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Petrol mowers are noisy, smelly, and need fuel. Corded electric mowers tether you to a plug socket. Cordless lawn mowers fix both problems. You press a button, grab the handle, and get on with it.

But choosing the right one takes more than glancing at the price tag. Voltage, amp-hours, cutting width, brushed or brushless — there's a lot to work through. This guide covers everything you need to know before you buy.

Why Choose a Cordless Lawn Mower?

The freedom is the obvious reason. No cord to trip over. No petrol to buy or store. No engine to start on a cold morning. Just click in a battery and go.

Beyond that, cordless mowers are quiet. You can mow early on a weekend without waking the neighbours. They produce zero emissions at the point of use. And modern battery technology has closed the power gap with petrol to the point where most UK gardens are perfectly served by a good cordless model.

No cable: Move freely around the whole garden without extension leads
Low maintenance: No oil changes, spark plugs, or carburettors to worry about
Quiet operation: Typically around 75–85 dB — far quieter than a petrol mower
Instant start: Press a button and you're mowing within seconds
Battery sharing: Many brands let you use the same battery across multiple tools
Eco-friendly: No direct emissions during use

The main limitation is runtime. A battery runs out. For larger gardens, you either need a high-capacity battery, a spare, or a mower that supports dual batteries.

Understanding Battery Voltage and Amp-Hours

This is the spec that confuses most buyers. Let's break it down clearly.

Voltage (V)

Voltage is the power output — think of it as how hard the motor can work. Higher voltage generally means more cutting muscle, especially in thick or wet grass.

18V–24V: Entry-level and small-garden mowers. Fine for lawns mowed regularly and kept short. Runtime is typically 20–35 minutes.
36V–40V: The sweet spot for most UK gardens. Handles medium lawns and slightly longer grass with no fuss. Most popular voltage range in the UK market.
48V–56V+: High-performance machines for larger gardens and more demanding conditions. Longer runtime and more torque.

Some manufacturers get clever. Bosch, for example, use two 18V batteries wired together to deliver 36V equivalent power. The result is the same performance, but with the benefit of a shared battery platform across their tool range.

Amp-Hours (Ah)

If voltage is power, amp-hours are fuel tank size. A 2.0Ah battery is a small tank — lighter but it won't last long. A 5.0Ah or 6.0Ah battery will keep you mowing considerably longer.

For most medium UK lawns, a 5.0Ah battery at 36V–40V is the practical sweet spot. You get enough runtime to cover around 300–400m² in a single charge on normal-length grass.

Quick rule of thumb: Voltage × Amp-hours = watt-hours (Wh). A 40V 5.0Ah battery holds 200Wh of energy. A 36V 4.0Ah holds 144Wh. Watt-hours give you the clearest picture of total energy available.

Brushless vs Brushed Motors — What's the Difference?

You'll see "brushless motor" mentioned on almost every decent cordless mower. It's not just marketing. It genuinely matters.

Brushed Motors

A traditional brushed motor uses carbon brushes that physically contact a spinning part called the commutator. Friction generates heat. Heat wastes energy. Over time, the brushes wear down and the motor degrades. They're cheaper to produce, which is why they appear in budget models.

Brushless Motors

A brushless motor uses magnets and electronics instead of physical contact. No friction. Less heat. More of the battery's energy goes directly into cutting the grass.

In practical terms, a brushless motor gives you:

More mowing time from the same battery charge
More cutting power when you hit thick patches
A significantly longer motor lifespan
Better performance in wet or long grass

If a mower doesn't state it has a brushless motor, it almost certainly has a brushed one. For anything other than the smallest, most occasional use, brushless is worth the extra outlay.

Cutting Width: Match It to Your Garden

Cutting width is measured in centimetres and tells you how wide a strip the mower cuts on each pass.

A wider deck means fewer passes and a faster mow. But a wider mower is heavier, harder to steer in tight spots, and may not fit through a narrow garden gate. Measure your gate before you buy.

