Mowers
Gas vs Battery Lawn Mower: Runtime, Cost and Which to Buy
Quick answer
A battery lawn mower is the better choice for lawns up to about a third of an acre: the EGO LM2135SP runs up to 60 minutes, starts with a button and needs no oil. Gas is better for half an acre or more, thick grass or the lowest price: the self-propelled SENIX 22 in 201cc costs $399.00.
EGO POWER+ LM2135SP 21 in. Select Cut Self-Propelled Mower Kit
$749.0021 in, up to 60 min on a 7.5Ah battery.
Best for: Mid-size lawns, especially for existing EGO 56V owners
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SENIX 22 in. 3-in-1 Variable Speed Self-Propelled Gas Mower, 201cc
$399.0022 in, 201cc, rear-wheel drive.
Best for: Medium to large lawns with gentle slopes
Check price on AmazonThe dividing line is runtime. A 21-inch mower at a 3 mph walking pace covers about 0.43 acre per hour, so EGO's rated 60 minutes on the LM2135SP's 7.5Ah battery works out to about 0.4 acre in ideal conditions. Thick, tall or damp grass and bagging drain batteries faster. A half-acre lawn takes about 1 hour 9 minutes, which means a second battery or a mid-mow recharge. EGO's Rapid Charger refills the 7.5Ah pack in about 60 minutes.
Gas runs until the tank is empty and refuels in a minute, and it costs less up front: the SENIX lists at $399.00 against $749.00 for the EGO kit. Battery mowers win on starting, noise, fumes and maintenance. Estimate your runtime in the battery mower runtime calculator. Figures are from published specifications and owner reports, rather than side-by-side testing.
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How does a battery mower compare with a gas mower?
| Battery: EGO LM2135SP | Gas: SENIX 22 in 201cc | |
|---|---|---|
| Price | $749.00 with battery and charger | $399.00 |
| Deck | 21 in | 22 in steel |
| Power | 56V 7.5Ah; EGO lists up to 7.0 ft-lb torque | 201cc 4-cycle OHV |
| Runtime | Up to 60 min per charge | Until the tank is empty |
| Approximate area per charge or tank | About 0.4 acre in ideal conditions | Not limited by runtime |
| Drive | Touch Drive, 0.9 to 3.1 mph | Rear-wheel drive, variable speed, 11 in rear wheels |
| Clipping | Mulch and bag, interchangeable Select Cut blades | Bag, mulch and side discharge |
| Cut height | 1 to 4 in, 8 positions | 1.25 to 4 in, 6 positions |
| Starting | Push button | Pull start |
| Routine maintenance | Blade sharpening, cleaning | Oil, air filter, spark plug, fuel stabilizer, blade |
| Half acre, open lawn | About 1 hr 9 min: needs a second battery or recharge | About 1 hr 6 min; refuel in a minute if needed |
Area per hour = mph x 5,280 x (deck in x 0.85 / 12) x 0.8 / 43,560, at 3 mph. Runtime ratings are EGO's.
Should I buy a gas or battery lawn mower?
Choose battery if:
- Your lawn is under about a third of an acre, or you are willing to buy a second battery.
- You are tired of pull-starting, stale gas and spring tune-ups.
- You want to store the mower in a small space with no fuel smell.
- You already own EGO, Greenworks or another battery platform.
Choose gas if:
- You mow half an acre or more with a walk-behind.
- Your grass is thick, gets tall between mows or is often damp in the morning.
- You want the lowest purchase price for a self-propelled, bagging mower.
- You are comfortable doing basic engine maintenance.
How big a lawn can a battery mower cut?
It depends on battery size, deck width and grass, and maker ratings vary in how they are expressed. Greenworks rates its 80V 21 in self-propelled for up to half an acre on a 4.0Ah battery and its 80V 25 in for three quarters of an acre. Honda rates the HRX-BE at about 0.37 acre per 12Ah pack, with a second battery bay to double it. EGO rates the LM2206SP for up to 70 minutes on a 10.0Ah battery.
A realistic rule: a single battery handles a quarter to a third of an acre comfortably, and a second battery gets most people to half an acre. Past that, a wider deck or a riding mower is the better answer; see best mowers for half an acre.
Which is cheaper over 5 years, a gas or battery mower?
