Corded vs Battery String Trimmer: How to Choose for Your Yard

The corded vs battery string trimmer choice comes down to one distance: how far your work sits from an outlet. Pick corded when every edge is within one extension cord of power, and pick battery when it is not, then check weight and run time before you buy.

I trim the edges of a house lawn and long grass strips under orchard trees, so I think about outlets before I think about motors. Below I compare reach, run time, power, weight, noise, safety and care, and finish with a pick by yard.

Corded vs Battery String Trimmer by Yard Type

A corded trimmer suits a small yard with outlets close to the work, and a battery trimmer suits any yard where a cord would not reach or would catch on things. Weight, run time and upkeep follow from that first split. The same split applies to hedge work, which I compare in my corded and battery hedge trimmer guide.

A corded electric trimmer plugs into 120 V household power, so it never runs down. A battery trimmer carries its power in a pack, so it goes anywhere, but each pack lasts only as long as the maker’s run time before it needs a charger. My guide on what a string trimmer is names the parts and power types both of these share.

• Choose corded if every edge sits within one extension cord of an outlet, you trim a few times a month and you want nothing to charge.
• Choose battery if the work crosses a fence, a drive or a row of trees, or you want to start without unrolling a cord.
• Choose neither for heavy brush. Saplings and thick stems call for a gas brush cutter, run outdoors only, with the blade and guard its manual lists. My guide to string trimmers and brush cutters shows where the line stops and the blade begins.

How Each Type Gets Its Power

The two types differ in where the energy comes from, and that decides what you buy and carry.

How a Corded String Trimmer Works

A corded electric string trimmer runs on household power through an extension cord. According to BLACK+DECKER and Craftsman, the extension cord goes into the handle and locks into a built-in cord retainer: double the cord about 8 inches from its end, slot it in and hook the loop over the tab.

The extension cord is usually yours to buy. Craftsman sells its CMEST900 without a cord, and BLACK+DECKER lists no cord in the box for its BESTE620 and BEST935. Read the manual for the cord rating, gauge and length it asks for before you buy one. The corded string trimmers I recommend are worth a look if a cord and an outlet suit your yard.

How a Battery String Trimmer Works

A cordless string trimmer carries a lithium-ion pack on the tool and charges it on a separate charger. Makers print voltage two ways. BLACK+DECKER’s manual says its 20V MAX pack has a nominal voltage of 18 volts, so compare pack labels inside one brand and never across brands.

Charge time and run time are two numbers. According to Greenworks, its 12-inch 40V trimmer with a 2 Ah battery runs up to 30 minutes, and the charger takes 60 minutes. My comparison of 20V and 40V string trimmers looks at differences in swath, line, weight and batteries.

Reach and Run Time

Reach is the corded limit and run time is the battery limit, so each type runs out of room in a different place.

How Far a Cord Really Reaches

A cord turns your yard into a circle around the outlet. With 50 feet of reach, the circle covers about 7,850 square feet, or 0.18 acre. With 100 feet it covers about 31,400 square feet, or 0.72 acre, and an acre is 43,560 square feet. For a yard that fits inside that circle, my picks of small yard string trimmers are easy to handle.

Real reach is shorter, because the cord has to go around the corner of a shed, the edge of a drive and the trunk of every tree, and it has to stay behind you and clear of the line. Count the cord you can lay clear of the cutting path, not the length printed on the reel.

On my house lawn the outlets are in the sheds, so a corded trimmer would turn every far corner into a cord-handling job. The same cord trade-off applies to pruning from the ground, and my corded or battery pole saw guide compares the two.

How Long a Battery Lasts

Run time is the maker’s figure for one pack in one set of conditions. Greenworks gives up to 30 minutes for its 12-inch 40V trimmer with the 2 Ah pack in the kit, and EGO gives up to 30 minutes for its 15-inch ST1521S with a 2.5 Ah pack. Greenworks adds that grass condition and operator technique change the result. My comparison of 40V and 56V string trimmers explains which battery platform fits which yard.