30–34cm: Small urban gardens up to around 100m². Light and easy to store. Look at lightweight cordless lawn mowers in this range.
37–42cm: Medium gardens up to 300m². The most common size for UK suburban gardens.
44–51cm+: Large gardens over 400m². Often paired with self-propulsion. Heavier but covers ground quickly.

Don't just think about coverage. Think about obstacles. Flower beds, trees, and tight corners are easier to navigate with a narrower deck.

Self-Propelled Cordless Mowers

A standard push mower requires you to supply the force. A self-propelled model drives its own rear wheels, pulling you forward as you steer.

Is it worth it? For any garden over 200m² — yes, significantly. It removes the physical effort of pushing, which becomes very noticeable on sloped ground. On a flat 100m² lawn, you probably won't miss it.

Browse our full range of cordless self-propelled mowers if your garden is large, has any notable inclines, or if you'd simply prefer less physical effort.

Rear Rollers and Lawn Stripes

That classic striped finish you see on cricket pitches and football grounds? It comes from a rear roller pressing the grass in alternating directions as you mow.

Not every cordless mower has a roller. If stripes matter to you, check for this feature specifically. Roller mowers also tend to give a cleaner edge when mowing right up to a border or path.

Our collection of cordless roller mowers includes models at various price points with roller systems designed to deliver a striped finish on standard UK lawns.

Mulching, Collecting, and Side-Discharge

What does the mower do with the clippings? Most UK cordless mowers offer two or three options.

Grass Collection Box

The most common setup. Clippings blow into a box at the rear. You empty it when full. Capacities typically range from 30 litres for small mowers to 50+ litres on larger models. A bigger box means fewer trips to the compost bin.

Mulching

The mower chops clippings into fine pieces and drops them back onto the lawn. Done properly, mulched grass decomposes and returns nutrients to the soil. It saves time because there's nothing to collect or compost. Works best when the grass isn't too long and is dry. Most mulching mowers come with a plug that blocks the collection chute — you swap it in when you want to mulch instead of collect.

Side Discharge

Clippings are thrown out to the side. Common on larger mowers. Useful for very long grass but leaves rows of clippings on the lawn that need raking or a second pass to tidy up.

Cutting Height Adjustment

Most cordless mowers offer between three and seven cutting height positions, typically ranging from 20mm to 70mm. Single-lever height adjustment across all four wheels is far more convenient than adjusting each wheel individually.

As a general guide for UK lawns:

20–30mm: Short, formal lawn finish
30–45mm: Standard domestic lawn, recommended for most of the growing season
50–70mm: Leaving it slightly longer in dry spells helps grass retain moisture and stay healthier

Battery Sharing: The Smart Way to Buy

Here's something many buyers overlook. Most major cordless power tool brands have a battery platform — one battery format that works across their entire range of tools.

If you already own a drill, hedge trimmer, or leaf blower from a brand, buying a mower from the same range means you can share batteries. You might be able to buy the mower as a "bare tool" — without battery and charger — and save £80–£150 in the process.

It also means one charger, one type of battery in the shed, and compatible spare capacity across tools.

Popular UK battery platforms include:

Bosch 18V/36V: Huge range of garden and power tools. See our Bosch cordless mowers range.
Ryobi ONE+: One of the biggest battery platforms globally — over 200 tools use the same 18V battery. Explore Ryobi cordless mowers here.
Greenworks 40V/48V: Strong garden tool ecosystem. Browse Greenworks cordless mowers in our range.
Worx PowerShare: Widely compatible across tools. Our Worx cordless mowers collection shows what's available.
Yard Force: Well-regarded for quiet, efficient mowing. Check out Yard Force mowers here.

Brand Overview: Which Should You Choose?

There are a lot of brands in the cordless mower market. Here's a quick, honest overview of the main players available in the UK.

Bosch

German engineering with a reputation for reliability and build quality. Their 36V Rotak range suits gardens up to around 500m². Their CityMower is a brilliant compact option for small urban gardens. Browse Bosch cordless mowers.

Flymo

A household name in the UK. Flymo's hover and wheeled cordless ranges are lightweight and easy to manoeuvre. Particularly good for smaller, awkwardly shaped gardens. Their EasiStore range folds flat for minimal storage space. See all Flymo cordless mowers.

