Greenworks 40V 19in Push Lawn Mower: How to Use It Like a Pro
A hands-on look at the Greenworks 40V 19in push lawn mower: safety key, mulch vs bag, single-lever height, and what 30 minutes of battery really covers.
Reviewed by
Scott Ayres
Welcome to the Product Demo lab where I (Scott) demo products so you can make an educated buying decision. I keep it real, honest and laid back.
This post contains affiliate links. I may earn a commission at no extra cost to you.
My grass had gotten extremely tall because our other mower had broken. That’s the situation the Greenworks 40V 19in Push Lawn Mower walked into, and it’s the reason this isn’t a showroom demo on a perfect lawn. There was real, overgrown grass to get through, some of it way taller than you’d ever let it get on purpose.
Quick Verdict
My old mower broke and the grass got extremely tall, so this was a real test. The Greenworks 40V 19in push lawn mower stayed nice and quiet, doesn’t smell, and still mowed great through grass it had no business handling well.
Buy if you:
- Want a push lawn mower with no gas, no oil, no smell
- Have a small to mid yard you can cover in about 30 minutes
- Want kids kept out with a removable safety key
- Already own or plan to add Greenworks 40V tools
Skip if you:
- Regularly mow tall or wet grass, the mulch chute packs with clippings and needs cleaning
- Have a large lot, one 4.0Ah battery runs up to 30 minutes
- Want a self-propelled drive, this one is a straight push
| Deck | 19 in steel |
|---|---|
| Battery | 40V 4.0 Ah + charger |
| Run time | Up to 30 min per charge |
| Height positions | 7, single lever |
| Discharge | 2-in-1 mulch or side discharge |
| Warranty | 3-year limited (tool + battery) |
Push Lawn Mower Dead? One Charge Fixes It
So this is less “here’s a spec sheet” and more me showing you the couple of features I really love on this push lawn mower, plus the one thing you’ll want to keep an eye on. If you’re cross-shopping cordless mowers, that mix of what’s easy and what’s fiddly is the part worth your time.
How the Battery, Key, and Start Actually Work
The battery only goes in one way, so you can’t put it in wrong. You pop the lid up, slide the 40V 4.0Ah pack in, and it kind of pops into place. Make sure it pops into place, that click matters. It’s the kind of thing that removes a whole category of “why won’t it start” headaches before you ever hit the button.
Then there’s a safety key you have to have in to use it. That part I really like. If you don’t want the kids starting it, you pull the key out and hide it, and they can’t run the mower at all. Simple, and smarter than it sounds for anybody with curious little ones around.
To start it, you push the button and pull the handle back at the same time. Doing that while holding a cell phone to film was a little bit of a challenge, but it fired right up. Letting go stops it, which was nice and easy to do. That’s your dead-man safety, and it’s exactly how you want it behaving.
It’s Quiet, But It Really Mows Great
Runs quiet enough to hold a conversation, and it didn’t bog down once through grass that was embarrassingly overgrown. No gas smell, no engine roar, just a brushless motor grinding through the kind of neglected growth I’d have expected to stall a cheaper cordless mower. It didn’t stall.
You can see I’d already been mowing before I even started showing features, and it had done a good job. There was still some really tall grass to get over on the far side, the kind of overgrowth that bogs down cheaper mowers. This one kept chewing through it. The 19-inch steel deck covers a decent swath per pass, so you’re not making a hundred trips across a normal yard.
The quiet part is easy to undersell until you’ve used it. No ear protection, no waking the neighborhood at 8am, no lingering exhaust smell on your clothes. If the only electric mowers you’ve tried were weak and whiny, this doesn’t feel like that.
The Mulch Chute Packs With Wet Grass
The mulcher attachment got stuck with grass mid-demo. When I went to pull it out to show you, it was jammed up with clippings and wouldn’t come free clean. That’s the friction here, and it’s worse the wetter and taller your grass is.
So take it as a good reminder to clean that out after you’re done mowing, especially when you’ve been mowing wet grass. It’s not a defect, it’s just how mulching works when the deck’s dealing with heavy, damp clippings. If your lawn is bone dry and kept short, you’ll probably never notice. Mine wasn’t, so I did.
If you want the bag instead of mulching, you take the mulch plug out and put the bag on, and it just kind of pops back in. The 2-in-1 setup means you can also side discharge. Knowing which mode fits your grass conditions saves you the jammed-chute surprise I hit.
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Greenworks 40V 19in Push Lawn Mower
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Adjusting the Cut Height Is Dead Simple
One lever, seven positions, and it clicks into place as you slide it, pull all the way up for high, push all the way down for a tight cut. That’s the whole operation, no crouching at each wheel, no getting three corners right and forgetting the fourth.
No separate wheel levers to fight, no getting three corners right and forgetting the fourth. That matters more than it sounds because a mower that’s a pain to adjust is a mower you leave at one height forever. This one you’ll actually change based on the season.
