Petrol vs battery lawn mower: which is cheaper to own?
For a small or medium lawn the two are closer than the petrol tradition suggests — and the running costs pull in opposite directions. Fuel and servicing on one side, a wearing battery on the other. Here is the honest comparison.
- Petrol and oil every season — an ongoing cost that adds up
- Annual servicing: spark plugs, filters, oil changes, blade care
- More to go wrong with an engine over its life
- Strong power for long grass and large lawns
- Only the cost of charging — far cheaper than petrol and oil
- Little servicing beyond cleaning and blade care
- A battery that degrades over years and is the main replacement cost
- Quieter, cleaner, but weaker on very long or wet grass
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For a small to medium lawn, a battery mower usually wins the true cost of ownership: almost nothing to run, minimal servicing, and the only real long-term cost is an eventual battery. Petrol earns its keep on large lawns or long, tough grass where the extra power genuinely matters — but you pay for it every season in fuel and servicing, which is where the cheap-looking petrol mower quietly becomes the expensive one.
Run a real option through the calculator for a sourced, dated, confidence-graded true total — every running cost above, counted, with no product ranked above another for money.
Common questions
Considerably — charging costs far less than petrol and oil, and there is minimal servicing. The main long-term cost is an eventual battery replacement, which for a small to medium lawn still leaves the battery mower cheaper to own than petrol.
On large lawns, or long and tough grass, where the extra power genuinely matters and a single battery charge would not finish the job. For that use the power is worth the fuel and servicing; for an average garden it usually is not.
Petrol and oil every season, annual servicing (spark plugs, filters, oil, blades) and more to go wrong with the engine over time. These running costs are why a cheap petrol mower can cost more to own than a pricier battery model.
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