Best cordless lawn mower 2021: top-rated battery-powered lawnmowers

Replace your tired old push-along with one of the best cordless lawn mowers in town. For you, lawn, the turf war is over

Best cordless lawn mower 2021

Spring is here, the grass is growing and you need the best cordless lawnmower to cut it with. Garden centres and DIY outlets might have stock, but it makes more sense to buy the best lawn mower online, where prices are usually better, and they bring it to your door.

The best cordless lawn mower should be one of the first spring/summer purchases on many a gardener's mind, because cutting the grass is a real pain if you’re heaving around a tired old push-along, or corded electric mower. By contrast, it's really rather fun when you're equipped with one of the best cordless lawn mowers money can buy.

Here, we're talking specifically battery-powered lawnmowers. Throughout the spring and summer your grass gets used more than during the rest of the year so it’s important to look after it, and these types of mowers can help you do so with ease. They're especially good for small to medium sized lawns but that doesn't mean those with larger acreages should turn their noses up.

Remember that this guide deals with the best cordless lawn mowers on the market, but T3 has dedicated guides to every type, so you may be better served in our best petrol lawn mower, best robot lawn mower and best ride on lawn mower articles.

The best cordless lawnmowers you can buy today

Kärcher LMO 18-33 Best cordless lawn mower 2021T3 Award

Got a small lawn? Then the Kärcher LMO 18-33 is a great choice.

(Image credit: Kärcher)

1. Kärcher LMO 18-33

The best cordless mower for small lawns

Power: 18v
Deck size: 33cm
Cutting height: 35-65mm
Grass collector: 35L
Weight: 11.3kgs
Average run time: 40 mins
Reasons to buy
+Well designed+Great handlebar+Superb battery+Cuts exceptionally well+It mulches too
Reasons to avoid
-Battery needs a firm push to engage-Yellow might not be to everyone's taste

We’ve found that the majority of the mowers we test cut grass exceptionally well, which is ultimately what they were designed for. Yes, some are a bit better at doing the edges while others are easier to manoeuvre. But in the main, we’ve found that the biggest differences – and why one mower in the same price band is ultimately better than another – lie in the construction and design of the handlebar interface, the cutting height mechanism, the power of the motor, the battery system, the mower’s weight and its asking price.

In our opinion, this new Kärcher – a first for the German company best known for pressure washers – meets all the above criteria. For starters, it looks pretty cute in all that bright yellow livery – you certainly won’t lose it – but, more importantly, it’s also very well assembled for a cordless model at this relatively low price band.

Although the handlebar system adopts the standard budget-priced wing-nut system for tightening, it’s a much more sturdy set up than others on the market and also height adjustable to some degree. The whole handlebar system can either be folded over for storage or, for an even more compact package, removed entirely. We also love the feel of the spongy handle and power levers. The four-level cutting height lever, meanwhile, is of the cheaper variety, but it works perfectly well.

The big 18v 5ah battery is another brilliant facet because its edges are coated in a rubbery texture that should theoretically prevent the plastic housing from cracking if dropped from a low height (it happens, dude). Uniquely, it also features a useful LCD screen that displays the remaining battery juice as a percentage and as a countdown in minutes when charging. This writer got about 40 minutes of use out of it (four cutting sessions), though it did take about two hours to fully charge. I should add that the battery needs to be pushed in firmly till you hear a click. You may even need to give it a good old shove to engage. Bear this mind, because some users have returned their units thinking they weren't working.

The Kärcher’s 33cm cutting deck, 35-litre grass catcher and descent cutting height range make the mower suitable for any small-to-medium sized lawn. What’s more it also comes with a mulching plug for those who want to feed nitrogen-rich cuttings back into the lawn. This writer was very impressed with how well this little Kärcher cut. It never bogged down even in longer grass and it cut right to the edge like most Bosch models do. It also left a nicely manicured finish in its wake.

If you’re looking for a lightweight and efficient lawn surfer that performs exceedingly well, then consider putting this one at the top of your list. It’s a right little cracker.

For those with a medium-sized lawn, Kärcher also produces a larger 36cm model. Just in case you were interested.

