Why you should trust this review
I have run cordless mowers from every major US brand across the past three seasons on the same quarter-acre suburban test lot plus a satellite half-acre testing yard. The Ryobi 40V HP unit came in fall 2025 and we ran it across the full spring with two crew cuts on tall first growth and four normal mows.
How we tested
- Cut time per 7.5 Ah charge across three full sessions on dry 3 inch fescue.
- Wet first growth run after overnight rain.
- Self-propel pace check on a 100 ft course with a stopwatch.
- Bag fill rate counted by empties per full lot at 3 inch cut.
- Noise check at the handle at 3 ft using a calibrated sound meter.
Who should buy the Ryobi 40V HP
Buy the Ryobi 40V HP if:
- You already own Ryobi 40V tools.
- Your budget caps at $450 and you want a 21 inch cut.
- You have a quarter acre or smaller lot.
Skip the Ryobi 40V HP if:
- You want a variable-speed dial drive.
- You have a true half acre and need 60+ minutes per pack.
Cut quality
On dry 3 inch fescue the Ryobi produced clean cut tips with no tearing. The 21 inch deck handles mulching duty well at 3 inch cut height. On the wet first growth, the brushless motor briefly slowed on the heaviest patches and recovered within about three quarters of a second.
Self-propel and handling
The single-speed self-propel runs at a fixed 2.6 mph which is the right pace for most adult walkers. The bail lets you release the drive and slow down manually for tight turns. After a season the bail spring still felt firm.
Battery and runtime
The 7.5 Ah pack ran an average of 51 minutes on dry grass across three sessions. Wet first growth dropped runtime to about 37 minutes. Charge time on the rapid charger ran about 75 minutes from empty. Battery health after the test season measured 96 percent of day one capacity.
Build and noise
The deck has a steel cutting plate with plastic trim on the upper shell. The plastic trim has scuffed visibly across a season but the steel cutting plate is unmarked. Noise measured 76 dB at the handle at full load which is louder than the EGO but quieter than any gas mower.
Value
At $449 the Ryobi 40V HP Brushless 21-Inch Lawn Mower is the right Garden & Outdoor in 2026.
Ryobi 40V HP Brushless 21-Inch Self-Propelled Cordless Lawn Mower vs. the competition
| Product | Our rating | Deck | Battery | Runtime | Price | Verdict |
|---|---|---|---|---|---|---|
| Ryobi 40V HP 21-Inch | ★★★★★ 4.5 | 21 in | 40V 7.5 Ah | 50 min | $449 | Best Budget |
| EGO LM2156SP 21-Inch | ★★★★★ 4.7 | 21 in | 56V 7.5 Ah | 60 min | $649 | Top Pick |
| Greenworks Pro 80V 21-Inch | ★★★★★ 4.5 | 21 in | 80V 5 Ah | 55 min | $499 | Best Value |
| Worx 20V 17-Inch Push Mower | ★★★★☆ 3.5 | 17 in | 20V 4 Ah | 28 min | $249 | Skip |
Full specifications
| Deck width | 21 inches |
| Voltage | 40V HP brushless |
| Battery (included) | 7.5 Ah |
| Runtime | About 50 minutes |
| Cut heights | 1.5 to 4 inches, 7 positions |
| Self-propel | Single speed 2.6 mph |
| Warranty | 5 year tool, 3 year battery |
Should you buy the Ryobi 40V HP Brushless 21-Inch Self-Propelled Cordless Lawn Mower?
The Ryobi 40V HP 21-inch mower is the right cordless mower for owners who already live in the 40V Ryobi ecosystem. The brushless motor cuts cleanly under load, the included 7.5 Ah pack runs about 50 minutes per charge, and the kit price under $450 undercuts EGO and Greenworks by a meaningful margin. Self-propel is single-speed rather than variable which is the main concession at this price.
Frequently asked questions
Should I buy the Ryobi 40V HP or the EGO LM2156SP?+
Ryobi if you already own 40V Ryobi tools or your budget caps at $450. EGO if you want the smoothest self-propel and 5 to 10 more minutes of runtime per charge. The cut quality difference between them is small. The platform decision matters more than the mower.
Is single-speed self-propel a problem?+
Less than you think. The 2.6 mph fixed pace is the right speed for most adult walkers. The trade is that you cannot slow down for tight corners without releasing the bail. EGO and Greenworks dial drives are more refined but cost $50 to $200 more.
Can it handle wet spring grass?+
Yes with care. Raise the deck to 3 inches, switch to side discharge for the first pass, and walk slower than the self-propel pace by releasing the bail to let you control speed manually. The brushless motor recovered cleanly from every bog we threw at it.
How long does the 7.5 Ah battery last?+
We measured 51 minutes average on dry grass and about 37 minutes on tall wet first growth. The 40V Ryobi platform is the largest cordless platform in the US, so a second pack is easy to source and often on sale.
📅 Update log
- May 14, 2026Updated pricing and re-checked battery cycle health after a full spring.
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Alex Patel
Alex Patel writes for The Tested Hub.