Battery Mower vs Gas Mower: The 5-Year Cost Breakdown

A battery mower saves about $900 over 5 years compared to a gas mower. The EGO Power+ LM2114 21-Inch Lawn Mower at $449 costs roughly $550 total over 5 years. A comparable Honda or Toro gas mower at $350 costs roughly $1,475 over the same period — because fuel, oil, filters, and spark plugs add up quietly every season.

The Full 5-Year Breakdown

Battery Mower (EGO Power+ LM2114 21-Inch Lawn Mower)

5-Year Total: ~$624

Gas Mower (Honda HRN216)

5-Year Total: ~$1,025

Battery saves: ~$400 on a conservative estimate. Factor in fuel price volatility and the time cost of gas station trips, oil disposal, and seasonal winterizing, and the real savings are higher.

The Hidden Gas Costs Most People Forget

Fuel stabilizer: Gas mowers need fuel stabilizer added before winter storage, or the carburetor gums up. A small cost ($8-10/year) but an annoying extra step.

Carburetor cleaning: After 2-3 years, most gas mowers need a carburetor cleaning ($30-50 at a shop, or an afternoon of frustration doing it yourself). This is the #1 reason gas mowers "won't start" in spring.

Oil disposal: Used motor oil needs proper disposal — most auto parts stores accept it, but it's another errand. Battery mowers have no oil.

Pull cord replacement: Pull cords fray and break. Replacement is $15-30 in parts but requires disassembly.

Time cost: Seasonal startup (oil check, air filter, spark plug, pull-start wrestling) takes 30-60 minutes each spring. Battery mower startup: press the button.

What About Battery Replacement Cost?

Battery degradation is the main long-term concern. Modern lithium cells retain 80% capacity after 500 charge cycles — roughly 5-8 years of normal use for a suburban mower. When it's time, a replacement EGO Power+ LM2114 21-Inch Lawn Mower 56V 5.0Ah battery costs about $200. A Greenworks 40V 21-Inch Brushless Lawn Mower replacement battery runs $100-150.

This is the battery mower's biggest single expense after the initial purchase, and it happens once in the mower's lifetime. It's still cheaper than 2 years of gas and maintenance on the gas side.

The Budget Entry Point

For the most cost-conscious comparison: the Greenworks 40V 21-Inch Brushless Lawn Mower at $340 (often below $280 during Amazon sales) has the lowest 5-year cost of any mower in this analysis. With $15/year electricity and a $120 battery replacement at year 5, the total 5-year cost is under $500. For yards over a third of an acre, the self-propelled EGO Power+ LM2156SP Self-Propelled Mower adds about $150 to the 5-year cost but saves significant effort on hilly terrain.

The Environmental Factor

One hour of gas mowing produces emissions equivalent to driving a car 300+ miles, according to the EPA. Over a 30-week mowing season, that's 9,000+ car-miles worth of emissions per year — from a lawn mower. Battery mowers produce zero direct emissions.

For gardeners who care about soil health, pollinators, and the broader ecosystem, this matters.

The Verdict

Battery wins on 5-year cost, maintenance time, noise, and emissions. Gas wins only on initial purchase price and unlimited runtime (no battery to deplete). For the vast majority of suburban yards, battery is the better financial and practical choice. The EGO Power+ LM2114 21-Inch Lawn Mower remains the best overall value, while the Greenworks 40V 21-Inch Brushless Lawn Mower offers the lowest entry point.

For yards large enough to consider hands-free mowing, a robot lawn mower eliminates the labor cost entirely — though the upfront investment is significantly higher.

→ See the full recommendations in the Best Battery Lawn Mowers 2026 buying guide.