Our verdict
The accessible robot for buyers who want to try the category without spending £1000+. Will not match a Husqvarna 305 for longevity but costs half as much used. A reasonable starter for a small simple lawn.
Pros & cons
Pros
- Cheapest reputable robot at Argos
- Boundary wire installation manageable
- 3-year Yard Force warranty new
- High used supply
Cons
- Yard Force support is patchy
- Battery cells degrade faster than Husqvarna
- App is basic
Full specs
| Type | Robotic |
|---|---|
| Cut width | 18 cm |
| Engine / Power | Yard Force brushless |
| Weight | 8 kg |
| Deck | Composite |
| Self-propelled | Yes |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | — |
| Suited to lawn | Small |
| Noise level | 58 dB |
Buying second-hand
£100–250 used. Boundary wire is the #1 fail point — walk every metre. Yard Force batteries lose capacity after 2–3 years; demand a runtime test. Reset the Yard Force app before purchase. Avoid any with rust on the underside.
Where to buy the Yard Force LM C40A
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Repair-cost reference
UK 2026 ballpark prices for the parts you're most likely to need on this mower. OEM is dealer-genuine; aftermarket is what you'll find on eBay or generic small-engine suppliers. Use these to sense-check any quote and to negotiate on used buys.
| Part / job | OEM | Aftermarket |
|---|---|---|
|
Replacement 18cm blade
Annual sharpening is free; replace when bent or cracked.
|
£24–£32 | £8–£12 |
|
Replacement battery
Wear part — typical 3–5 years to 80% capacity. The biggest single repair cost on any battery mower.
|
£90–£180 | £55–£120 |
|
Mainboard / control unit
Failure typically requires dealer fit. Not economic past 8 years on entry-tier robots.
|
£180–£320 | — |
|
Boundary wire repair (per splice)
Most common robotic fault — see /blog/robotic-mower-boundary-wire-repair.
|
£12 connector | £4 |
Fair-offer calculator
Tell us about a specific used listing for the Yard Force LM C40A you're looking at. We'll compute a fair offer range from our used-market data and the condition signals you provide.
Calculations are guidance, not gospel. Used-market prices vary by region (Scotland is typically 10–15% cheaper than the South-East), season (October cheapest, March most expensive), and seller motivation.
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