Plan the job in packs. Suppose a pack gives 30 minutes in your grass and the edging takes 50: you need a second charged pack or a wait at the charger.

A maker’s up-to figure is a ceiling, so a job near the limit may need a third. Greenworks lists a 60-minute charge for its 2101602 kit, which is the wait if you carry no spare. A spare charged pack is the usual fix for a long job. My roundup of battery string trimmers covers cordless models for every yard.

I plan an edging job by the length of the row, so I count how many packs the row needs before I start. On a plum-tree strip that ends far from the shed, I carry a second pack rather than walk back. My picks of string trimmers for edging all have a real edge mode or an edger kit.

Power and Cutting Ability

Amps and battery volts do not rank cutting strength, because they describe different parts of the tool. My guide to string trimmer cutting width matches the swath to the size of your yard.

Corded makers rate the motor in amps: 3.5 amp on the Craftsman CMEST900 and 6.5 amp on the BLACK+DECKER BESTA510. Battery makers rate the pack in volts and amp-hours. No maker converts one into the other, so neither number settles which trimmer cuts harder.

The manuals do document the limits that matter in the field. The Craftsman CMEST900 and the BLACK+DECKER corded models take only 0.065 inch round line, while the EGO ST1521S takes 0.095 inch nylon twist line. Line size is set by the head and the motor, so use only the sizes and types the manual for your exact model approves. My comparison of the BESTA510 and CMEST900 shows which corded trimmer fits which lawn.

Cutting swath overlaps too. The corded examples above cut 12 to 14 inches, and the battery examples cut 12 to 15 inches.

Along the fence line and the ditch bank I cut tall growth in layers, because a head wrapped in a mat of grass bogs the motor down on either type. My roundup of string trimmers for tall grass covers models tested on overgrown ground.

Weight and Handling

Weight is where the two types swap places, depending on whether you count the battery.

The corded examples weigh 5.35 and 6.5 pounds, and the battery examples weigh 7.87 and 9.0 pounds with the pack fitted. These corded examples are lighter than these battery examples with the pack fitted. The cord adds no weight to the tool itself, but it drags on the ground and pulls at the handle. My list of lightweight string trimmers compares seven models by their stated weight.

On a long edge I notice the cord drag before I notice the weight of a pack, because the drag pulls the head off the line I am following. BLACK+DECKER lists an adjustable shaft on both its corded BESTA510 and its battery LSTE523, so set the length before the first pass.

Noise, Vibration and Fumes

Both types run on an electric motor, so neither makes exhaust. If gas is also on your list, my guide to battery and gas string trimmers sets the two side by side.

NIOSH sampled 80 landscaping workers and found significantly more noise and carbon monoxide exposure with fuel-powered string trimmers than with battery versions (1). That study compared fuel with battery, so it does not show whether a corded or a battery trimmer is quieter.

Wear hearing protection anyway. Craftsman states that noise from its trimmer may contribute to hearing loss under some conditions of use.

A small laboratory test with two participants measured gloved hand vibration of 3.5 to 5.8 m/s2 on a grass trimmer, against 1.1 to 2.0 on a backpack blower, and gloves reduced it (2). It did not compare corded with battery trimmers. I wear gloves and stop for a break on a long edge, and I hold the tool the way its manual shows.

Safety With Cords and With Batteries

The rules for both types start with the same protection and then split at the power source.

Rules That Apply to Both

Wear eye protection marked ANSI Z87.1, hearing protection, long pants and sturdy boots every time. An estimated 81,907 lawn trimmer injuries were treated in US emergency departments from 2000 to 2009, and the eye accounted for 42.5 percent of them (3). Most were caused by foreign objects.

Keep bystanders and pets away by the distance in your manual. Greenworks gives 50 feet (15 m) for its 2101602 trimmer, and EGO gives at least 100 feet (30.5 m) in the manual for the ST1520S tool inside the ST1521S kit. The corded BLACK+DECKER BESTA510 and Craftsman CMEST900 manuals give 100 feet (30 m) in their edging warnings.