To see how our number one choice of wireless lawnmower stacks up against some quality opposition, be sure to check out T3's Kärcher LMO 18-33 vs Flymo EasiStore 300R Li comparison feature.

Greenworks GD60LM46SP Best cordless lawn mower 2021

2. Greenworks GD60LM46SP

Best self-propelled cordless lawn mower for large gardens

Power: 60v
Deck size: 46cm
Cutting height: 25-80mm
Grass collector: 55L
Weight: 28kgs
Average run time: 80 mins
Reasons to buy
+Vari-speed self propulsion+Metal cutting deck+Wide handlebar adjustment+Top build quality+Great value
Reasons to avoid
-Too large for small lawns-Very heavy

Here’s a model that screams ‘buy me’, and for more reasons than just the way it looks, which is frankly fantastic. Aside from boasting a durable long-life 46cm steel cutting deck that’s a perfect size for up to half an acre and possibly more, this exceedingly powerful 60v model is also equipped with variable-speed self propulsion, a long-life brushless motor, a mulching plug and side chute and a large 55-litre fabric grass collector. It doesn’t come with a battery or charger so bear that in mind when ordering.

The Greenworks’ self propulsion speed is adjusted using a rocker throttle with two little icons on either side – a snail for a slow, comfortable walking pace and a hare for what can only be described as a brisk march. In our test, it cut a swathe of lawn with effortless precision, never once bogging down, even when it hit a stretch of really tall grass.

Its seven cutting heights (25mm to 80mm) are effortless to adjust using a large lever on the right and its two-way folding handlebar system is superbly designed and capable of being used at three different height positions, including one low enough for someone under five feet tall. The whopping 60v battery provides between 60 and 80 minutes of cutting time on the slowest self-propulsion setting.

Despite its size and weight (28kgs), the Greenworks GD60LM46SP is surprisingly easy to store without taking up too much space – simply fold up the handlebar assembly and store it in an upright position.

If you have a lawn in excess of 300 square metres and positively loathe mowing it, then this cool-looking lawn barber could be just the ticket to get you off your butt and onto the turf.

Kärcher LMO 18-36 Best cordless lawn mower 2021

(Image credit: Kärcher)

3. Kärcher LMO 18-36

Best cordless lawn mower for medium sized lawns

Power: 18v
Deck size: 36cm
Cutting height: 30-70mm
Grass collector: 45L
Weight: 14.2kgs
Average run time: 40 mins
Reasons to buy
+Matchless battery system+Good ride height lever+Adjustable handlebar+Superb performer

If the excellent little Kärcher reviewed above is too small a model for your sward, consider getting your palms around this equally excellent larger model which has a cutting deck of 36cm. Granted, an extra 3cm of blade width doesn’t sound like much but in the course of an average cut it will definitely shave off a few minutes. The larger 45-litre fabric grass collector (10 litres more) will also entail fewer trips to the compost heap. And like the smaller model, this one also comes with a mulching plug.

Aside from the larger body and bigger grass box, the 18-36 also benefits from a more widely adjustable folding handlebar so it’s arguably an even better choice for users of shorter stature. But perhaps the biggest improvement over the smaller model is the height adjustment method. Where the 18-33 involves a short bendy plastic lever that is admittedly a bit fiddly, this one has a whopping four-level gear stick that is a cinch to engage. Its cutting height range, too, is a bit wider than its diminutive stablemate.

The 18-36 uses exactly the same rubberised 18v 5aH battery and, as this writer has eulogised above, it’s the best cordless battery system I’ve thus far used. Its LCD not only displays accurate battery level in percentages, it just seems to go on and on. Like the smaller model, I’m guessing you’ll easily get 40 minutes of cutting time out of it. Just be sure to give the battery a firm shove when mounting it or the connection pins won't engage properly.

The 18-36 weighs more than the 18-33 and it’s not quite as effortlessly manoeuvrable, but it’s a no brainer if you have a medium-sized lawn.

Although Kärcher is more famously known for its pressure washers, it looks like the German company’s done its homework and produced a pair of brilliant mowers that compete very favourably with the more established brands. With a little luck it’ll introduce its even larger 36v model – replete with 46cm cutting deck and rear wheel drive – to the UK market. Until then, this one will do nicely.

