Riding & Robot Mowers
What does a robot mower cost to run?
Not one maker publishes the battery capacity, so nobody can compute the electricity exactly. Here is the ceiling, and the cost that actually matters.
Affiliate disclosure: we earn a commission if you buy through our links, at no extra cost to you. It never changes which product we rank first — here is how we're funded.
We have not tested these units. Every spec on this page comes from the manufacturer's own documentation and is linked to it. Every computed figure is arithmetic you can redo. Prices are checked daily — last verified November 4, 2026. Here is exactly how we pick.
"What does it cost to run?" is a fair question with an unsatisfying answer. Every robot mower maker publishes run times, and not one publishes the battery capacity that would turn those minutes into kilowatt-hours. So this page does the next most useful thing: it puts a bound on the number and names the costs that are actually worth budgeting for.
The short answer
The specification nobody publishes
To compute energy you need capacity. Here is what the three robots in our registry publish, and what they leave out.
| Figure | Navimow i105N | Automower 410 iQ | Automower 435X AWD |
|---|---|---|---|
| Run time per charge | 60 min | 84 min | 145 min |
| Charge time | 90 min | Not published | Not published |
| Battery capacity (Wh) | Not published | Not published | Not published |
| Charger input rating | Not published | Not published | Not published |
| Energy per charge | Not computable | Not computable | Not computable |
| Working area | Up to 1/8 acre | 0.5 acre (+/-20%) | 0.9 acre (+/-20%) |
Transcribed from the Navimow i105N, Automower 410 iQ and 435X AWD product pages.
What we can say: the walk-behind comparison
Two independent acreage ratings — Greenworks at 320Wh for half an acre, Kobalt at 640Wh for a full one — put a cordless walk-behind at about 640 watt-hours per acre. That is a real, published anchor, and it bounds the discussion.
Even if a robot used ten times the energy of a walk-behind across a season — and nothing published lets us say whether it does — the electricity would still be a small number. The purchase price dominates this decision, which is what our is a robot mower worth it page is really about.
The costs that actually matter
- Blades. Robots use small pivoting razor blades rather than one big steel blade, and they are consumables. Husqvarna publishes three pivoting razor blades on the 410 iQ; neither maker publishes a replacement interval, so budget for them without being able to plan them.
- The boundary wire, if there is one. Aeration, edging and digging all cut wire. A wire-free machine removes this cost entirely — see wire-free robot mowers.
- Winter storage. Both Husqvarnas and the Navimow are light enough to carry indoors; what nobody publishes is a storage temperature range for the pack.
- Your time, saved. The entire value proposition is that the mowing stops being a task. Our DIY vs hiring a service page prices the alternative.
The three machines this applies to
The Navimow i105N publishes the most: 60 minutes of running against 90 minutes of charging, 58 dB(A), 24 lb, and up to an eighth of an acre.
#ad Check the Segway Navimow i105N Robot Mower price on Amazon — how we're funded.
The Automower 410 iQ covers half an acre on 84 minutes per charge against a published 108 minute recharge, and publishes no battery capacity.
#ad Check the Husqvarna Automower 410 iQ price on Amazon — how we're funded.
The 435X AWD trades area for traction: 0.9 acre, 145 minutes, and a 70% slope limit.
#ad Check the Husqvarna Automower 435X AWD price on Amazon — how we're funded.
What we cannot tell you
We have not metered any of these machines. No maker publishes a battery capacity, a charger input rating, a standby draw or a blade replacement interval, and standby draw matters here because a robot sits on its dock most of the day. Any monthly cost figure you see for a robot mower — including from us, if we printed one — would be an estimate dressed as a specification, and we will not do that.
The products discussed
Specs are the manufacturer's own and linked to the page they came from. Prices come from a live daily check; where we have no verified price we say so rather than print a stale one.
Segway Navimow i105N Robot Mower
Segway · Navimow (self-contained) · Our score 8.0/10
#ad Price as of November 4, 2026. Prices change; we check daily. How we're funded.
No perimeter wire, 58 dB published, and an eighth of an acre it will cut while you are at work.
Published specs
| Coverage | Up to 1/8 acre |
|---|---|
| Cutting width | 7.1 in |
| Cut height | 2-3.6 in |
| Runtime / charge | 60 min run / 90 min charge |
| Navigation | RTK + Vision, wire-free |
| Max slope | 16 degrees |
| Noise | 58 dB(A) |
| Weight | 24 lb |
Source: Navimow i105N, navimow.com
60 minutes of run against 90 minutes of charge is a 60/150 duty cycle -- about 40%. Over a 12-hour window that is roughly 4.8 hours of actual cutting, which is the number that decides whether 1/8 acre is realistic for your grass growth rate.
What the numbers favor
- No perimeter wire to bury, cut or repair -- boundaries are set in the app
- 58 dB published, quiet enough to run while people are outside
- Publishes both runtime and charge time, so the duty cycle is computable
- 24 lb, light enough to carry to storage single-handed
What they don't
- 1/8 acre is a genuinely small lawn; Segway's own 0.15 acre figure is layout-dependent
- 7.1 in cutting width means many passes
- 16 degree maximum slope rules out a lot of real gardens
your lawn has slopes over 16 degrees or is over an eighth of an acre. Both are hard published limits, not soft ones.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Husqvarna Automower 410 iQ
Husqvarna · Automower (self-contained) · Our score 8.4/10
#ad Price as of November 4, 2026. Prices change; we check daily. How we're funded.
