Best Cordless Lawn Mowers Australia 2026:
Battery Platforms, Deck Sizes and What Fails First

Disclosure: This article contains affiliate links to amazon.com.au. If you buy through one of these links iFix may earn a small commission at no extra cost to you. It doesn't change which products we recommend. We focus on what actually lasts based on 16 years of repair-shop experience.

Why the battery matters more than the mower

The mower you buy this spring is really a decision about which battery you're going to own for the next ten years. Every cordless brand locks its packs to its own tools, so once you've got two 4Ah batteries and a charger on the shed wall, the line trimmer, blower and hedge cutter you buy later will almost certainly come from the same family. That's the part most people don't think about in the shop aisle, and it's usually the part that costs the most to undo once you've got three or four tools on the one pack.

Bosch sits in the Power for All alliance, which its listing says covers more than ten brands and over 150 products on the one 18V pack. Stanley FatMax V20 is its own 18V system. Greenworks and Hyundai Power both run 40V packs that only fit their own tools. None of these is wrong, but they're different bets, and I'd count the tools you already own before I counted cutting widths. If your drill already runs on one of these packs, that's generally the platform I'd stay on, because a second battery for the mower then doubles as a spare for everything else.

I've kept this guide to battery mowers sold with at least one battery and a charger in the box, between roughly $400 and $1,200 on Amazon AU, and I've left the skin-only listings out because a bare mower with no pack isn't comparable on price. If you're weighing up a robot instead, our robot mower guide covers the boundary-wire and wire-free options. Everything below is a walk-behind you push yourself, or in one case one that drives itself up the slope for you.

How big a lawn each deck really suits

Cutting width is the number on every box, and it's the easiest one to get wrong. A 34cm deck on a 300 square metre block means a lot of passes, and every pass is battery you're spending on walking back and forth rather than cutting. A 51cm deck covers half as much ground again on each pass, but it's heavier, harder to turn in a narrow side passage and it pulls more current through thick grass. The right width depends more on the shape of your yard than its size, so picture the tightest corner you mow before you look at the biggest number.

As a rough guide from what I see people buy, a 34cm deck suits a courtyard or townhouse lawn, something in the 42 to 46cm range suits most quarter-acre suburban blocks, and a 51cm deck makes sense when the lawn is open and mostly rectangular. Greenworks is the only brand here that puts an area figure on its listing, quoting up to 650 square metres from its 4Ah pack. I'd treat any area number as a best case on short, dry grass rather than a promise, and knock a third off it for the first cut of spring.

Height range matters too, especially on the Central Coast where buffalo and kikuyu lawns get left longer through summer. The Bosch 34 runs 25 to 65mm, the Bosch 43 goes from 30 to 75mm and the Greenworks spans 19 to 76mm over seven positions. If you like to leave buffalo long in the heat, check the top height before anything else, because a mower that tops out low will scalp the lawn every time the ground dips, and scalped patches are where the weeds get their start.

Volts, amp-hours and what runtime really means

Battery mowers get sold on volts, but runtime comes from watt-hours, which is volts multiplied by amp-hours. One 18V 4Ah pack holds about 72Wh. Two of them in the Bosch 18V2-43 or the Stanley give you around 144Wh, and a single 40V 4Ah pack in the Greenworks or Hyundai holds about 160Wh. Those numbers are close enough that real-world runtime will mostly come down to grass length, deck width and how wet the lawn is on the day, rather than the brand on the side of the deck.

The twin-pack mowers run both 18V batteries in series to make 36V, which is why they need both packs fitted before they'll start. That's fine until one pack starts to age faster than the other, and then the weaker pack sets the runtime for the pair. It's the same reason I tell people to buy matching packs and rotate them as a set, rather than pairing a new 5Ah with a tired 2Ah that's spent three years in the drill case. Mixed pairs are one of the more common reasons a twin-pack mower suddenly cuts out halfway through the back lawn.

Charging cost is tiny. At the Australian average tariff of roughly 33c per kWh, refilling a 160Wh pack from flat costs around 5 to 6c once you allow for charger losses, so running cost comes down to how long the battery lasts before it needs replacing. A replacement 4Ah pack usually costs a fair slice of what the whole kit did, which is why the storage and charging advice later in this guide is worth more to you over ten years than any spec printed on the box.

Brushless motors and what still wears out

Every mower in this guide uses a brushless motor, which is good news. A brushed motor wears its carbon brushes down against the commutator, and when they're gone the motor stops. A brushless one swaps those for electronic switching on a small controller board, so nothing inside the motor wears by design apart from the bearings. The trade is that the controller now does that job, and a controller that cooks itself in hot, damp clippings is one of the faults I see most often on cordless garden tools of every brand.

