Our verdict
Cobra's answer to the EGO LM1900E for buyers who want self-propel + stripes from a battery mower. The kit is fine; the brand is the question. Cobra batteries lose half their resale by year 3, so don't expect to recoup much used.
Pros & cons
Pros
- Self-propelled cordless with rear roller — uncommon combination
- Battery and charger included in price
- Cobra UK warranty support
- Mulch plug standard
Cons
- Cobra 40V batteries depreciate fast
- 40cm cut narrow for what costs £400
- Self-propel drive belt wear is common
Full specs
| Type | Cordless |
|---|---|
| Cut width | 40 cm |
| Engine / Power | Cobra 40V brushless |
| Weight | 18 kg |
| Deck | Plastic |
| Self-propelled | Yes |
| Rear roller | Yes (stripes) |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | 50 L |
| Suited to lawn | Medium |
| Noise level | 75 dB |
Buying second-hand
£140–240 used. Always insist on a runtime test — Cobra battery cells degrade faster than EGO/Makita. Self-propel belt slip under load is common; budget for a £25 belt swap if needed. Roller bearings same story as the petrol Cobras — check for play.
Where to buy the Cobra RM40SPC
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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 RM40SPC 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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