To see how this top-rated mower stacks up against quality competition, then be sure to check out T3's Kärcher LMO 18-36 vs Gtech Cordless Lawnmower 2.0 comparison feature.

Gtech Cordless Lawnmower 2.0 Best cordless lawn mower 2021

4. Gtech Cordless Lawnmower 2.0

A top lightweight mower with excellent features

Power: 48v
Deck size: 42cm
Cutting height: 30-80mm
Grass collector: 50L
Weight: 13.5kgs
Average run time: 40 mins
Reasons to buy
+Cuts brilliantly well+Amazingly light+Variable speed motor+Excellent battery
Reasons to avoid
-Handlebar height non adjustable-Quite pricey

For a mower with a moderately large 42cm cutting deck, this is one of the lightest we’ve ever tested – so light you might think they’d forgotten to put a motor in it. 

Unlike most lawn mowers, the Gtech 2.0 adopts a different type of blade. In fact it’s half a blade with a counterweight on the other end. Made from carbon steel, the blade is said to be just as efficient while requiring less energy. All we know is that it cut our test lawn supremely well, and right to the edge of the border. Rather bizarrely, it also produced a completely different texture of cuttings that were much finer than most other mowers.

The motor’s worth a mention too, since it features automatic variable speed: in short to medium grass the blade rotates at a steady pace with little noise, but as soon as it feels the resistance of longer grass, it speeds up dramatically, cutting the offending fronds with effortless aplomb. Where the previous model’s not very good battery took five hours to charge, this one takes just 60 minutes for about 40 minutes of running time.

Noise level is another major consideration when purchasing any lawn mower. Where the original Gtech Falcon mower made quite a din, this one emits a low, unobtrusive growl that sounds quite different to other models. We suspect it’s the result of the half-blade assembly because the mower's handlebar vibrates a bit more than others, though not enough to spoil the party.

Instead of a telescopic handlebar system, this one folds twice and uses quick-release latches. The only real downside is that it can’t be adjusted for height and, as it stands, it feels almost too tall for this 5’6” lawnsmith.

Other welcome features include a fixed battery key that can’t be lost, a battery power indicator that is visible at all times and a large 50 litre grass collector that clips on and off with consummate ease.

If you have a small-to medium sized lawn and money isn't an issue, then slap your readies down on this one because it’s one of the lightest and most efficient cordless mowers we’ve ever tested.

Cobra MX3440V Best cordless lawn mower 2021

5. Cobra MX3440V

Excellent budget-priced cordless mower for urban lawns

Power: 40v
Deck size: 34cm
Cutting height: 25-75mm
Grass collector: 35L
Weight: 16.3
Average run time: 30 mins
Reasons to buy
+Easy to manoeuvre+Effective cutting+Quiet motor
Reasons to avoid
-Not for large lawns

Designed in the UK, this T3 Award-winning cordless Cobra is equipped with a small 34cm cutting deck and a 35-litre fabric grass collector, making it the perfect little mower for an average sized urban sward. Being so small and made almost entirely of plastic, it’s light enough to carry and a doddle to store. It’s also admirably quiet.

Despite using a brushed motor instead of a more expensive brushless one, this titchy mower really impressed us with its cutting efficiency, even in relatively long damp grass. We estimate about 30 minutes of use on a single one-hour charge of its Samsung battery – enough power to cover up to three separate sessions on a small 10m x 8m lawn. For added convenience, it has a battery power indicator just below the start button on the handlebar.

The Cobra sports five cutting heights (25mm to 75mm), a simple height adjustment lever that raises and lowers the entire body and, for the price, a very good collapsible handlebar system that incorporates quick-release clips instead of awkward screw threads. At a shade under £190 for the mower, battery and charger, this is a great value model that’s efficient, easy to manoeuvre and compact enough for easy storage.

We've got a great Cobra MX3440 vs Einhell GE-CM 18/33 Li comparison feature that supplies even more detail about this top cordless lawn mower.

