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Finding the best cordless string trimmer starts with comparing the specs that matter: cutting width, speed, line feed, battery capacity, and whether the head also works as an edger. The five picks below cover different priorities, from a folding shaft for tight storage to a 15-inch cutting swath for bigger lawns.
We selected these models by reviewing the features and specifications in their product listings. We have not tested any of them. Use this guide as a starting point, and check the current product listing for the latest price, availability, and any details that may have changed.
Our Picks at a Glance
We compared the listed specs and features of these five cordless string trimmers to group them by what they do best. None of these picks have been tested by us. Because prices and ratings change, check each listing for current details.
The Five Picks in More Detail
BLACK+DECKER 20V String Trimmer and Edger: Best for lightweight trimming and edging
The BLACK+DECKER LST300 is a 20V cordless trimmer with a 12-inch cutting width and a listed speed of 6200 RPM. Its POWERDRIVE transmission is designed to send more power to the cutting string, and the automatic feed spool lets out line without bumping. The listing says the trimmer is quiet, easy to start, and has reduced vibration.
The head converts from trimming to edging in seconds, and the handle has adjustable positions for height and angle. The kit includes one 2.0 Ah lithium-ion battery and a charger. The listed item weight is 5.7 pounds.
Specs that matter: Power source: battery. Cutting width: 12 inches. Speed: 6200 RPM. Battery: one 2.0 Ah lithium-ion included. Item weight: 5.7 pounds. Model: LST300.
Best for: Routine trimming and edging around flower beds, fences, and walkways with automatic line feed.
Greenworks 40V String Trimmer and 390 CFM Blower Combo: Best for trimming plus blowing in one kit
This Greenworks combo includes a 40V string trimmer with a 12-inch cutting width and a 390 CFM blower that reaches 110 MPH. The trimmer uses 0.065-inch auto-feed line, and the listing includes a 3-year head warranty. The same 2.0 Ah battery powers the trimmer and the blower, and the listing says it charges in 60 minutes and works across more than eight tools in the 40V ecosystem.
The blower has cruise control for steady air flow and a listed 67 dB sound level, which the listing describes as whisper start. The combo is listed at 16.5 pounds. Speed for the trimmer is not listed.
Specs that matter: Power source: battery. Cutting width: 12 inches. Blower: 390 CFM, 110 MPH. Battery: 2.0 Ah, 60-minute listed charge time. Trimmer speed: not listed. Item weight: 16.5 pounds.
Best for: Clearing overgrown edges and then blowing clippings off walkways and driveways with one battery platform.
Heywork 20V Cordless String Trimmer and Edger: Best for long runtime and extra line
The Heywork G-DC2505-HY cordless trimmer cuts a 12-inch swath at a listed 8000 RPM and switches between trimming and edging modes. Its automatic line feed system releases new line when the line wears short, so there is no need to tap or bump the spool. The listing says the trimmer weighs 6.3 pounds and has an adjustable grip.
The kit includes two 20V 4.0 Ah lithium-ion batteries, a charger, and eight pre-wound replacement spools. That makes it a strong choice for longer sessions where spare line and extra batteries are useful.
Specs that matter: Power source: battery. Cutting width: 12 inches. Speed: 8000 RPM. Batteries: two 4.0 Ah lithium-ion included. Extra spools: 8 pre-wound. Item weight: 6.3 pounds. Model: G-DC2505-HY.
Best for: Larger trimming jobs where extra battery capacity and spare line lower the number of stops.
KOMASTY 20V Cordless String Trimmer: Best for compact storage and tight spaces
The KOMASTY trimmer is designed for small yards and crowded storage areas. Its shaft folds 180 degrees in three ways for vertical storage, and the head adjusts 90 degrees while the handle rotates 180 degrees. That lets it reach slopes, under-benches, and corners without moving the whole trimmer around.
It cuts a 12-inch swath with a listed 9500 RPM motor and has a 2-in-1 pivoting head for trimming and edging. The kit includes two 2.0 Ah batteries and a charger, with a listed total runtime of 30 minutes across both batteries. The automatic line feed releases line without manual bumping.
Specs that matter: Power source: battery. Cutting width: 12 inches. Speed: 9500 RPM. Batteries: two 2.0 Ah included. Listed total runtime: 30 minutes. Product dimensions: 40″L x 8″W.
Best for: Apartments, small garages, and anyone who needs a trimmer that stores out of the way.
EGO POWER+ 15-Inch String Trimmer: Best for wide cutting swath and brushless power
The EGO POWER+ ST1502SA stands out for its 15-inch cutting swath and 0.095-inch professional-grade line. A high-efficiency brushless motor is listed as delivering low vibration, increased reliability, and a long lifespan. The Rapid Reload head lets you load new cutting line quickly, and variable speed control lets you match the pace to the job.
The included 2.5 Ah battery is listed for up to 45 minutes of runtime on a single charge, and the CH2100 charger restores it in 50 minutes. The listed speed is 5800 RPM and the item weight is 7.4 pounds.
