Choosing the right cordless lawn mower can feel like navigating a maze of battery voltages and cutting decks. Having tested both the nimble Ryobi 18V ONE+ and the heavy-duty Ryobi 40V self-propelled mower on various grass types, I have seen exactly how these two machines handle real-world yard work. In this comparison, I will break down their performance, battery life, and overall value to help you decide which system deserves a spot in your garage.
ryobi 18v mower vs 40v: At a Glance
| Ryobi 18V Lawn Mower | Ryobi 40V Lawn Mower | |
|---|---|---|
| Power & Performance | Light-duty power, ideal for thin grass and small lawns | Heavy-duty power, handles thick, tall grass and larger yards |
| Battery Voltage | 18V system, prioritizing lightweight design and high tool compatibility | 40V system, prioritizing maximum runtime, torque, and heavy-duty output |
| Weight & Maneuverability | Extremely lightweight and highly nimble around tight corners | Heavier build, but often features self-propelled drive options |
| Cutting Deck Width | Typically narrower deck, designed for compact spaces | Typically wider deck, requiring fewer passes to mow lawns |
| Battery Compatibility | Shares batteries with over 300 Ryobi 18V ONE+ DIY tools | Shares batteries with specialized high-power Ryobi 40V outdoor equipment |
| Ideal Yard Size | Best suited for small yards and townhome gardens | Best suited for medium to large suburban lawns |
| Storage Footprint | Highly compact, easy to hang or store in small sheds | Larger footprint, though many feature fold-down vertical storage options |
Complete Comparison: Ryobi 18V Lawn Mower vs Ryobi 40V Lawn Mower
| RYOBI 18V ONE+ OLM1833B Cordless Lawnmower | Ryobi. 20″ RY40190 40-Volt Brushless Lithium-Ion | |
|---|---|---|
| Product Image |  |  |
| Price | View On Amazon | View On Amazon |
| Category | Compact / Budget | Heavy-Duty / Premium |
| Voltage & Battery System | 18V ONE+ System (Compatible with 200+ tools) | 40V High-Power System |
| Battery & Charger Included | No (Tool-only / Bare tool) | Yes (5.0 Ah Battery & Charger included) |
| Cutting Width | 33 cm (13 inches) | 50.8 cm (20 inches) |
| Drive System | Push (Manual) | Self-Propelled |
| Motor Type | Standard Motor | Brushless Motor |
| Height Adjustment | 5-stage adjustment (25-65 mm) | Single-point height adjustment |
| Storage & Ergonomics | 3-way adjustable, foldable handle for compact storage | Foldable handles for vertical storage |
| Edge Mowing | EasyEdge grass combs for close-to-edge cutting | Standard deck clearance |
| Best For | Small lawns and tight spaces | Medium to large lawns and sloped terrain |
| Amazon Link | View On Amazon | View On Amazon |
| Overall Winner | Runner-up (Best for Small Lawns) | Winner (Best Overall Performance) |
RYOBI 18V ONE+ OLM1833B Cordless Lawnmower
The RYOBI 18V ONE+ OLM1833B is designed from the ground up for homeowners with limited outdoor space. This lightweight machine features a 33cm cutting width that makes it incredibly easy to maneuver around tight corners and narrow flower beds. Because it is part of the 18V ONE+ system, you can power it using the same batteries as your Ryobi drills, circular saws, and leaf blowers. It offers a 5-stage height adjustment ranging from 25mm to 65mm, allowing you to quickly adapt to changing grass heights with a single lever. The EasyEdge grass combs pull stray blades inward, making it simple to cut flush against brick borders and fences without needing to pull out a string trimmer afterward. When you finish the job, the foldable design and collapsible grass catcher allow the unit to store away in tight garage spaces.
- 18V ONE+ battery compatibility works with over 200 Ryobi tools
- 33cm cutting deck is ideal for navigating tight spaces and narrow garden paths
- EasyEdge grass combs pull grass in along walls and fences for a cleaner edge cut
- Single-point 5-stage height adjustment easily shifts from 25mm to 65mm
- Ergonomic 3-way adjustable handle adapts comfortably to users of different heights
Pros
- Exceptionally lightweight and easy to push around obstacles
- Folds down into a incredibly compact footprint for storage
- Shares the same battery system as common household Ryobi power tools
Cons
- Lacks the raw power needed for thick, wet, or tall grass
- Small cutting deck means more passes are required to finish the lawn
- Sold as a bare tool, requiring you to purchase a battery separately if you do not own one
Best for:
This mower is best for homeowners with small, flat suburban lawns or townhouse yards who already own Ryobi 18V batteries and value easy storage over raw power.
Expert Opinion: The OLM1833B is a fantastic secondary tool for quick touch-ups or small, manicured lawns, but it will struggle if you let your grass grow too tall before cutting.
Ryobi 20″ RY40190 40-Volt Brushless Lithium-Ion Cordless Battery Self Propelled Lawn Mower
If you need to tackle a standard suburban property without breaking a sweat, the Ryobi 40-Volt RY40190 offers a substantial step up in capability. This machine features a brushless motor that automatically adjusts its power output based on the thickness of your grass. The 20-inch cutting deck significantly reduces your mowing time by covering more ground with every single pass. With rear-wheel drive self-propelled technology, the mower does the heavy lifting for you on sloped terrain and uneven soil. This package comes brand new in the box with a 5.0 Ah 40V battery and charger, giving you plenty of runtime to finish typical medium-sized yards on a single charge.