Where a manual prints two distances, keep the longer one. The guard stays on at all times.

Rules for Corded Trimmers

The cord adds shock and trip risks, and the makers spell out how to manage them.

• Use an outdoor extension cord. Greenworks and BLACK+DECKER ask for a cord rated for outdoor use, marked W or W-A on the jacket, with a polarized plug.
• Match the cord to the tool. Greenworks says an undersized cord drops voltage, loses power and overheats, so use the next heavier gauge when in doubt. A smaller gauge number means a heavier cord.
• Plug into a GFCI-protected outlet. BLACK+DECKER, Craftsman and Greenworks advise ground fault protection on the circuit.
• Keep the cord behind you and clear of the line. Check the cord before each use, replace a damaged one, and never carry the tool by the cord or yank the plug out.
• Stay out of rain and damp. The manuals say no use in wet conditions, and BLACK+DECKER adds that a wet BESTA510 must dry at least 48 hours.

Rules for Battery Trimmers

The battery adds charging and heat risks, and the pack stays live until you remove it.

• Use the maker’s charger and pack. EGO, Bosch, Milwaukee and Craftsman all say to charge only with the charger they specify.
• Charge and store the pack inside the ranges your maker gives. Greenworks allows charging between 45 and 104 F for its 2101602 kit. EGO’s 32 to 104 F is the operating range of its ST1610T trimmer, not a charging range, and EGO says to keep the pack away from any temperature above 265 F.
• Retire a damaged pack. EGO warns that a damaged or modified pack may behave unpredictably, with fire, explosion or injury, and says to keep a loose pack away from coins, keys and nails.
• Treat the tool as live. EGO says battery machines are always in operating condition until the pack is out, so you switch off, wait for the head to stop and take the pack out before you clear grass or change line.
• Stay out of rain. EGO tells you not to operate its trimmer in rain or wet conditions.

I switch off, let the head stop and take the pack out before I walk the tool back to the shed, so nothing can start in my hands.

Care, Cold Weather and Storage

A corded trimmer asks little between jobs, and a battery trimmer asks you to look after the pack.

Looking After a Corded Trimmer

Check the cord and plug before each use and replace a damaged cord. BLACK+DECKER says to blow dirt out of the air vents with clean dry air at least once a week and to store the tool indoors, dry and out of children’s reach. Its warranty on the BESTA510 runs two years, and Craftsman gives three years on the CMEST900.

Looking After a Battery Pack

Cold costs capacity. Laboratory work on lithium-ion cells found substantially reduced energy and power at low temperatures (4), and EGO gives 32 to 104 F as the operating range for its ST1610T trimmer and minus 4 to 158 F as the storage range. A shed in winter can sit inside the storage range and below the operating one. Charge only inside the range in your battery’s manual.

On frost mornings I keep the pack indoors until I am ready to start. Storage charge matters too: researchers who stored lithium-ion cells at different charge levels recommend avoiding a high charge during storage (5). That work used laboratory cells, not tool packs, so follow your maker’s storage steps first and store the pack dry, off the tool, as EGO says.

Warranties differ by model. Greenworks lists three years on the tool and the battery of its 12-inch 40V trimmer, and EGO lists five years on the ST1521S tool and three years on its battery.

Which Type Suits Which Yard

Pick between a cordless vs corded string trimmer by the distance, the length of the job and the ground you cover. The table adds the cases the first section leaves out. My guide on what size trimmer you need matches swath, power and weight to your yard.

Around the house I reach for a corded model when an outlet is near the edge. In the orchard strips and along the ditch bank I want a battery, because the nearest outlet is in a shed. If you want a dedicated tool for edging near an outlet, my list of corded lawn edgers I ranked compares five plug-in options.

Pick the Trimmer You Will Actually Use

Remember three things: a cord limits reach, a pack limits run time, and the line limit in the manual sets what you can cut. Before you buy, walk your longest edge and count the distance to the nearest outlet; if a cord would snag or run short, choose battery. Then read the model’s manual for line size, safe distance and charging range. With those numbers in hand, the corded vs battery string trimmer question answers itself for your yard. My best string trimmer roundup applies these checks to specific models.