Running costs favor battery: a charge costs pennies, and there is no oil, spark plug, air filter or fuel stabilizer to buy each year. Gas running costs for a quarter-acre lawn are modest, though, and the battery mower usually starts a few hundred dollars more expensive. The deciding factor is the battery. If a pack lasts the life of the mower, battery wins over 5 years. If it needs replacing, the gap narrows or reverses. Warranty terms are the best guide: EGO lists a 5-year tool and 3-year battery warranty on its LM2114, Greenworks lists a 4-year tool and battery warranty on its 60V and 80V mowers, and Honda lists 5 years residential on the HRX-BE.
Enter your own numbers in the gas vs battery cost calculator.
Do battery mowers cut as well as gas mowers?
The better ones do on regularly maintained lawns. Blade tip speed and deck design matter more than fuel type, and several battery mowers add features to maintain cut quality: EGO's Select Cut interchangeable blades, Greenworks' SmartCut blades that add power in thick grass, and Honda's twin-blade MicroCut deck. Where battery mowers struggle is overgrown grass, where they slow down or drain quickly. Mow often, remove no more than a third of the blade height at once, and keep the blade sharp; that advice helps any mower. The mowing height chart gives the right height for your grass.
Which gas and battery mowers fit which lawns?
EGO POWER+ LM2135SP 21 in. Select Cut Self-Propelled Mower Kit
$749.00Up to 60 minutes on a 7.5Ah battery, Touch Drive speed control and three interchangeable lower blades for mulching, bagging or extended runtime.
Best for: lawns up to about a third of an acre
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$399.00A 201cc engine, 22-inch steel deck, rear-wheel drive with 11-inch rear wheels and three clipping modes.
Best for: half-acre lawns with gentle slopes
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Honda HRX-BE 21 in. Battery Self-Propelled Mower
$999.00A twin-blade MicroCut deck, 4-in-1 Versamow, a second battery bay and a 5-year residential warranty with dealer support.
Best for: buyers who want dealer service
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Greenworks 80V 21 in. Self-Propelled Mower Kit
$479.99Rear-wheel drive and an 80V brushless motor rated for half an acre on a 4.0Ah battery, with a 4-year tool and battery warranty.
Best for: half-acre lawns with some slope
Check price on AmazonHow we chose
We did not test these products in person. Picks are researched from manufacturer specifications and owner manuals, engine and safety certifications where they apply, warranty terms, public recall records, and the recurring themes in verified owner reviews. We favor established brands with large review counts and parts support, match each pick to a real yard size or task, and place it in the tier where its price and capability actually belong.
Frequently asked questions
Are battery lawn mowers worth it?
For lawns up to about a third of an acre, yes. They start with a button, need no oil, fuel or tune-ups, run quietly and store easily. The EGO LM2135SP is rated for up to 60 minutes on its 7.5Ah battery. For half an acre or more, thick grass, or buyers focused on the lowest purchase price, a gas self-propelled mower is still the practical choice unless you add a second battery.
How long does a battery lawn mower run?
Maker ratings in our catalog range from about 45 to 70 minutes per charge: Honda lists up to 45 minutes on the HRX-BE's 12Ah battery, EGO lists 55 minutes on the LM2114 and 60 minutes on the LM2135SP, and 70 minutes on the LM2206SP with a 10.0Ah battery. Tall, thick or wet grass, bagging and self-propel all reduce runtime below those ratings.
Can a battery mower handle a half-acre lawn?
With a second battery or a large pack, yes. A 21-inch mower at 3 mph needs about 1 hour 9 minutes for an open half acre, more than most single batteries deliver. Greenworks rates its 80V 21-inch self-propelled mower for half an acre on a 4.0Ah battery, and Honda's HRX-BE has a second battery bay. Otherwise, plan on recharging mid-mow.
Do battery mowers work on thick or tall grass?
They cut thick grass, but they slow down and drain faster, and very tall grass can stall them. Features like Greenworks SmartCut and EGO's high-torque motors help. The best approach is to mow more often, raise the deck for the first pass on overgrown grass, and never remove more than a third of the blade height at a time. Gas mowers are more forgiving of neglected lawns.
Is a gas mower louder than a battery mower?
Yes. Gas mower engines are loud enough that hearing protection is a sensible habit, and battery mowers are much quieter, with Greenworks describing its 80V mower as three times quieter than gas. Battery mowers are not silent, since the blade still moves air and grass. The lower noise makes early morning or evening mowing more neighbor-friendly and more comfortable for the operator.
Researched, not professional advice. This page is compiled from published specifications, manuals, labels and owner-review consensus, not hands-on testing. Follow the manufacturer's instructions and product label, and consult a qualified professional where safety, chemicals, fuel or structures are involved. As an Amazon Associate we earn from qualifying purchases.