Ryobi

Strong value across the board. The ONE+ battery platform is a major selling point — your mower battery works in their drills, trimmers, and blowers. Good for budget-conscious buyers who want to build a cordless tool collection. View Ryobi cordless mowers.

Greenworks

Greenworks punches above its weight at the mid-range price point. Their 48V models offer a wider 41cm cutting deck at a price well below comparable premium brands. Solid choice for gardens up to around 200m². Explore Greenworks cordless mowers.

Mountfield

Mountfield has been making lawn equipment for decades and their cordless range brings that experience to battery power. Good for medium to large gardens with a focus on practical, no-nonsense cutting performance. See Mountfield cordless mowers.

LawnMaster

An underrated brand in the UK. LawnMaster's brushless models include clever electronics that sense thicker grass and adjust power output accordingly. Competitive on price. Browse LawnMaster cordless mowers.

Kärcher

Best known for pressure washers, Kärcher's cordless mowers share their battery platform with their other garden tools. Neat build quality and reliable performance. See Kärcher cordless mowers.

Worx

Worx have made a strong impression with their Nitro brushless models. The WG737E in particular handles tough, long, and damp grass exceptionally well for its price bracket. The PowerShare battery platform is one of the most compatible in the market. Explore Worx cordless mowers.

Yard Force

Quiet, efficient, and well-built. Yard Force mowers are a solid choice if you prioritise low noise levels and a neat finish. Good for suburban gardens where noise matters. Browse Yard Force mowers.

Black+Decker

Reliable entry-level and mid-range options. A good starting point if this is your first cordless mower and you're not ready to spend on a premium model. Our Black+Decker cordless mower collection covers the current range.

Cordless Mower and Strimmer Combos

Your mower cuts the main lawn. But the edges along fences, walls, and borders? That's where a strimmer (also called a grass trimmer or line trimmer) earns its place.

Buying a mower and strimmer from the same brand on the same battery platform makes obvious sense. One battery charges both. One platform, fewer headaches.

Our cordless mower and strimmer collection brings together combination deals and compatible pairings from leading brands. If you're starting from scratch, this is often the most cost-effective way to kit out your garden for the season.

Weight and Manoeuvrability

A mower that's too heavy becomes a chore. Check the weight with batteries installed — not just the bare mower figure quoted in some specifications.

Under 12kg: Light and easy to handle. Good for smaller gardens and users who find heavy equipment difficult.
12–18kg: Standard weight for a mid-range cordless mower with a 36–40V battery installed.
18kg+: Heavier machines, usually at the large-garden end. Self-propulsion becomes more important at this weight.

If storage is tight, check whether the mower folds flat or has a compact storage position. Some models, like the Flymo EasiStore range, are specifically designed to stand upright against a wall to save shed space.

Grass Box Capacity

A larger grass box means fewer trips to empty it. Simple. For a 200m² lawn, a 40-litre box is adequate. For larger lawns, 45–50 litres will save you time.

Check how the box empties. Some tip cleanly with a single handle release. Others can be awkward with clippings that clump and stick. This sounds trivial until you're emptying it for the fourth time mid-mow.

Cordless Mower Safety Features

Modern cordless mowers include several safety mechanisms as standard.

Deadman handle: Release the handle and the blade stops within seconds. This is a legal requirement on UK mowers.
Safety key: Many models include a key or PIN that must be inserted before the mower will start — useful if children have access to the garden.
Motor protection: Brushless models typically include overload and overheating protection that cuts power before damage occurs.
Battery protection: Built-in electronics protect the battery from over-discharge and overcharging to extend battery life.

How Much Should You Spend?

Cordless mowers span a wide price range. Here's a realistic breakdown of what to expect at each level.

Under £150 — Entry Level

Basic 18V–24V mowers with narrower cutting widths (30–34cm). Brushed motors are common at this price. Suitable for small, flat lawns mowed regularly. Battery capacity is usually modest, giving around 20–30 minutes of runtime.