Frequently Asked Questions

What is corded and cordless?

Corded and cordless describe how a string trimmer gets its power. A corded trimmer plugs into a household outlet through an extension cord, and a cordless trimmer runs on a rechargeable battery pack. The corded type has no run-time limit but limited reach, and the cordless type goes anywhere but runs for a limited time per charge.

What is a cord trimmer?

A cord trimmer is a string trimmer that runs on 120 V household power through a power cord and an outdoor extension cord. It has no battery, so it never runs down, but the cord limits where you can work. Switch it off, wait for the head to stop and unplug it before you clear the head or change line.

Are corded trimmers better to use than cordless ones?

Corded trimmers are better to use when the work stays near an outlet, because they carry no pack and never run out of power. Cordless trimmers are better when the work is far from an outlet or crosses obstacles that would catch a cord. Amps and volts do not rank cutting strength, so choose by reach.

Are battery powered line trimmers any good?

Battery powered line trimmers do the job on lawn edges and light weeds when one charge, or a spare pack, covers the work. Makers state run times such as up to 30 minutes per pack on the Greenworks 12-inch and EGO 15-inch models. For thick growth or a large area, check the model’s line limit and count the packs you need.

What is the best battery powered string trimmer?

The best battery powered string trimmer is the one whose pack gives enough run time for your longest job at a weight you can carry. Compare the maker’s run time and charge time, the cutting swath, the line size the head allows and the other tools on the same battery. Use voltage labels only within one brand.

References

1. Alexander BM, Graydon PS, Pena M, Feng HA, Beamer BR. Hazardous exposures and engineering controls in the landscaping services industry. Journal of Occupational and Environmental Hygiene. 2025;22(3):189-202.
2. Oh J, Chen N, Boyd C. Laboratory evaluation of occupational exposure to hand-arm vibration (HAV) during grounds maintenance equipment operations. Ann Agric Environ Med. 2023;30(2):384-389.
3. Leinert J, Griffin R, Blackburn J, McGwin G. The epidemiology of lawn trimmer injuries in the United States: 2000-2009. J Safety Res. 2012;43(2):137-139. doi:10.1016/j.jsr.2012.03.001
4. Ji Y, Zhang Y, Wang C-Y. Li-Ion Cell Operation at Low Temperatures. J Electrochem Soc. 2013;160(4):A636-A649.
5. Keil P, Schuster SF, Wilhelm J, et al. Calendar Aging of Lithium-Ion Batteries. J Electrochem Soc. 2016;163(9):A1872-A1880.

Safety Note: Read your manual first. A string trimmer or brush cutter throws debris with force, so clear stones, glass and wire from the area before you cut. Wear impact-rated eye protection with side coverage that meets ANSI Z87.1, hearing protection, gloves, heavy long pants, long sleeves and sturdy slip-resistant boots (steel-toe where your manual says so). Keep people and pets at least as far away as your manual says (50 feet in some manuals, 100 feet in others), and stop if anyone comes closer. Keep the correct guard fitted, use only the cutting attachments, handles and harness the maker approves for your exact tool, and never replace trimmer line with wire. A blade can kick sideways when it hits a stump or a thick stem, so fit the handlebar and harness your manual requires for blade work, hold both handles firmly and keep secure footing. Before you clear a jam, clean the tool or change line, a blade or an attachment, switch it off, wait for all movement to stop, then remove the battery, unplug the cord or disconnect the spark plug wire. Refuel a gas model outdoors with the engine off and cool, away from flames or sparks, and move away from the fueling spot before starting, as far as your manual says (often 10 to 30 feet); never run it in a garage, shed or other closed space. For a battery model, use only the maker’s battery and charger, charge it within the temperature range in your manual and never use a damaged or swollen pack. For a corded model, use a GFCI outlet, keep the cord clear of the cutting line and avoid wet conditions.