Petrol vs Electric Lawn Mower: The Honest Comparison
This is the most common mower question in 2024. The answer depends entirely on your garden size, terrain, and how much you value convenience vs performance.
Petrol Mower Advantages
- No cable or battery limit — mow any size garden without stopping
- Full power on slopes, thick grass, and wet conditions
- Faster cutting speed and higher blade torque
- No need for charging between sessions
- Models available up to 56 cm cut width for large properties
Electric (Cordless Battery) Mower Advantages
- Zero engine maintenance — no oil changes, carburettor cleaning or spark plugs
- Quieter — 65–75 dB vs 90–95 dB for petrol
- No fumes, suitable for enclosed or urban gardens
- Instant start every time
- Lower running costs (electricity vs petrol)
The Battery Limit Reality
A 4.0 Ah lithium battery on a 40 V mower handles roughly 400–500 m² per charge. For a 1,000 m² garden, you'll need two batteries or a mid-mow charge. High-end 6.0 Ah or dual-battery systems extend this to 700–900 m², but add cost.
Which Wins on Slopes?
Petrol. On gradients above 15°, electric motors lose torque as battery charge drops. A petrol engine with rear-wheel drive maintains consistent power from a full tank to the last drop.
The Maintenance Reality for Petrol
Annual service: oil change (15 min), air filter check/replace (5 min), spark plug inspect (5 min), blade sharpen or replace (20 min). Total: under an hour per year. If this sounds like a burden, an electric mower is genuinely more convenient for small gardens.
Our Recommendation
- Under 600 m², flat: Cordless electric is excellent — quieter, easier, no maintenance
- 600–2,000 m² or any meaningful slope: Petrol self-propelled is the better choice
- Over 2,000 m²: Petrol self-propelled minimum, consider ride-on
FAQ
Can a cordless mower handle thick or overgrown grass?
Modern 40–80 V brushless cordless mowers handle medium-thick grass well. For very overgrown or coarse grass, a petrol mower with higher torque is more reliable.