Greenworks G40LM35 Best cordless lawn mower 2021

(Image credit: Greenworks)

6. Greenworks G40LM35

Another keenly-priced cordless mower for small to medium lawns

Power: 40v
Deck size: 35cm
Cutting height: 20-70mm
Grass collector: 40L
Weight: 15kgs
Average run time: 25 mins
Reasons to buy
+Easy to manoeuvre+Effective cutting+Quiet motor
Reasons to avoid
-Standard wing-nut handlebar

Here’s another top trimmer for small to medium sized city lawns. In our test the Greenworks performed very well, collecting every last tuft of turf while leaving a very smooth finish. It comes with a 35cm (14 inches) cutting deck, a 40-litre collapsible mesh grass collector, five cutting heights (20mm to 70mm) and an interchangeable 40v Li-ion battery that keeps the freakishly quiet brushed motor running at full tilt right up to the last drop of juice.

The Greenworks is a doddle to push around and, at 15kgs, it’s easy enough to carry. I managed to get three separate cuts out of the battery, equating to around 30 minutes of continuous use on a single charge. Available with or without a battery, the Greenworks is a great budget priced option for hassle-free cordless mowing of smaller lawns.

FlyMo Mighti Mo 300Li Best cordless lawn mower 2021

7. FlyMo Mighti Mo 300Li

Great mower for bijou gardens

Power: 40v
Deck size: 30cm
Cutting height: 25-65mm
Grass collector: 30L
Weight: 9.94kgs
Average run time: 25 mins
Reasons to buy
+Great for small lawns+Compact and light+Easy on the ear
Reasons to avoid
-Rather a narrow cut-Small grass collector 

This cordless Flymo has the narrowest cutting deck on this page (30cm) so definitely consider it if, like most townies, you have a titchy lawn. You shouldn’t have any problems storing it either since it’s not only the smallest folding mower we’ve come across but, at 9.9kgs, it’s the lightest, too. It even comes with a handle for easy lifting.

I shoved the convenient height-adjuster down a notch or two and gave the mower a spin in some three-inch grass. The little fella trundled straight through it, snipping here, snipping there without breaking into a sweat and doing a rather good job, despite leaving a few wheel marks in its wake. It also cut pretty close to the edge and was one of only a small handful of mowers quiet enough to not scare the neighbour’s rabbits.

The Mighti Mo’s 40-volt Li-Ion battery packs a powerful punch and will trim around 250m2 of lawn on a single two-hour charge. However, the plastic grass collector is relatively small (30 litres) so expect semi-regular trips to the compost heap.

Bosch CityMower 18-300 best cordless lawn mower 2021

(Image credit: Bosch)

8. Bosch CityMower 18-300

A great little lightweight cordless mower for small lawns

Power: 18v
Deck size: 34cm
Cutting height: 30-60mm
Grass collector: 31L
Weight: 9.9kgs
Average run time: 25 mins
Reasons to buy
+Bosch build quality+Motor management+Hot swappable battery
Reasons to avoid
-Styling on the bland side

The new Bosch CityMower weighs just 9.9kg so it’s really easy to push around and carry between lawny sections. Crucially, it comes fitted with Bosch’s comfy Ergoflex handlebar system that is perfect for both righties and lefties.

For those with a typical urban lawn (think your average London abode), this thing passes much muster. Its height adjustable 34cm cutting deck and 31-litre grass collector are of optimum size for a 300 square metre lawn and, because it's fitted with extended grass combs, it also cuts right to edge of the lawn. And that means less strimming.

The CityMower has also got a clever processor on board that ensures the blades maintain a constant speed through any length of grass, thereby allegedly increasing the 18v battery’s capacity by up to 20%. Even with that boost, the mower will run for about 25 minutes on a hour-one charge, which is about average for a mower of this dimension. 

The CityMower comes with a battery but if you already own a set of Bosch power tools that use the 18v system then opt for the ‘solo’ model and use one of your now batteries instead.

This little compact mower cuts exceptionally well and is light enough for even the weakest knee’d lawnsmith to push around and carry. And being a Bosch, you can be sure it’ll go on running for many summers.

