Our verdict
A reasonable budget cordless if you do not care about ecosystem lock-in. The Greenworks G40 does the same job slightly better and has a bigger user base.
Pros & cons
Pros
- Battery included in price
- 40cm cut decent for the money
- Mulch plug standard
- Cheap entry to cordless
Cons
- Cobra battery platform isolated — no cross-tool benefit
- Plastic build
- 3-year warranty but support thin
Full specs
| Type | Cordless |
|---|---|
| Cut width | 40 cm |
| Engine / Power | Cobra 40V brushless |
| Weight | 16 kg |
| Deck | Plastic |
| Self-propelled | No |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | 45 L |
| Suited to lawn | Medium |
| Noise level | 75 dB |
Buying second-hand
£90–170 used. Cobra batteries hold no resale value, so a tired battery destroys the deal. Always demand a 20-minute runtime demo. The deck is plastic and the wheel mounts crack — inspect them carefully.
Where to buy the Cobra MX4140V
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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 40cm 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 |
Fair-offer calculator
Tell us about a specific used listing for the Cobra MX4140V 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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