Decks are mostly polymer on battery mowers because weight is runtime. The Hyundai is the exception here with a steel deck, which shrugs off knocks but will rust at the edges if you leave wet clippings caked under it over winter. Plastic decks don't rust, but they crack where the wheel axles mount if the mower gets dropped off a step or slides off a ute tray. Neither is clearly better, and it mostly comes down to how rough you are with it and whether you'll hose the deck out after a wet cut.

Look at how the blade attaches too. Most of these use a single bolt through the blade into a hub on the motor shaft, and the hub is often designed to slip if you hit something solid, which protects the motor. Greenworks calls its version impact motor protection. Hit a tree root hard enough and you'll still bend a blade, but a bent blade is a part you can replace yourself on a Saturday morning, while a bent motor shaft usually means the mower's finished and the battery is all that's worth keeping.

Mulching, catching and side discharge

All five mowers here can catch clippings and all five can mulch, either with a mulch plug in the box (both Bosch models), a mulching kit (the Hyundai) or a 3-in-1 deck (the Stanley and Greenworks). Mulching chops the clippings fine and drops them back into the lawn, which saves emptying the catcher, but it works the motor harder and drains the battery faster. On long or wet grass I'd catch instead, and save mulching for the regular weekly cut when the clippings are short and dry enough to fall through.

Catcher size decides how often you stop. The Bosch 43 and the Greenworks both carry 50 litres, the Stanley has a 40 litre fabric basket and the Bosch 34 a 35 litre box. Fabric baskets breathe better, which keeps the airflow up as they fill, but the fabric wears through at the seams after a few seasons in the sun. Hard boxes last longer but clog sooner on damp grass, so the mower starts leaving clumps behind well before the box looks full. Either way, empty it before it's packed solid.

Side discharge only shows up on the Stanley, and it's handy for the first cut of spring when the lawn has got away from you. Greenworks lists rear discharge instead. If your lawn regularly goes three weeks between cuts, a discharge option saves a lot of stopping and starting, but on a lawn you keep on top of, a catcher and a mulch plug cover nearly everything you'll need. I wouldn't pay extra for a discharge chute unless you know you'll use it every spring and after every holiday.

Self-propelled or push

The Hyundai is the only self-propelled mower in this guide, and on a sloping block that's a real advantage. A self-propelled drive adds a second motor and a small gearbox on the rear axle, which is more to go wrong but saves your legs on hills. It also costs battery. Hyundai quotes 20 to 60 minutes of mowing per charge depending on load, and the low end of that range is roughly what I'd expect uphill in thick grass with the drive engaged the whole time.

The push mowers in this group are light enough that most people manage fine on flat ground. Greenworks lists 21kg without the battery and Hyundai says 19.9kg for its self-propelled model. Stanley says under 26kg, and its listing data puts the mower at about 21kg, so the real number with packs fitted sits somewhere in between. Bosch doesn't state a weight on either listing, which I'd check on the box before buying if you've got steps to carry it down or a high ute tray to lift it into.

If your yard has a steep bank, I'd lean towards the self-propelled Hyundai or keep a push mower and accept a slower cut on the slope. With any walk-behind mower, the usual advice is to mow across the face of a slope rather than up and down it, so the mower can't run back onto your feet, and to skip anything too steep to stand on comfortably. Wear closed shoes, and pull the key or the battery before you tip the mower to clear a jammed blade.

Batteries in an Australian shed

Lithium packs hate heat more than anything else, and a tin shed in January can sit well above 40 degrees all afternoon. Heat speeds up the chemistry that wears a cell out, so a pack stored hot and fully charged ages much faster than one kept cool at partial charge. If you can, bring the batteries inside or keep them in the coolest corner of the garage and leave the mower itself in the shed. It's the single biggest thing you can do to stretch a pack from four summers to seven.

Don't charge a pack straight after a long mow while it's still warm. Give it half an hour to cool first, then put it on the charger. Over winter, when the mower sits for months, leave the packs at roughly half charge rather than full, and check them every couple of months. A pack that sits completely flat for a whole winter can drop below the voltage its management board will accept, and then the charger refuses it, which looks exactly like a dead battery even when the cells are fine.

Only charge packs on the charger built for them. A no-name charger from a market stall might fit the rails, but it won't talk to the battery's management board the same way, and that's where swollen packs and melted terminals tend to come from. We've written more about this in our guide to bad chargers, and the same physics applies to a 40V mower pack as it does to a phone. Keep the charger off the shed floor too, where water pools after a storm.

How I picked these five

Every pick is sold new by Amazon AU itself, so returns and warranty go through Amazon's local process rather than an overseas seller. I checked each listing's model number, what's actually in the box and the sales rank on the day I wrote this. I left out a well-priced Senix 36V kit because its model code ends in EU, which can mean a European plug on the charger, and I'd rather not guess on a mains plug that'll be sitting in a damp shed.

