Gas, battery and corded garden tools differ in more than power. This guide sets out what California’s rules for small engines mean for new gas equipment, then compares safety, operation and upkeep for each power type using CARB material, two operator manuals and University of Illinois Extension mower maintenance advice.

Short version: California’s zero-emission rules for new gas garden tools start in 2024, but the choice between battery, gas and corded tools also comes down to how each power type handles safety, maintenance and everyday operation.

What California’s small off-road engine rules mean for gas equipment

According to the California Air Resources Board (CARB), small off-road engines (SORE) are spark-ignition engines rated at or below 19 kilowatts, and as of 2021, 61% of California SORE were used in residential lawn and garden equipment. CARB’s fact sheet states that total smog-forming emissions from SORE already exceed emissions from light-duty passenger cars in California, and by 2031 SORE emissions are projected to be nearly twice those from passenger cars.

In December 2021, CARB approved updated regulations requiring most new small off-road engines to be zero emission starting with model year 2024. The amended regulation, an update to rules first adopted in 1990, applies to manufacturers and affects new equipment only. CARB notes that Californians can continue to operate their current CARB-compliant gasoline-powered SORE equipment, and there is no ban on using older models or purchasing used gas equipment in the future. Older models on store shelves can also be purchased even if they are gasoline-powered.

The zero-emission standards take effect in two phases. For model year 2024 and later, emission standards will be zero for engines used in all equipment types produced for sale in California, except generators and large pressure washers. Emission standards for generators and large pressure washers will be more stringent than existing standards by 40 to 90 percent starting in model year 2024, but not zero. In the second phase, starting in model year 2028, the emission standards for generators and large pressure washers will also be zero.

CARB says zero-emission equipment in the SORE sector is widely available, quieter, cleaner, has less vibration, and has greatly improved over the last few years. CARB also points small landscaping businesses in California to its Clean Off-Road Equipment Voucher Incentive Project (CORE), which helps them purchase zero-emission small off-road equipment, including leaf blowers, lawn mowers and string trimmers.

Safety and operation: what the manuals say

Operator manuals for gas and battery tools highlight fundamentally different safety routines. A Craftsman gasoline backpack blower manual warns that the machine is equipped with a two-stroke engine and must always be run using a mixture of gasoline and two-stroke engine oil. It states that when mixing small amounts of fuel, even small inaccuracies can drastically affect the ratio of the mixture. The manual also warns that engine exhaust fumes contain carbon monoxide and that the machine should never be started indoors or anywhere that is poorly ventilated. Fueling precautions include always ensuring adequate ventilation when handling fuel, and the operator must move the machine away from the refueling area before starting. The safety distance given is 15 meters (50 feet).

By contrast, the Greenworks 82V chainsaw operator manual covers battery tool use and care in detail. It instructs users to recharge only with the charger specified by the manufacturer, and to use power tools only with specifically designated battery packs. The manual warns that under abusive conditions, liquid may be ejected from the battery, and if contact accidentally occurs, the user should flush with water and seek medical help if liquid contacts eyes. It also states that damaged or modified batteries may exhibit unpredictable behavior resulting in fire, explosion or risk of injury, and that a battery pack or tool should not be exposed to fire or excessive temperature. Exposure to fire or temperature above 130°C may cause explosion. The manual instructs users to remove the battery pack before maintenance, before clearing jammed material, and when moving the machine.

The same Greenworks manual includes electrical safety warnings that apply to corded power tools as well. It states that power tool plugs must match the outlet and should never be modified. When operating a power tool outdoors, the manual says to use an extension cord suitable for outdoor use. It also advises that if operating a power tool in a damp location is unavoidable, the user should use a residual current device (RCD) protected supply.

Maintenance differences across power types

The University of Illinois Extension’s mower maintenance guidance describes several tasks that apply directly to gas engines. It says to check the oil level while the engine is still cold using the mower’s dipstick, and for most residential lawnmowers, oil is typically changed every year. For those who heavily use their mowing equipment, the Extension recommends changing the oil according to the number of hours specified by the manufacturer.

Air filters keep dust from entering the engine and will need to be changed per the manufacturer’s direction, at least once per year. Fuel filters are typically changed on an annual basis. Spark plugs, the Extension notes, are typically changed every two years. The owner’s manual should have detailed instructions on the type and method for replacement, including the spark plug gap measurement. The guide also warns to avoid cross-threading when installing a spark plug and to make the final tightening using a spark plug socket wrench.

