EGO Robot Mower Review: What It Actually Is

The title “EGO robot mower” gets searched often enough, and I want to address that upfront: EGO does not currently make a fully autonomous robot mower. What they make is the EGO POWER+ LM2135SP 21” Self-Propelled Cordless Lawn Mower, which is a self-propelled walk-behind mower with enough technology packed into it that people apparently confuse the two. If you landed here looking for a sit-back-and-watch autonomous unit, you’ll want to read our robot lawn mower garage piece instead. If you’re here because you want a battery-powered mower that does most of the physical work for you, you’re in the right place.

I’ve been running the LM2135SP for two full mowing seasons on roughly two acres of active lawn on my 12-acre property. My previous mower was a Husqvarna HU700F with the Honda GCV 160 engine. The EGO replaced it. That’s the context.

If you want to explore the broader world of cordless outdoor power before committing, our Battery & Cordless Tools hub is a reasonable starting point.

Quick Verdict

The LM2135SP is the best battery-powered walk-behind mower I’ve used, and I’d buy it again. The runtime is real, the self-propel system works properly, and the cut quality on the Select Cut multi-blade deck is genuinely close to what I was getting from a well-tuned gas mower. The caveats are real too: it’s heavy, the tool-only version requires a separate battery and charger purchase that will surprise you at checkout, and 68 lbs is a number that matters on anything other than flat ground.

Recommended. Not for everyone, but for the right yard, it’s the right mower.

Key Specs

The LM2135SP runs on EGO’s 56V ARC Lithium platform. The 7.5Ah battery that comes with the kit version gives up to 60 minutes of runtime per charge under reasonable conditions. The 21-inch steel deck handles mulching, bagging, and side discharge. Cutting height adjusts from 1.5 to 4 inches across 6 positions, controlled by a single lever. The Touch Drive self-propel system is variable speed, responding to how hard you press the handle rather than a fixed dial. Weight with battery installed is around 68 lbs.

The kit version (mower, battery, and rapid charger) currently runs around $649 on Amazon. The tool-only version is around $449. The 7.5Ah battery alone is approximately $199 if purchased separately, and the rapid charger adds another $80 or so at the time of writing. Do that math before you buy the tool-only version thinking you’re saving money.

The 56V platform is cross-compatible with the full EGO lineup. If you already own EGO batteries from a string trimmer or, say, an EGO pole hedge trimmer, that changes the value calculation significantly.

Performance & Testing

Runtime

On my lawn, which runs a mix of bluegrass and fine fescue with some low spots that stay wet longer than I’d like, I consistently got 45 to 52 minutes per charge in standard mulching mode at mid-height. Running the bag and cutting slightly longer grass dropped me to around 38 to 42 minutes. EGO’s 60-minute claim is achievable, but it’s the ceiling, not the average. (I timed this over six sessions with a stopwatch, because the marketing numbers on battery runtime are almost universally optimistic.)

For context, my active lawn is roughly two acres, and I typically cover it in two charges. The rapid charger brings the 7.5Ah battery from empty to full in about 75 minutes, so the break between charges is manageable rather than a half-day interruption.

Cut Quality

The Select Cut multi-blade system is the feature that separates this mower from most of the cordless competition. The deck runs three smaller blades rather than one large blade, which keeps tip speed high enough to produce a clean cut even as battery charge drops. With a single-blade cordless mower, you often notice the cut quality degrading as the battery depletes. I didn’t experience that problem with the LM2135SP. The mulch output is fine and distributes evenly. Bagging is efficient. Side discharge works as expected.

Comparing directly to the Husqvarna HU700F I replaced: cut quality is comparable on dry grass. On wet or heavy grass, the gas mower had more consistent torque. The EGO slows noticeably when you push it into a thick patch. It doesn’t stall, but you feel the resistance in a way you don’t with a gas engine.

Self-Propel System

Touch Drive is the one feature I would have been skeptical about if I hadn’t used it. The speed responds to bar pressure rather than a thumb dial or speed selector, which means it adjusts naturally as you slow down around obstacles or speed up on straightaways. After one session it felt intuitive. After a full season it felt like something I actively missed when using any other mower. If you’ve ever fought a self-propelled mower that wanted to walk faster than you did, or one that demanded you fiddle with a lever every time you changed pace, this is what that problem looks like solved.

Weight and Handling

68 lbs is the honest number. On flat ground it’s manageable because the self-propel system carries most of it. On a slope, that weight becomes the primary issue. My property has a few grades in the 15 to 20 degree range, and I do not use the LM2135SP on those sections. I have a lighter battery mower for the slopes. If your entire lawn is flat or gently rolling, weight won’t concern you. If you have real grades, account for it.

The turning radius is reasonable for a 21-inch deck. Maneuvering around established beds isn’t difficult, though it’s not as nimble as a 19-inch mower.