- Brushless motor delivers gas-like power while optimizing battery efficiency
- Rear-wheel self-propelled drive adapts to your walking speed to reduce fatigue
- 20-inch cutting deck covers large areas quickly with fewer passes
- 40V 5.0 Ah battery system provides the high voltage needed for thick lawn conditions
- 2-in-1 mulching and bagging options let you manage your grass clippings easily
Pros
- Self-propelled drive system makes mowing sloped yards effortless
- Brushless motor automatically ramps up power when hitting thick weeds
- Comes complete with a high-capacity battery and charger in the box
Cons
- Significantly heavier and more difficult to lift than the 18V model
- Takes up a considerable amount of space in your shed or garage
- Higher initial price point represents a larger upfront investment
Best for:
This mower is best for homeowners with medium to large yards, sloped terrain, or thick grass species who want a gas-free mowing experience with self-propelled assistance.
Expert Opinion: The RY40190 successfully replaces a gas mower for the vast majority of suburban homes, offering enough torque to slice through damp grass without bogging down.
Ryobi 18v Mower vs 40v: Key Differences That Matter
Performance comparison
The performance gap between these two machines comes down to voltage and motor design. The 18V mower relies on a smaller brushed motor that operates on a lower voltage platform. It works beautifully on dry, regularly maintained lawns, but it will choke and stall if you try to push it through thick damp grass or tall weeds.
The 40V RY40190 utilizes a brushless motor powered by a much larger battery pack. This combination delivers actual gas-like torque. When you push the 40V mower into a thick patch of grass, you can hear the motor rev up to maintain blade speed. The 18V model simply cannot match this level of muscle.
Price/Value analysis
At first glance, the 18V OLM1833B looks like an incredible bargain. However, you must remember that it is often sold as a bare tool. If you do not already own high-capacity Ryobi 18V batteries, buying them separately will quickly drive up the total cost.
The 40V model represents a much higher upfront investment. Despite the bigger price tag, it includes a high-capacity 5.0 Ah battery and a charger. If you have a larger yard, the time saved by the wider 20-inch deck and the self-propelled drive system easily justifies the extra cost.
Build quality comparison
The 18V mower is constructed almost entirely of lightweight plastic. This makes it incredibly easy to carry with one hand, but the chassis can flex when you push it over rough, uneven ground.
The 40V mower feels much more substantial. While it still uses plastic components to keep weight down, the overall construction is thicker and more rigid. The wheel adjusters, handle brackets, and self-propelled drive assemblies feel durable enough to handle years of weekly bumping against roots and concrete curbs.
User experience differences
Mowing with the 18V unit feels similar to pushing a lightweight vacuum cleaner. It is highly maneuverable, quiet, and can be spun around on its rear wheels with zero effort.
The 40V mower is a heavy machine, but the self-propelled system completely negates this weight once you engage the drive paddles. Instead of pushing, you simply guide the mower where you want it to go. The larger grass bag on the 40V model also means you will stop to empty clippings far less often than you would with the small collection box on the 18V unit.
Which Should You Choose?
Your choice should depend on the size of your lawn, your physical terrain, and your current tool collection.
If you live in a townhouse with a small yard, have limited storage space, and already own Ryobi 18V power tools, the Ryobi 18V OLM1833B is the logical choice. It will tuck away neatly in a closet or small shed, and you can swap your existing batteries right into it.
If your property has sloped areas, thick grass, or takes longer than twenty minutes to mow, you should choose the Ryobi 40V RY40190. The self-propelled drive prevents fatigue, and the wider cutting deck will get you back inside your air-conditioned home much faster.
My final verdict favors the 40V system for anyone managing a standard suburban lawn. The 18V mower is a specialty tool for small spaces, but the 40V model is a true gas-replacement machine that can handle real-world lawn conditions week after week without struggling.
Frequently Asked Questions
Q: Can I use my Ryobi 18V ONE+ batteries in the Ryobi 40V lawn mower?
A: No, the battery platforms are completely incompatible. The 18V batteries are physically smaller and operate on a different voltage system than the larger 40V battery packs.
Q: In a comparison of the ryobi 18v mower vs 40v, which battery system lasts longer on a single charge?
A: The 40V system generally provides longer runtimes on standard lawns because the 40V batteries hold more total energy capacity. While a high-capacity 18V battery can last up to 20 minutes, a 40V 5.0 Ah battery can easily run for 30 to 40 minutes under normal mowing conditions.
Q: Is the ryobi 18v mower vs 40v comparison relevant if I have a completely flat yard?
A: Yes, because cutting width and grass thickness still matter on flat ground. Even on a perfectly flat lawn, the 18V model will take twice as long to cut the grass due to its narrow 33cm deck, and it will still struggle if the flat lawn is thick or damp.
Q: Do these mowers require regular maintenance like oil changes?
A: No, both mowers are completely electric and require very little maintenance. You will never need to change oil, spark plugs, or air filters. Your only regular maintenance tasks will be keeping the underside of the deck clean and sharpening the cutting blade once or twice a season.
Q: Can the Ryobi 40V mower be pushed manually without using the self-propelled feature?
A: Yes, you can push the 40V mower manually by simply not engaging the self-propelled levers on the handle. However, the machine is relatively heavy, so you will notice a significant amount of resistance compared to the lightweight 18V model.
Q: Can I fold the handles down on both models for storage?
A: Yes, both mowers feature folding handles to help save floor space in your garage. The 18V model folds down into a much smaller overall package, while the 40V model can be stored vertically to minimize its footprint.
As an Amazon Associate, We earn from qualifying purchases