For blade sharpening, the Extension’s advice applies regardless of power type but includes a key safety distinction. Before removing the blades, the user should disconnect the spark plug for gas mowers or remove the battery for electric mowers to prevent any accidental engagement of the blades. The same precaution is repeated for cleaning: whenever your hand goes near the blades, always disconnect the spark plug for gas-powered or remove the battery for electric mowers. The Extension recommends using a leaf blower or air compressor to blow off clippings, dust and debris, and lifting the engine cover to blow off dust and clippings that have accumulated around the engine and battery, being careful of wiring and hoses.

Comparing power types at a glance

Power type Key points from the manuals and CARB Notes
Gas (two-stroke) Craftsman manual: requires gasoline and two-stroke oil mixture; exhaust contains carbon monoxide; must refuel with ventilation and move machine away before starting; safety distance 15 m (50 ft). CARB: new gas SORE for most equipment types must be zero-emission from model year 2024 in California. Ongoing fuel mixing and filter/spark plug maintenance; older gas models can still be used and purchased in California.
Battery (cordless) Greenworks manual: use only specified charger and battery pack; remove battery before maintenance, clearing jams, or moving machine; damaged batteries can cause fire or explosion; do not expose to temperatures above 130°C. CARB: zero-emission equipment is quieter, cleaner, has less vibration. No fuel mixing or exhaust fumes; battery care and charging discipline required.
Corded (electric) Greenworks manual: plug must match outlet, never modify plug; use outdoor-rated extension cord outdoors; use RCD-protected supply in damp locations; avoid body contact with grounded surfaces. No fuel or battery pack to manage; cord care and electrical safety are central.

How to choose and use each type safely

If you are buying new gas equipment in California, CARB’s updated regulations mean that most newly manufactured gas-powered lawn and garden tools will be zero-emission starting with model year 2024, so battery and corded alternatives become the primary new-equipment options. Outside California, or when buying used gas equipment, the choice still comes down to how you handle fuel, maintenance and the work area. The Craftsman manual emphasizes that a blower is a dangerous tool if used carelessly or incorrectly, and that the harness must always be worn when working with the machine. It also warns to watch out for thrown objects and to always wear eye protection.

For battery tools, the Greenworks manual stresses that the battery pack should not be installed until all parts are assembled, and that the machine should be stopped and the motor allowed to stop before installing or removing the battery pack. It also instructs users to keep hands clear of the lock-out button when moving the machine. If a battery pack cracks or breaks, with or without leaks, the manual says not to recharge it, not to use it, and not to try to repair it. The terminals should be covered with heavy-duty adhesive tape and the pack discarded and replaced.

Corded electric tools eliminate fuel and battery concerns but introduce cord safety rules. The Greenworks manual’s general power tool warnings state that cords should never be used for carrying, pulling or unplugging the tool, and should be kept away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.

For all power types, the Illinois Extension’s guidance on mower cleaning and blade care applies broadly. Cleaning grass clippings from the deck prevents rust and extends equipment life. When reinstalling a blade, the Extension says to use a torque wrench to tighten the bolt to the specifications in the user manual. An unbalanced blade can create a wobble that causes strain and may result in an uneven cut.

If you are building out a set of yard tools, understanding the battery platform you will rely on is as important as the tool itself. Our guide to choosing a battery platform for yard tools walks through voltage, compatibility and long-term considerations. For gas-powered equipment that you already own, seasonal upkeep keeps engines running reliably; see our lawn mower maintenance checklist and the broader yard tool maintenance guide for cleaning, sharpening and storage routines. If you are comparing specific tool categories, our articles on leaf blowers and cleanup, lawn mowers and string trimmers and edgers explain the features that matter most within each type.

Frequently asked questions

Can I still use my old gas mower or leaf blower in California?

Yes. CARB states that the updated regulations apply to manufacturers and new equipment only. Californians can continue to operate their current CARB-compliant gasoline-powered SORE equipment, and older models on store shelves can still be purchased even if they are gasoline-powered. There is no ban on using older models or used equipment purchased in the future.

Do battery garden tools require less maintenance than gas tools?

Battery tools eliminate the fuel mixing, oil changes, air filter replacements, fuel filter changes and spark plug inspections that the University of Illinois Extension and gas tool manuals describe for gas engines. However, battery tools still require blade sharpening, cleaning, and careful battery handling. The Greenworks manual outlines specific battery care rules, including using only the specified charger, avoiding temperature extremes, and inspecting packs for damage.

What extra safety steps do corded electric tools need?

The Greenworks power tool warnings state that when operating outdoors, you should use an extension cord suitable for outdoor use. In damp locations, use a residual current device (RCD) protected supply. Cords must be kept away from heat, oil, sharp edges and moving parts, and should never be used for carrying or pulling the tool.

Ready to explore more? Browse all our garden tool guides to compare types, power sources and features for your yard.

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