Specs that matter: Power source: battery. Cutting width: 15 inches. Line size: 0.095 inch. Speed: 5800 RPM. Battery: 2.5 Ah included; up to 45 minutes listed; 50-minute listed charge time. Item weight: 7.4 pounds. Model: ST1502SA.
Best for: Bigger lawns where a wider swath and longer single-charge runtime save time.
How to Choose
When comparing cordless string trimmers, the listings give you the basics: cutting width, motor speed, battery type, and included accessories. Use the table below and the notes that follow to decide which specs matter for your yard. For anything not listed on a product, check that product’s current listing. For more general yard upkeep ideas, see the outdoor home essentials checklist.
Cutting Width
A wider cutting width covers more ground with each pass, which can shorten the time on large lawns. The EGO ST1502SA lists a 15-inch swath, while the BLACK+DECKER, Greenworks, Heywork, and KOMASTY models each list a 12-inch width.
Motor Speed
Speed is listed in RPM and gives an idea of how fast the string spins. In this group, the KOMASTY lists the highest speed at 9500 RPM, followed by the Heywork at 8000 RPM, BLACK+DECKER at 6200 RPM, and EGO at 5800 RPM. Greenworks does not list a speed. Higher RPM can help power through thicker grass, but battery drain and line durability also matter.
Battery and Runtime
Included batteries vary widely. BLACK+DECKER and Greenworks each include one 2.0 Ah battery, KOMASTY includes two 2.0 Ah batteries with a listed total runtime of 30 minutes, Heywork includes two 4.0 Ah batteries, and EGO includes one 2.5 Ah battery with up to 45 minutes listed. The Heywork and KOMASTY kits double up on batteries so you can swap when one runs low.
Charging times are only listed for the Greenworks (60 minutes) and EGO (50 minutes). For the other models, charging time is not listed, so check the product page.
Line Feed System
Most trimmers in this group use automatic line feed, which releases new string when the line shortens: BLACK+DECKER, Greenworks, Heywork, and KOMASTY all describe auto-feed systems. The EGO uses a Rapid Reload head that lets you load new line quickly instead of bumping the spool. If you do not want to tap the trimmer head, look for an auto-feed model.
Trimmer, Edger, and Storage Features
Three picks convert from trimming to edging: the BLACK+DECKER 2-in-1, the Heywork, and the KOMASTY. The KOMASTY also folds its shaft for vertical storage, which saves space in tight areas. For more ways to keep tools and gear tucked away, check our organization and storage product guide. The Greenworks combo adds a blower rather than an edging feature. The EGO is a straight trimmer with no edging mode in the listed data.
| Product | Cutting Width | Speed | Battery Kit | Notable Feature |
|---|---|---|---|---|
| BLACK+DECKER LST300 | 12 inches | 6200 RPM | One 2.0 Ah battery | 2-in-1 trimmer/edger, auto-feed spool |
| Greenworks 40V Combo | 12 inches | Not listed | One 2.0 Ah battery | Trimmer plus 390 CFM blower |
| Heywork G-DC2505-HY | 12 inches | 8000 RPM | Two 4.0 Ah batteries | Eight pre-wound spools included |
| KOMASTY | 12 inches | 9500 RPM | Two 2.0 Ah batteries | Folding shaft for storage |
| EGO POWER+ ST1502SA | 15 inches | 5800 RPM | One 2.5 Ah battery | Rapid Reload head, brushless motor |
FAQ
What does cutting width mean on a cordless string trimmer?
Cutting width is the swath of grass the trimmer line clears in one pass. The picks here list either 12 inches or 15 inches. A wider swath like the EGO’s 15 inches covers more ground per pass, while 12-inch models are more common in this group.
How do automatic line feed trimmers work?
Automatic feed systems on the BLACK+DECKER, Greenworks, Heywork, and KOMASTY release new line when the current line gets short, so you do not need to bump the head. The EGO uses a Rapid Reload head for quick manual line changes instead.
How long do the batteries last?
Battery runtime is only listed for a few of these picks. The KOMASTY lists 30 minutes total across two 2.0 Ah batteries, and the EGO lists up to 45 minutes on one 2.5 Ah charge. The Heywork ships with two 4.0 Ah batteries but does not list a runtime, so check the listing for expected run times.
Can these trimmers edge lawns too?
The BLACK+DECKER, Heywork, and KOMASTY each list a 2-in-1 design that converts between trimming and edging. The Greenworks combo and the EGO trimmer do not list an edging mode.
Before you buy the best cordless string trimmer for your yard, confirm the current price, included accessories, and any updated specs on the product page. If you are also outfitting basic home tools, check the home essentials checklist for other useful gear.
About Caleb Morgan
Caleb Morgan is part of our editorial team and reviews and edits our holiday shopping calendar guides, checking product details against manufacturer specifications and owner feedback.
