Ryobi 40V Lawn Mower: Complete Guide

The Ryobi 40V lawn mower has become a go-to for homeowners cutting the gas cord, and for good reason: it starts with a button, needs no oil or spark plugs, and runs quiet enough to mow early without waking the neighborhood. Sold widely at The Home Depot, the 40V line spans compact 16-inch push mowers up to 21-inch self-propelled models that hold their own against gas. Here’s what to know before you buy.

The Ryobi 40V Lineup

Ryobi builds several tiers on the same 40V battery platform, so your packs carry across mowers, trimmers, blowers, and chainsaws.

• 16-inch push mowers — the lightest, cheapest option around $250 to $300 with a battery; ideal for small, flat yards.
• 20-inch push and self-propelled — the mainstream choice, $350 to $450, with more cutting width and runtime.
• 21-inch self-propelled and brushless — the top homeowner models, $450 to $600, with steel decks, LED headlights, and cruise control for larger lawns.
• HP brushless series — Ryobi’s most efficient motors, squeezing more runtime and torque from the same batteries.

Runtime: How Much Can You Cut?

Runtime depends on battery amp-hours, grass thickness, and deck size. A single 6.0Ah 40V battery typically mows about a third to a half acre on a charge; a 7.5Ah or two-battery setup extends that toward three-quarters of an acre. Many kits ship with two batteries and a dual-port charger, or an onboard two-bay design that runs one pack while the other waits. If your lawn approaches an acre, plan on a spare 6.0Ah pack (around $150) so you never stall mid-cut.

Self-Propelled vs. Push

Push models are lighter and cheaper but you supply all the forward force, which tires you on slopes or long runs. Self-propelled versions add a rear-wheel or front-wheel drive with a variable-speed dial, so the mower pulls itself and you just steer. For any yard with hills or over a quarter-acre, the self-propelled premium of $75 to $100 is worth it. The brushless self-propelled 21-inch model is the sweet spot for most suburban lots.

Cut Quality and Features

Ryobi’s 40V mowers offer 3-in-1 capability: bag, mulch, or side-discharge. Cutting height adjusts with a single lever across roughly 1.5 to 4 inches. Higher-end models add LED headlights for dusk mowing, a load-sensing motor that ramps power in thick grass, and a folding handle that stores upright to save garage space. The brushless motors deliver torque comparable to a small gas engine and hold blade speed better under load than the older brushed units.

Safety and Battery Handling

Cordless doesn’t mean risk-free. The blade spins at high speed, so remove the battery pack before you tip the mower, clear the deck, or change the blade — this is the cordless equivalent of pulling a spark plug wire and it prevents the worst injuries. Wear closed shoes and eye protection, and clear the lawn of sticks and stones before mowing. Store batteries indoors at moderate temperature; extreme heat and deep cold both shorten pack life. Never charge a wet battery.

Maintenance Made Simple

The best part of going cordless is what disappears from your chore list: no oil changes, no gas, no stale-fuel carburetor problems, no pull cord, no spark plugs. Maintenance shrinks to keeping the blade sharp, rinsing grass off the underside of the deck (battery removed), and storing the packs properly. Sharpen or replace the blade once or twice a season; a dull blade tears grass and drains the battery faster. That’s essentially the whole routine.

Ryobi 40V vs. Gas Mowers

A gas mower still wins on raw endurance — you can refuel in 30 seconds and mow all day. But for the typical suburban lawn under an acre, the Ryobi 40V lawn mower matches gas on cut quality while eliminating the maintenance, noise, fumes, and fuel cost. It starts instantly in any weather, runs at roughly half the noise, and produces no emissions at the point of use. The one real limit is battery capacity, solved with a spare pack.

Ryobi 40V vs. Ryobi 18V and 80V

Ryobi also sells 18V ONE+ mowers (lighter-duty, smaller yards) and a newer 80V line (garden-tractor and large-lot power). The 40V platform sits in the middle and shares batteries with Ryobi’s huge 40V tool range, making it the most versatile for a homeowner who also wants a cordless trimmer, blower, and hedge trimmer on the same packs. That cross-tool compatibility is a major reason people stay in the 40V ecosystem.

Brushless vs. Brushed Motors

Ryobi sells both, and the difference matters. Brushed motors are cheaper but less efficient — they waste energy as friction and heat, giving shorter runtime and less torque in thick grass. Brushless (marked “HP” on Ryobi’s line) motors run cooler, last longer, and squeeze more mowing out of the same battery while holding blade speed under load. If your budget allows, the brushless models are worth the extra $50 to $100, especially for larger or thicker lawns. For a small, thin lawn mowed weekly, a brushed model is perfectly adequate and saves money.

Battery Care for Maximum Life

Lithium-ion packs are the most expensive part of the system, so treat them well. Avoid draining a battery completely dead repeatedly; recharge when the mower slows rather than running it to a hard stop. Store packs indoors between about 50 and 80°F — a hot garage in summer or a freezing shed in winter both shorten cell life. For long off-season storage, leave the battery at roughly half charge rather than full or empty, and top it up every couple of months. Never charge a wet or visibly damaged pack, and keep the terminals clean and dry.

Mowing Tips for Better Results and Runtime

• Mow dry grass — wet clippings clump, clog the deck, and drain the battery far faster.
• Keep the blade sharp — a dull blade tears grass and forces the motor to work harder, cutting both quality and runtime.
• Follow the one-third rule — never remove more than a third of the blade height at once; tall grass bogs the motor.
• Mulch when you can — mulching returns nutrients to the lawn and uses less power than filling and emptying a bag.
• Use eco or low mode — many models offer a power-saving mode that stretches runtime on lighter grass.

Warranty and Support

Ryobi backs its 40V mowers with a 5-year tool warranty and a 3-year battery warranty, which is generous for the price bracket and among the reasons the platform sells so well. Register your purchase and keep the receipt, since warranty claims require proof of purchase and the date. The Home Depot’s wide availability also means parts, replacement batteries, and accessories are easy to find on short notice — a real advantage over online-only cordless brands when you need a blade or a spare pack the same day. Replacement blades run about $15 to $25 and swap out in minutes.

Storing Your Mower for Winter

Off-season storage is simple with a cordless mower and protects your investment. Rinse grass off the deck underside with the battery removed and let it dry fully to prevent rust. Remove the batteries and store them indoors at moderate temperature, charged to about half capacity rather than full or empty, and top them off every couple of months. Fold the handle to save space and stand the mower upright if the design allows. Come spring, a quick blade sharpen and a fresh charge have you cutting again with none of the stale-fuel headaches that plague gas mowers.

Is the Ryobi 40V Lawn Mower Worth It?

For most homeowners with a lawn under three-quarters of an acre, yes. You get gas-comparable cutting, near-zero maintenance, quiet operation, and batteries that power an entire yard-care toolkit. Match the deck size and battery capacity to your lawn: a 16-inch push model for small flat yards, a 21-inch brushless self-propelled with two 6.0Ah packs for anything larger or hilly. Buy the kit with two batteries when you can — it costs less than buying a spare later and guarantees you finish every mow. A well-chosen Ryobi 40V lawn mower is the easiest way to leave gas behind without sacrificing performance.