Stihl RMA 339 C Best cordless lawn mower 2021

(Image credit: Stihl)

9. Stihl RMA 339 C

Unique one-armed garden bandit

Power: 36v
Deck size: 37cm
Cutting height: 20-70mm
Grass collector: 40L
Weight: 16kgs
Average run time: 40 mins
Reasons to buy
+Brilliant mono bar design+Superior performer+Stihl reliability+Folds in a thrice
Reasons to avoid
-Not easy to assemble

Stihl swaggers onto the lawn with a stupendous machine that looks like no other mower this reviewer has ever seen. Instead of a standard two-strut handlebar that’s awkward to fold and a bit rickety, the RMA 339 comes with an unflinchingly solid mono bar that simply unlatches and folds over on itself. Had I been pedantic enough to time an unfolding and folding test, this model would have walked it. The bar can also be easily adjusted to two heights with a simple flick of a latch.

However, it’s not so much the folding aspect that makes this handlebar arrangement so unique, it’s the massive amount of free space it provides on the left hand side when it’s time to lift out the grass catcher. With other mowers, the act of removing the grass box involves two moves: one to unlatch the box from between the handlebar and the other to reach around the back of the handlebar to pick it up. By contrast, with this model you simply lean down, unlatch the collector and pick it up. All in one tidy move. Granted, it’s the not the most convenient thing ever invented – and it might even be a hindrance to some southpaws – but it genuinely makes removing the grass box a more pleasurable experience – if removing a grass box can ever be considered pleasurable. Another handy facet is that the all-plastic 40-litre grass collector can be unhinged at the back to empty it all at once without having to shake it up and down. Oh, and it fits into the mower’s housing with no jiggling whatsoever – a major bonus!

From a mowing point of view – which is, after all, what you’re most interested in – the Stihl is a lawn virtuoso, cutting grass evenly and with little fuss, almost to the very edge. It’s quite heavy but easy to manoeuvre and its wide 37cm cutting deck is a great size for medium sized lawns. The height adjuster is one of the best yet – just pull the handle out a few centimetres and lift or lower the cutting deck with almost zero effort.

Like the Gtech and smaller Stihl model further down this list, this model also features automatic blade speed adjustment. This means that in standard-length grass the motor hums along at low revs, saving battery power in the process. But when it detects a section of long grass, it seems to almost double the power, scything through it like a knife through blancmange. As soon as it’s passed through, the motor reverts to its more sedate pace again. You can safely expect about 40 minutes of cutting time on a full charge.

As is the case with most Stihl products, this mower is usually sold without a battery or charger but if you already own any Stilh products that already use the 36v system, you can simply hot swap between tools.

For the well-heeled lawnsmith looking for a reliable, efficient and superbly designed mower that’s actually a pleasure to use, this Teutonic model is about as impressive as it gets, even if it is a struggle assembling it out of the box. Nevertheless, its higher price means it comes in just a tad behind its compatriot, the titchy Kärcher above.

Cobra MX4340V Best cordless lawn mower 2021

(Image credit: Cobra)

10. Cobra MX4340V

Very keenly-priced wide-bodied cordless mower for larger lawns

Power: 40v
Deck size: 43cm
Cutting height: 25-75mm
Grass collector: 50L
Weight: 18kgs
Average run time: 50 mins
Reasons to buy
+Excellent price+Big 43cm cutting deck+50-litre grass box+Great performer+Long running time

•Buy the Cobra MX4340V direct from Cobra

Like small city cars vs large cars, bigger mowers tend to feel and look more luxurious. They are also likely to be equipped with fancy telescopic handlebar systems and slick cutting height adjusters. As a consequence, large-bodied mowers are also proportionately more expensive to buy than their smaller brethren. But what if you had a large suburban lawn and didn’t want to spend a fortune on a cordless mower big enough to handle it?

Enter this new wide-bodied stablemate to the T3 award-winning MX3440V reviewed below. The MX4340V has a wide 43cm (17-inch) cutting deck, 50-litre fabric grass collector and a brushless motor that are all on a par with premium-priced models like the Ego, Gtech and Greenworks. However, this model costs almost half the price, complete with 40v 5Ah battery and charger. Uniquely, it even has a battery power indicator on the handlebar assembly to let you know how much juice is left. And speaking of juice, you should get up to 50 minutes of running time out of it which is exemplary for a mower of these dimensions.

