-inch deck and 40V motor combination required more passes and more careful speed control to keep up.
What Ryobi claims
Ryobi markets the 40V brushless 20-inch self-propelled with a steel deck, three-in-one cut modes, a variable speed self-propel dial, and a 6 Ah included battery. They claim about 45 minutes of runtime per charge, a 5 year tool warranty, and a 3 year battery warranty. The kit ships with the rapid charger and a single 6 Ah pack.
The runtime claim was honest. We measured 44 minutes average across three runs at 3 inch cut height in dry grass at 70 F. Working noise at the operator ear position measured roughly 75 dB. Self-propel top speed measured 2.4 mph against a 100 ft path which is right at the 2.5 mph claim.
Who should buy
Buy the Ryobi 40V if:
- You own a quarter-acre lot and want a cordless mower under $400.
- You already own Ryobi 40V tools and want shared batteries.
- You value a 5 year tool warranty.
- You appreciate vertical storage to save garage space.
Skip the Ryobi 40V if:
- Your lot is half acre or larger. Step up to the Greenworks 80V or EGO 56V.
- You want the most refined operating feel in the class. EGO wins that test.
- You only mow a tiny suburban lot. The Sun Joe MJ401E corded mower handles that footprint at a fraction of the price.
Cut quality: clean on weekly mows
On dry fescue at 3 inch cut height the Ryobi produced clean, even cut tips with no visible tearing. The 20-inch deck is one inch narrower than the 21-inch class which means an extra pass or two on a quarter-acre lot. That sounds trivial. Across a season it adds about 4 to 6 minutes to a typical mow, which is real but not significant.
Tall first-cut grass exposed the gap with premium competitors. At full speed the brushless motor briefly bogged when fed aggressively, and the recovery time felt slightly slower than EGO’s. Slowing the dial to 50 percent fixed the issue, but it is a behavior to plan around. Mulching mode worked cleanly in normal weekly cuts. Bagging filled fast on tall grass which is consistent with the smaller bag capacity.
Self-propel and ergonomics
The variable-speed dial is functional rather than refined. Top speed at 2.4 mph is comfortable for most walking paces. Below 50 percent the unit feels almost coasting, which I appreciated near garden beds. The handle has slightly more vibration at full power than the premium 56V and 80V mowers in our test. Storage folding is straightforward with a single lever per side.
For our complete testing protocol see The Tested Hub methodology page.
Battery and runtime: 45 minutes is the right expectation
The 6 Ah 40V pack is the right pairing for this deck. We measured 44 to 45 minutes of cut time across three runs in dry grass. Wet tall grass dropped runtime to about 32 minutes. Cool weather at 50 F cost about 4 minutes versus 70 F testing.
The shared 40V battery platform is the structural advantage of buying into Ryobi. We have tested the Ryobi 40V string trimmer, and matching a future blower, chainsaw, or hedge trimmer is much cheaper if the batteries already live in the garage.
Build and durability after a season
The deck is steel and shows the normal grass-acid staining you would expect. The handle plastic showed minor wear at the lock points after the test season. Battery tested at about 93 percent of day-one capacity which is consistent with normal cycle wear. The 5 year tool warranty plus 3 year battery warranty matches EGO’s coverage which is strong for a value-priced unit.
Ryobi 40V Brushless 20-Inch Self-Propelled Mower vs. the competition
| Product | Our rating | Deck | Battery | Runtime | Price | Verdict |
|---|---|---|---|---|---|---|
| Ryobi 40V 20-Inch Brushless | ★★★★☆ 4.3 | 20 in | 40V 6 Ah | 45 min | $379 | Best Value Cordless |
| EGO 21-Inch Self-Propelled 56V | ★★★★★ 4.7 | 21 in | 56V 7.5 Ah | 60 min | $599 | Editor's Choice |
| Greenworks Pro 21-Inch 80V | ★★★★★ 4.5 | 21 in | 80V 5 Ah | 60 min | $449 | Top Pick Battery Mower |
| Generic 36V No-Brand | ★★★☆☆ 3.4 | 18 in | 36V 4 Ah | 25 min | $269 | Skip |
Full specifications
| Deck width | 20 inches steel |
| Voltage | 40V brushless |
| Battery (included) | 6.0 Ah lithium-ion |
| Runtime | About 45 minutes per charge |
| Cut heights | 1.5 to 4 inches, 7 positions |
| Mode | 3 in 1 (mulch, bag, side-discharge) |
| Self-propel | Variable speed up to 2.5 mph |
| Weight | About 70 lb with battery |
| Charger | Rapid charger included |
| Warranty | 5 year tool, 3 year battery |
Should you buy the Ryobi 40V Brushless 20-Inch Self-Propelled Mower?
The Ryobi 40V brushless 20-inch self-propelled mower is the right cordless mower for a quarter-acre lot and a budget. Runtime on the included 6 Ah pack lands around 45 minutes, the brushless motor handles weekly cuts cleanly, and the price sits well under premium 56V or 80V competitors. Larger lots and tall first-of-season grass will expose the smaller deck and shorter runtime.
Frequently asked questions
Is the Ryobi 40V mower worth $379 in 2026?+
Yes for a quarter acre lot, especially if you already own Ryobi 40V tools. The shared battery platform is the strongest argument because adding a string trimmer or blower later costs only the bare tool, not a new battery setup.
How long does the 40V 6 Ah battery actually last?+
We measured about 45 minutes of cut time across our reference quarter acre lot in dry conditions. Tall first-of-season grass dropped that to about 32 minutes which is consistent with the rest of the cordless mower class.
Ryobi 40V vs Greenworks 80V: which should I buy?+
The [Greenworks 80V](/reviews/greenworks-pro-21-mower) cuts a wider 21-inch swath and runs longer at 60 minutes, but it costs $70 more. If you have a half acre or more, the Greenworks is the better fit. If you have a quarter acre and own other Ryobi 40V tools, the Ryobi is the smarter buy.
Will it handle tall first-of-season grass?+
Yes with technique. Raise the cut height to 4 inches, slow the self-propel dial to 50 percent, and stop to clear the bag chute often. Mowing tall wet grass at full speed will bog the motor and short the runtime, the same way every cordless mower behaves.
Riley Cooper
Riley Cooper writes for The Tested Hub.
Related reviews
DeWalt 20V MAX 21-Inch Cordless Mower Review (2026): Two Battery Mower for the DeWalt Tool Owner
EGO Power Plus LM2135SP 21-Inch Self-Propelled Mower Review (2026): A Quieter, Smarter EGO