£150–£300 — Mid Range

The most populated segment. You start to see brushless motors, 36V–40V systems, and cutting widths of 37–42cm. This is the level where most UK suburban gardens are well served. Look for models with a 4.0–5.0Ah battery included.

£300–£500 — Upper Mid Range

Better build quality, more features (mulching, roller, self-propulsion on some models), larger batteries, and wider cutting decks. Suitable for lawns up to 500m².

£500+ — Premium

Self-propelled models with large-capacity batteries, wide cutting decks, and robust construction for large gardens or demanding conditions. Brands like Stihl, EGO, and high-spec Bosch models sit here.

What About Charging Time?

A standard charger takes 60–90 minutes to fully charge most mid-range batteries. Fast chargers can cut this to 30–45 minutes. If your lawn takes longer to mow than your battery lasts, either buy a spare battery or opt for a fast charger.

Dual-battery mowers let you install two batteries simultaneously. Some run both at once for extended power. Others switch automatically to the second battery when the first runs out, giving effectively double the runtime.

Cordless Mower Maintenance Tips

One of the biggest advantages of a cordless mower is how little maintenance it needs compared to petrol. But some basic care extends the life of the machine significantly.

Clean the deck after every use: Clippings build up under the deck and eventually affect airflow and cutting performance. A brush or damp cloth does the job.
Sharpen or replace blades annually: A dull blade tears the grass rather than cutting it cleanly, leaving ragged, yellow-tipped grass. Most blades are inexpensive and easy to replace.
Store batteries correctly: Lithium-ion batteries last longest when stored at around 50% charge in a cool, dry place. Storing them fully charged or completely flat shortens their lifespan.
Don't mow wet grass: Wet clippings clog the deck faster and put more load on the motor. If you must mow when it's damp, set a higher cutting height.
Check the wheels: Keep the axles clean and free of wrapped grass, especially on self-propelled models.

Frequently Asked Questions

Can a cordless mower handle long grass?

Yes, though with some caveats. A high-voltage brushless model with a decent amp-hour rating will tackle long grass well. The key is not to take off too much length in one pass. The "one-third rule" applies: never cut more than one-third of the blade length at once. For very overgrown lawns, raise the cutting height on the first pass and lower it again once the grass is back under control.

How long does a cordless mower battery last before it needs replacing?

A quality lithium-ion battery handled correctly should last 3–5 years or around 500 charge cycles. After that, capacity gradually decreases. Replacement batteries are available from most brands but do add to the long-term running cost.

Can I use a third-party battery in my mower?

Technically some fit. But third-party batteries often lack the communication electronics that protect the battery and motor. Using one can void your warranty and may damage the mower or the battery itself. Stick to the manufacturer's own battery range.

What's the difference between 36V single battery and 2x18V dual battery?

The performance is comparable — both deliver 36V equivalent power. The advantage of 2x18V is battery platform compatibility. If you own 18V tools from the same brand, you already have batteries that fit the mower.

Is a cordless mower powerful enough for slopes?

For moderate slopes, a 36V–40V brushless model handles the job well. Steep gradients demand more — look at self-propelled models in the 40V–56V range. If your garden has significant slopes, a self-propelled cordless mower is worth the investment.

Summary: How to Choose the Right Cordless Mower

Start with your lawn size. Then match voltage and battery capacity to that size. Then think about features — stripes, mulching, self-propulsion — based on how you want to use it.

Lawn Size	Recommended Voltage	Cutting Width	Suggested Type
Up to 100m²	18V–24V	30–34cm	Lightweight push
100–250m²	36V–40V	37–42cm	Push, consider roller
250–500m²	40V–56V	42–46cm	Consider self-propelled
500m²+	56V+	46cm+	Self-propelled, dual battery

If you already own power tools from a brand, stick to their battery platform. If you want lawn stripes, go for a cordless roller mower. If you want one purchase to cover both mowing and edging, look at our cordless mower and strimmer deals.

And if you're not sure where to start, browse by brand: Bosch, Flymo, Ryobi, Greenworks, Mountfield, LawnMaster, Kärcher, Worx, and Yard Force are all represented in our range.

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