I also skipped skin-only mowers, petrol mowers, robots and corded electrics, plus anything sold by a marketplace seller with no Australian presence. Where a listing contradicts itself, like the Stanley page quoting a leaf blower's airflow figures in its feature list, I've said so in the pick rather than repeat the number. Ranks are Amazon AU category ranks, and two of the five didn't have one published on the day I checked, which I've noted in their specs instead of guessing.

If you're kitting out the shed more broadly, our cordless drill kit picks are worth a look before you lock in a battery platform, because the drill usually ends up being the tool you use most. And if your existing mower has a battery or charger that's misbehaving, our Erina workshop can test the pack before you spend money on a whole new kit, since a tired pack is far less to replace than a mower.

The 5 picks, $410 to $640

Prices are Amazon AU at time of writing (20 October 2026) and move week to week. Ranks are Amazon AU category sales ranks, checked the same day.

Side-by-side comparison

What we see fail in the workshop: cordless mowers

Cordless mowers fail in different ways from petrol ones. There's no carby to gum up and no pull cord to snap, but there's a battery, a controller board and a charger, and those are the parts that come in. Most of these faults give some warning first, and catching them early often means a battery or a part rather than a whole new mower.

Decision tree: which one should you actually buy?

• Small courtyard or townhouse lawn? → The Bosch Rotak 18V-34 at $410: a 34cm deck, one 4Ah pack and a battery that fits a huge range of other tools.
• Typical quarter-acre suburban block? → The Bosch Rotak 18V2-43 at $640: 43cm deck, 75mm top height, 50 litre bag and two batteries in the box.
• Big, open, flat lawn? → The Stanley FatMax V20 at $499 has the widest deck here at 51cm, plus side discharge for the first cut of spring.
• Want one battery and the widest height range? → The Greenworks 40V at $549 cuts from 19 to 76mm over seven positions on a single 40V 4Ah pack.
• Sloping block or a steep bank? → The self-propelled Hyundai Power 42cm at $563 drives itself, though runtime drops on the uphill runs.
• Mower battery won't charge or cuts out mid-mow? → Stop charging it, especially if it's swollen or warm, and bring the pack and charger to our Erina workshop so we can tell you whether it's the battery, the charger or the mower before you spend anything.

Frequently asked questions

Are cordless lawn mowers as good as petrol mowers?

For most suburban lawns, yes. A modern brushless battery mower on a 36V or 40V system cuts a regular lawn as well as a small petrol mower, starts with a button, needs no fuel or oil changes and makes far less noise. Where petrol still wins is very large blocks, long overgrown grass and heavy commercial use, where runtime and raw power matter more. If your lawn takes under an hour to mow and you keep on top of it, a battery mower is the easier machine to own.

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

It depends mostly on how the pack is stored and charged rather than the brand. A lithium pack kept cool, stored at around half charge over winter and charged on its own charger can last many seasons. One that bakes in a hot shed at full charge, or sits completely flat for months, ages far faster. Capacity fades gradually, so you'll usually notice the mower doing less of the lawn per charge before it stops altogether. Matching packs and rotating them as a set helps twin-battery mowers last longer.

Is 18V or 40V better for a lawn mower?

Voltage alone doesn't decide it. What matters is watt-hours, which is volts multiplied by amp-hours, plus the deck size and motor. Two 18V 4Ah packs running together hold about 144Wh, while one 40V 4Ah pack holds about 160Wh, so they're close in practice. The bigger decision is the battery platform, because the packs only fit that brand's tools. If you already own 18V tools from one brand, staying on that platform is usually worth more than a few extra volts.

What size cordless mower do I need for my lawn?

As a rough guide, a 34cm deck suits a courtyard or small townhouse lawn, a 42 to 46cm deck suits most quarter-acre suburban blocks, and a 51cm deck makes sense on large, open, mostly rectangular lawns. Narrow side passages, garden beds and tight corners push you towards a smaller deck, while a big open area rewards a wider one. Runtime matters too, because a wide deck pulls more current, so a large lawn may also need a second battery.

Can I hose down a cordless lawn mower?

Don't hose the top of the mower, because water can get past seals into the motor controller and battery contacts. Take the battery out first, then tip the mower on its side with the motor housing facing up and brush or scrape the clippings out from under the deck. A damp cloth is fine on the top surfaces. Brush the cooling vents clear after each cut, and let the mower dry before you store it. A lot of the controller faults we see start with water.

Should I buy a self-propelled cordless mower?

If your block has slopes or a long uphill run, a self-propelled mower saves real effort. The drive adds a second motor and gearbox, which is more to maintain and uses more battery, so runtime per charge drops when the drive is engaged. On flat, smaller lawns a push mower is lighter, simpler and usually runs longer per charge. With any walk-behind mower, mow across the face of a slope rather than up and down it, and skip anything too steep to stand on comfortably.

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