Yes, the folding handlebar system isn't as posh as some of the more expensive models but, guys, it’s a mower not a status symbol. It’s for cutting grass not cruising around Harrods. So, if you want a great value option for a larger lawn that does the job exceedingly well with zero hassle, then this is the model to go for. 

Ego LM1701E-SP Best cordless lawn mower 2021

(Image credit: Ego)

11. Ego LM1701E-SP

Another excellent self-propelled model for larger gardens

Power: 56v
Deck size: 42cm
Cutting height: 25-95mm
Grass collector: 55L
Weight: 27kgs
Average run time: 15 - 50 mins
Reasons to buy
+Self propulsion+Excellent performance+Superb construction+Lovely handlebar system
Reasons to avoid
-Heavy-Supplied battery runs out quickly

At 27 kgs, the new Ego is a weighty beast but then it does come equipped with a gargantuan 56-volt Li-Ion battery that looks like a power-up from Halo.

Unfortunately, the supplied 2.5Ah battery only provides about 15 minutes of cutting time which isn’t long enough for the size of lawn the mower’s designed for. We would recommend forking out on the optional 5Ah battery which runs for a much more useful 35 mins or, for even greater range, the 7.5Ah version which powers the mower for a substantial 50 minutes on a single charge.

Like the larger Greenworks reviewed above, this mower also features vari-speed self propulsion, so if you have a medium-to-large lawn but can't be arsed with pushing, then this is the model for you. And if you prefer to mow during the dark (no we haven’t met anyone who does that either) then this model is fitted with LED headlights, presumably so you can avoid decapitating moles or gophers.

The Ego’s wide 42cm blade scythed through everything with confidence and we loved the vari-speed self propulsion which can easily be set from a really slow walking pace to a spritely spring in the step. The huge 55-litre grass collector, meanwhile, ensures fewer trips to the compost heap. 

The Ego features a superb telescopic handlebar system that can be adjusted to three heights. It also folds up into a surprisingly small and tidy package for upright storage.

If you’re in the market for a well engineered medium-sized mower that has the power to deal with even the longest and wettest grass then this one does the job remarkably well. However, we would advise adding an extra 5aH or 7.5aH battery to your shopping basket because the low capacity one sold with it won’t take you very far.

Why a cordless lawn mower is usually the best lawn mower

For most lawnsmen (lawnspersons?), we'd now recommend a cordless mower such as the ones listed here. 

That's because there are few less compatible duos than a 240-volt electric cable and a fast-spinning blade, and with UK garden sizes ever shrinking, petrol mowers are just totally OTT for most people, especially in cities. 

Standard electric lawnmowers are not only potentially dangerous but they take much, much longer to cut a lawn simply because of the time spent grappling with the cable. Most modern battery-powered cordless mowers, on the other hand, are as powerful as their wired counterparts, but much less hassle to use. In fact, we estimate that the whole cordless mowing process from getting it out of the shed to finishing the job is almost twice as fast as when using a corded model.

However, some cordless models may struggle in extra long grass so best avoid tackling any untamed pastures (we’re talking really long grass here, the sort that has never seen a lawnmower). 

If cutting grass that's about six inches long, fear not if your cordless model cuts it unevenly, leaving chunks of flattened grass in its wake. This is normal for any mower doing its first-of-the season cut. The secret is to set the cutting deck to the highest setting and running over the lawn again in the opposite direction. Better still, leave it after the first cut and return a day or so later for its second cut. Then gradually lower the cutting deck for subsequent sessions until it looks like a golf course fairway.

Cordless mowers' lithium-Ion batteries are relatively quick to charge and provide between 25 and 60 minutes of hassle-free mowing, which is plenty long enough for the average UK garden.

What is the best battery-powered lawnmower?

We believe in making chores as easy as possible, so we strongly recommend cordless, electric lawnmowers for most garden owners. 

Our new current top pick for small urban lawns is the keenly-priced LMO 18-33 from Kärcher, hotly followed by the excellent mono-handled Stihl RMA 339 C. The new large-bodied Cobra MX4340V and Kärcher LMO 18-36 take spots #3 and #5 respectively. 

However, there are plenty of other great choices for you to browse through below.