How Long Do Robot Mowers Last? Battery, Blades & Body

“How long would it last?” is usually the last question before someone buys a robot mower, and it’s the right one. You’re paying $1,500 to $8,000 for a machine that works outside every day, in rain and summer heat, for years.

Here’s the honest answer: a robot mower is built to be kept running, not thrown away. The blades last weeks. The battery lasts about five years on a big lawn, and longer than the mower on a small one. The motors, chassis and electronics have no published life figure, and the wire-free RTK generation is only a few years old. What decides how long yours lasts is how hard it works and whether you replace the wear parts when they’re due.

How long does each part last?

Part	How long it lasts	What replacing it costs
Blades	4–6 weeks of daily mowing; 6–8 weeks on a lighter schedule	A few dollars a set — they’re thin razor blades, replaced, never sharpened
Cutting discs	Years. Replace if bent, cracked or out of balance	$125 for the Navimow X4 / Terranox disc set ($155 with blades fitted), $79 for a LUBA 3 AWD disc, $29 for a Yarbo disc and bolts
Battery	About 1,500 cycles near full on a Navimow pack. That’s ~3 years on 1½ acres, ~9 on ½ acre, and longer than the mower on ¼ acre	$220.79–$715.29 for Navimow packs, $209 for a LUBA mini 1500, $1,199 for the Yarbo Y Series
Tires and drive wheels	Wear items. Fastest where the mower crosses concrete, pavers or gravel every day	A service part, not a new mower
Motors and electronics	No manufacturer publishes a life figure, so we won’t invent one	Covered by warranty while it runs; a dealer repair after that
Software	As long as the maker supports the app and firmware	Usually free, and the real unknown for any connected product

Blades: weeks, and that’s on purpose

A robot mower’s blades are small razor blades on a spinning disc. They cut a few millimetres a day instead of a third of the blade once a week, so each blade does light work. They still dull. With daily mowing, plan on fresh blades every 4–6 weeks. On a lighter schedule with clean, established turf, it’s more like 6–8 weeks. Sandy soil is the biggest blade killer, then sticks, acorns, pine cones and wet, heavy grass.

They cost a few dollars a set, swapping them takes minutes, and the fresh screws in every kit matter more than people think. Our blade replacement guide covers the how-to and the screw rule.

The discs underneath last for years. You replace one when it’s bent, cracked or vibrating, usually after it hits something, not because it wore out.

Battery: five years to forever, depending on your lawn

A lithium pack isn’t rated in years. It’s rated in charge cycles, and one recharge is roughly one cycle. Navimow rates its packs to stay near full capacity for about 1,500 cycles, then fade gradually.

So the battery’s lifespan is really a question about your lawn. Here is what our battery model returns for the 12.8Ah Navimow pack, mowing about three times a week over a 30-week season:

Your lawn	Recharges per season	Near-full (no fade)	Until it dips under 80%
¼ acre	~85	~18 years	30+ years (outlasts the mower)
½ acre	~165	~9 years	~17 years
1 acre	~330	~4 years	~8 years
1½ acres	~500	~3 years	~5 years

At 80% the mower still works. It just covers a little less per charge. The full battery math explains why robot mowers are gentle on their packs: they charge shallow and often instead of draining to empty.

Can you replace it? Yes. On every machine we sell, the battery is a module, not glued into the chassis. On a Navimow X430 it’s a ten-minute job with a Torx bit. These are the replacement prices:

Mower	Pack	Replacement price
Navimow X315	6Ah	$220.79
Navimow X430 / X450	12.8Ah	$489.11
Navimow Terranox CM120M1 (3 acres)	20Ah	$645.96
Navimow Terranox CM240M1 (6 acres)	25Ah	$715.29
Mammotion LUBA mini AWD 1500	6.1Ah	$209
Yarbo Y40 / Y40P	38.4Ah Y Series	$1,199

Tires, motors and the body: the parts nobody publishes

This is where most “how long do they last” articles start making numbers up. We won’t.

Tires and drive wheels wear like any tire. They wear fastest on a mower that crosses a driveway, a paver path or a gravel strip every day. When the tread is gone, you order a service part. You don’t buy a new mower.

Motors and electronics are sealed and electric. There’s no engine, carburetor, belt, oil or spark plug, which removes most of what kills a gas mower. No manufacturer we sell publishes a motor or board life figure, though. What you do get is a warranty (below) and a dealer who can diagnose and repair the machine when the warranty runs out.

The chassis is plastic and rubber, rated to live outside. Sun, freeze-thaw and clippings packed against the housing are its enemies, and all three are easy to manage (see the list further down).

The software is the real unknown

A modern wire-free mower is a connected product. It positions off satellites, gets corrections from a base antenna or over the cellular network, and you run it from an app. Its useful life depends on its maker supporting that app and firmware.

That’s not a reason to avoid one. It’s a reason to buy from a brand with a real dealer network and a track record of pushing updates, and from a dealer who will still answer the phone in year six.

What warranty do robot mowers come with?

Brand / model	Warranty
Mammotion LUBA 3 AWD	3 years
Lopkin L2500	3 years on the mower, 2 on the battery
Yarbo (Y40, Y40P)	2 years standard, or 5 with the YarboCare 3-Year Extended Warranty
Navimow Terranox (commercial)	2 years on the mower and charging station, 1 on the battery
Navimow residential (X4, i2)	2–3 years depending on the model, so check the card in the box

We’re an authorized dealer and service center, so a warranty claim goes through us start to finish. You don’t ship the mower overseas or argue with a marketplace seller.

Be honest: nobody has 15-year data yet

Robot mowers aren’t new. Boundary-wire machines have been on European lawns since the 1990s, and well-kept ones are known for long service lives with a battery swap along the way. The wire-free, RTK-positioned generation is different. It’s only been on American lawns for a few seasons, so nobody, us included, can show you one that has mowed for fifteen years.

What we can tell you is what we know: the cycle math on the battery, the wear schedule on the blades, and which parts are designed to be replaced. A robot mower holds up because each of its wear parts can be swapped, unlike a sealed appliance you throw away when one thing breaks.

How to make a robot mower last

• Size it with headroom. A mower working well under its rating recharges less often per week, and every recharge is a battery cycle. That makes this the biggest lever on battery life.
• Match the drive to the ground. On a sloped lawn, all-wheel drive climbs where two-wheel drive spins, and spinning tires wear tires.
• Fresh blades on schedule. Dull blades tear grass and make the motor work harder.
• Keep the deck clean. Packed clippings add drag on the blade motor and hold moisture against the housing. How to clean a Navimow.
• Shade the dock. Heat is lithium’s enemy. A garage or a spot out of the afternoon sun keeps the pack cooler, and a rubber mat under the charging station stops the wheels from digging ruts into the approach.
• Store it right for winter. Clean it, store it indoors, and leave the battery at about half charge, not full or empty. Winterizing, step by step.
• Install the updates. Firmware updates are free, and they’re how the maker keeps improving the mower you already own.

What it costs to keep one running for ten years

Add it up honestly: blades a few times a season, electricity at a few dollars a month, and one battery pack somewhere in the middle. Our ROI calculator conservatively models a fresh pack every three years, which is more often than most lawns need. The total still usually comes in well under ten years of a lawn service, and the breakdown is in are robot mowers worth it?.

Want the number for your own lawn? Map it free. The tool measures your mowable area, sizes the mower to it, and runs the battery model on your lawn, so you see the year your pack would cross 80% before you buy.