Who This Suits
The Ryobi 40V HP Brushless 21 inch self propelled mower is designed for the homeowner who wants a quiet, affordable, battery-powered mower that works with existing Ryobi 40V tools. It earns our “Best Value” pick for its balance of cost, performance, and convenience. It is best suited for small to medium lawns (up to about a third of an acre on a single charge, or up to half an acre with a spare battery) and for those who prioritize a quiet mow that won’t disturb neighbors. It is not recommended for large lawns over half an acre without multiple spare batteries, nor for commercial or rugged use where a steel deck is needed.
Cutting Power
The 40V HP brushless motor is the standout feature. It delivers consistent power to the 21-inch blade, capable of slicing through thick Bermuda and tall grass (up to six inches in independent owner feedback) without bogging down. The motor runs cool even after extended use, indicating efficient energy conversion. The 21-inch deck spreads clippings evenly, reducing clumping, and the blade maintains a clean cut on grass tips, which supports lawn health. The only reported struggle is with thick, wet leaves in fall, where the mower may slow but not stall; lifting the front wheels clears it.
Battery and Runtime
The battery runtime is the primary trade-off. With the included 40V 6Ah battery, real-world mowing time is 35 to 45 minutes with self-propel engaged and blade at full speed. On a half-acre lawn, this is usually sufficient for efficient mowing, but thick or wet grass may require a second pass, leaving about 20 feet unfinished. Charging the battery takes about 90 minutes. Compared to premium models offering 60–70 minutes, this is a step down, but the mower’s compatibility with the Ryobi 40V battery range allows swapping with other Ryobi batteries (e.g., 4Ah from a trimmer or blower) to extend runtime. For first-time Ryobi buyers, an extra 4Ah or 6Ah battery is recommended for practical use on half-acre lawns. On lighter grass (e.g., fescue), runtime can reach 45–50 minutes; on heavy grass, expect around 35 minutes.
Handling and Build
The self-propelled drive uses a variable speed system controlled by a squeeze bar and a dial. The slowest speed suits thick grass; the fastest works on flat, thin lawns. On slopes, the drive provides adequate pulling power, though it is less robust than premium Toro or Honda models. The front wheels are 7 inches, rear wheels 10 inches, aiding roll over bumps and roots. The plastic deck is thick and reinforced, but feels less durable than steel or aluminum; it has not cracked or warped in owner reports, but flex is noticeable when adjusting cutting height. The single-lever cutting height adjustment (all four wheels) is convenient, though the plastic lever raises durability concerns for frequent use. The handle folds for storage, is padded, and features simple controls (safety key, start button, bail bar). The mulching plug works well; side discharge is easy to install. The grass catcher bag is small and fills quickly on thick grass, requiring frequent emptying—a common cordless mower trait.
Who Should Buy It
This mower is ideal for homeowners with existing Ryobi 40V tools (trimmer, blower, chainsaw) who want battery compatibility and cost savings. It suits those with small to medium lawns (up to 1/3 acre on one charge, up to 1/2 acre with a spare battery) and values quiet operation for early-morning mowing. It is not for large lawns (over 1/2 acre) without multiple batteries, or for commercial or rough-terrain use requiring a metal deck.
Our Verdict
The Ryobi 40V HP Brushless 21 inch self propelled mower earns its Best Value pick for its strong cutting performance, quiet operation, and battery compatibility with the Ryobi 40V ecosystem. The brushless motor provides ample power for most grass types, and the self-propel system eases mowing on slopes. While the battery runtime is shorter than premium models and the plastic deck feels less durable than metal, the mower is reliable with no reported mechanical issues (no belt snaps, blade seizures, or battery failures). For the price, it offers a practical balance of cost, performance, and convenience for the average homeowner.