Who This Push Lawn Mower Fits Best
The 4.0Ah battery gives you up to 30 minutes, enough for a typical suburban lot, not an acre. If your property pushes past that, you’re stopping mid-mow to recharge unless you keep a second battery on the charger.
It’s a strong fit for anyone tired of gas: no oil changes, no fumes, no pull-start ritual. The removable safety key makes it a good pick for households with kids around, since you can lock it out completely. And if you already own Greenworks 40V tools, the batteries cross over to 75+ of them, which stretches the value well past just this mower.
The one crowd I’d steer elsewhere: anyone regularly mowing thick, wet, or badly overgrown grass. It’ll do it, mine proved that, but you’ll be cleaning that mulch chute and babysitting the run time more than you’d like.
Cordless vs a Gas Push Mower
Gas wins on endurance, this wins on everything around it. A gas push mower doesn’t cap you at 30 minutes and doesn’t care if you’ve got a huge lot. That’s the trade. If you mow big and mow long, gas still has a runway advantage no single battery closes.
But for a normal yard, the Greenworks flips almost every other column. No gas to buy, no oil to change, no emissions, no smell, and it starts with a button instead of yanking a cord until your shoulder complains. It’s quiet enough to mow early without annoying anyone. For most suburban lawns, that convenience beats the extra runtime you’d rarely use anyway.
Tips Before Your First Mow
Charge the battery fully before you start, and if your grass is tall like mine was, plan your route so you’re not caught mid-yard when the 30 minutes runs low. Overgrown grass eats battery faster than a tidy weekly cut.
Confirm the battery pops into place every time, because a not-quite-seated pack is the number one reason these won’t fire. Keep the safety key somewhere you’ll remember but the kids won’t find. And clean the mulch chute out after every mow, especially if the grass was damp, so you’re not fighting a packed-up deck next time. That one habit fixes the biggest annoyance I ran into.
Pros
- Nice and quiet, and it really mows great even through tall grass
- No gas, no oil, no smell, push-button start
- Battery only fits one way and pops into place, hard to load wrong
- Removable safety key locks kids out completely
- Single-lever 7-position height adjustment is dead simple
- 2-in-1 mulch or bag, and the plug pops back in easily
Cons
- Mulch chute jams with grass, especially wet clippings, needs cleaning after each mow
- Up to 30 minutes of run time limits you to smaller yards on one battery
- Push button plus handle pull at the same time is awkward one-handed
- Straight push, no self-propelled drive
What we’d improve
A couple of things the next version could tidy up:
- The mulch chute clogs too easily, a wider or smoother clipping path would keep wet grass from packing in and jamming the plug when you go to remove it.
- Single-battery run time, bundling or making room for a second 4.0Ah pack would let owners with tall or larger lawns finish without stopping to recharge.
Frequently Asked Questions
How long does the battery last per charge?
Up to 30 minutes on a fully charged 4.0Ah battery. That number drops with tall, thick, or wet grass and climbs a bit with a light weekly trim, so treat it as a ceiling rather than a promise.
Does the battery and charger come with it?
Yes, this listing includes the 40V 4.0Ah battery and the charger. You don’t need to buy a separate power kit to get started, it’s ready to charge and mow out of the box.
Can I use it with other Greenworks tools?
Yes, the 40V battery works across 75+ Greenworks 40V tools like trimmers, blowers, and chainsaws. If you’re building a cordless yard kit, one battery platform covers all of them.
How do I keep kids from starting it?
Pull out the safety key and hide it. Without that key inserted, the mower won’t run at all, so it’s a simple way to lock out curious kids when it’s parked in the garage.
Does it mulch and bag, or just one?
Both, plus side discharge. It’s a 2-in-1 design, so you leave the mulch plug in to mulch or pull it out and attach the bag. The plug pops back in easily when you switch modes.
How do I clean the deck after mowing?
Pull the mulch attachment and clear the packed grass out, especially after cutting wet grass. Doing it right after each mow keeps the chute from jamming next time, which is the main maintenance headache I ran into.
Is there a warranty?
Yes, a 3-year limited warranty covers both the tool and the battery. That’s a decent window for a cordless mower, and it includes the battery, which is usually the first thing people worry about long term.
Is it self-propelled?
No, it’s a straight push mower, so you provide the forward motion. On a flat yard that’s no problem, but if you’ve got steep slopes or you want the mower to pull itself, this isn’t that model.
Will it handle overgrown grass?
Yes, mine cut through extremely tall grass after our old mower broke and left it neglected. Expect the chute to clog faster and the battery to drain quicker in that condition, so take it slower and clean the deck afterward.
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Greenworks 40V 19in Push Lawn Mower
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About the reviewer
Scott Ayres
Welcome to the Product Demo lab where I (Scott) demo products so you can make an educated buying decision. I keep it real, honest and laid back.