Noise and Maintenance

Quiet enough that I mow at 7am without any complaints from neighbors who are closer than I’d prefer. Decibel ratings are marketing, but subjectively it’s roughly half the noise of the Honda-engined Husqvarna. No gas storage, no oil changes, no carburetor gumming up over winter if you forget to run the tank dry. Blade removal and sharpening is the same procedure as any walk-behind. The deck washes out easily through the side port. Those are not small things over a decade of mowings.

Pros and Cons

Pros:

• Genuine 45 to 55-minute runtime under normal conditions
• Touch Drive self-propel actually works the way variable speed should
• Select Cut multi-blade deck maintains cut quality as battery depletes
• 56V platform shares batteries across the EGO lineup
• No gas, no oil, no winter storage prep beyond pulling the battery
• Quieter than any gas mower in this class

Cons:

• Tool-only version pricing is misleading if you don’t already own the 56V battery and charger
• 68 lbs with battery installed is a real limitation on slopes
• Performance in heavy or wet grass is noticeably behind an equivalent gas mower
• Bag capacity is adequate but not generous at around 1.9 bushels
• Deck height adjustment lever requires noticeable force to move

Who It’s For

The LM2135SP makes the most sense if your mowing area is under two acres, your terrain is mostly flat to gently rolling, and you either already own EGO 56V batteries or you’re buying the kit version where the battery is included in the price. The case strengthens considerably if you want to consolidate your outdoor equipment onto one battery platform. Pairing this mower with a cordless blower (our review of the 40V cordless leaf blower covers a good lower-cost complement if you don’t need the full 56V blower) and a trimmer means one charger and one battery family across the whole yard.

It’s also a reasonable choice if you’ve reached the point where gas equipment maintenance has become more of a chore than the mowing itself, which I’d call a reasonable place to be after enough seasons.

It’s not the right choice if you have significant slopes, if your lawn consistently runs long and wet before you can mow it, or if you’re cutting more than two acres and don’t want to deal with battery swaps.

The competition worth naming: the Greenworks Commercial 82V 25-inch self-propelled mower is a serious alternative at around $599 for the tool-only version and handles a larger cut width. The Ryobi 40V 21-inch self-propelled (around $449 with battery) is the budget comparison point, and it’s a reasonable mower, but the Touch Drive system and Select Cut deck are noticeable steps up. For anyone who has been running a Husqvarna HU800AWD or similar premium gas mower and finds the switch to battery daunting, the EGO is the closest experience to gas I’ve found in a cordless walk-behind.

If you’re building out a full cordless tool kit, it’s worth spending some time on our Battery & Cordless Tools hub before you buy, particularly to think through battery compatibility across brands before you commit to a platform.

For trimming and edging to pair with this mower, the Stihl battery edger and the EGO hedge trimmer attachment are both worth reading alongside this review, since yard equipment tends to get bought in clusters rather than in isolation.

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Frequently Asked Questions

Does the EGO LM2135SP come with a battery and charger?

It depends on which version you buy. The kit version includes the 7.5Ah 56V battery and rapid charger and runs around $649 currently. The tool-only version is around $449 but does not include either. If you don’t already own a compatible EGO 56V battery, the tool-only version is not actually cheaper once you add the battery (around $199) and charger (around $80) separately.

How long does the battery last on a single charge?

Under normal mowing conditions in mulch mode on dry grass, expect 45 to 55 minutes realistically. EGO’s 60-minute claim is possible but represents close to ideal conditions. Running the bag, cutting heavy grass, or using maximum self-propel speed will reduce that closer to 38 to 42 minutes. The rapid charger returns the 7.5Ah battery to full in approximately 75 minutes.

Can the EGO LM2135SP handle hills and slopes?

On gentle grades it performs well, with the self-propel system doing most of the work. On steeper slopes, the 68-lb weight with battery becomes a handling issue. I would not use this mower on anything over roughly 15 degrees of incline. If your property has significant grading, this is a real constraint to weigh before buying.

Is the EGO 56V battery compatible with other EGO tools?

Yes. The 56V ARC Lithium platform is cross-compatible across the EGO Power+ lineup, including string trimmers, blowers, hedge trimmers, chainsaws, and snow blowers. If you already own EGO 56V batteries from other tools, they work in the LM2135SP. This is one of the stronger arguments for buying into the EGO platform rather than mixing brands.

How does the EGO LM2135SP compare to a gas mower?

On flat, dry grass it’s comparable in cut quality to a mid-range gas push mower. In heavy or wet conditions, gas has a torque advantage that’s noticeable. The practical differences favor the EGO for most homeowners: no fuel storage, no oil changes, significantly quieter operation, and lower annual maintenance cost. If you’re replacing a premium gas mower like a Husqvarna HU800AWD, expect the EGO to handle 90 percent of your mowing situations equally well, with a few conditions where gas would have done better.