Half an acre at a 45% slope limit, and the rare robot that publishes both its mow time and its charge time so the duty cycle can be checked.
Published specs
| Max working area | 0.5 acre (+/-20%) |
|---|---|
| Area capacity | 0.25 acre irregular; 0.5 acre systematic |
| Max slope, inside | 45% |
| Max slope, at boundary | 15% |
| Cutting width | 9.4 in |
| Cut height | 1-4 in |
| Blades | 3 pivoting razor blades |
| Mow time per charge | 84 min typical |
| Charge time | 108 min typical |
| Boundary | Physical wire or virtual wire (EPOS) |
| Noise | 62 dB(A) |
| Battery | 5 Ah (voltage not published) |
| Weight | 38 lb |
| Warranty | 4 years |
Source: Automower 410 iQ, husqvarna.com
84 minutes of mowing against 108 minutes of charging is 84 / (84 + 108) = 44% of the day spent cutting. That is the second robot in our registry whose duty cycle can be computed at all -- Segway publishes 60 min run against 90 min charge for the Navimow i105N, which works out at 40%. A run time on its own tells you almost nothing; it is the pair of figures that says how much lawn a machine can actually keep up with.
What the numbers favor
- Publishes BOTH mow time and charge time, which almost no robot maker does
- 45% slope inside the installation, the same figure Husqvarna published for the discontinued 450XH
- Runs on a physical wire or a virtual one, so the boundary is not a single-choice decision
- 62 dB(A) published, and a 1 to 4 in cut height range -- neither of which the 450XH published
- 4-year warranty
What they don't
- Half an acre is 40% of what the discontinued 450XH was rated for (0.5 against 1.25)
- 15% maximum slope at the boundary is a hard constraint on where the edge can run
- Irregular lawns drop the rating to 0.25 acre, which Husqvarna publishes separately
- 38 lb is heavier than the 33.7 lb 450XH it replaces
- Battery is published as 5 Ah with no voltage, so watt-hours cannot be computed
your lawn is much over half an acre, or your perimeter itself climbs a bank. The boundary limit is 15% and the area rating drops to a quarter acre on an irregular plot.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Husqvarna Automower 435X AWD
Husqvarna · Automower (self-contained) · Our score 8.7/10
#ad Price as of November 4, 2026. Prices change; we check daily. How we're funded.
A published 70% slope limit inside the work area -- 35 degrees, the steepest figure any maker prints for a robot.
Published specs
| Max working area | 0.9 acre (+/-20%) |
|---|---|
| Max slope, inside | 70% (35 degrees) |
| Max slope, at boundary | 50% |
| Cutting width | 8.7 in |
| Cut height | 1.2-2.8 in |
| Mow time per charge | 145 min |
| Drive | All-wheel drive, pivoting rear body |
| Boundary | Physical wire |
| Weight | 39 lb |
Source: Husqvarna Automower 435X AWD, husqvarna.com
A percentage grade is rise over run, so 70% is arctan(0.70) = 35.0 degrees -- which matches Husqvarna's own stated 35 degrees exactly. Worth converting because makers do not agree on units: Segway publishes 16 degrees for the Navimow, which is arctan of 0.287, or a 29% grade. Same quantity, two conventions, and a factor-of-two difference in what the machines will climb.
What the numbers favor
- 70% inside the work area, the highest published slope figure in our registry
- All-wheel drive with a pivoting body to keep all four wheels loaded
- Publishes separate limits for slopes at the boundary (50%) and inside it (70%)
- Cut height range published, 1.2 to 2.8 in
What they don't
- 0.9 acre maximum, and Husqvarna qualifies it plus or minus 20%
- No charge time published, so the duty cycle cannot be computed as it can on the 410 iQ
- Boundary wire must be buried or pegged -- no wire-free option
- 39 lb, the heaviest robot we hold specs for
your lawn is flat. AWD costs runtime and money for traction you will never call on.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Where to buy the tools on this page
Amazon affiliate links, except where a product has no Amazon listing — those go direct to the maker and earn us nothing, and the button says so. We show no price we have not verified today, so where there is no live figure the link says "check price" and takes you to the listing to read it there.
Best wire-free robot for a small lawn
Segway Navimow i105N Robot Mower
Segway · Navimow (self-contained)
Best published slope limit on a half acre
Husqvarna Automower 410 iQ
Husqvarna · Automower (self-contained)
Best for steep slopes
Husqvarna Automower 435X AWD
Husqvarna · Automower (self-contained)
#ad As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. How we're funded.
Common questions
How much electricity does a robot mower use?
Is a robot mower expensive to run?
What are the real running costs of a robot mower?
Do robot mowers use more electricity than a regular mower?
How much does it cost to run a robot mower per month?
Sources
Read next
- Riding & Robot Mowers
Above an acre the question stops being which mower and starts being how many watt-hours.
- Is a robot mower worth it?
The hours-per-season arithmetic, and the published limits that decide it before price does.
- Best robot lawn mower (and the limits nobody puts on the box)
Coverage, slope limit and duty cycle -- the three published numbers that decide if a robot mower fits.
- Best robot mower for a small yard
Working area, duty cycle and noise for a small lawn, against the machine built for four times the ground.
- What does it cost to charge a cordless yard kit?
A mower charge is 0.42 kWh. The season arithmetic at the EIA published average rate.
- DIY lawn care or hire a service: which should you actually do?
The trade is hours, not money. The DIY kit, the season's hours, and what a service is better at.