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A 40V cordless string trimmer can be the sweet spot for homeowners who want more power than a sub-20V tool but without the weight and noise of gas. In real yards that means faster cutting through thicker grass, better edging control, and longer runtimes for medium to large properties. You want a trimmer that starts easily, balances well on the shoulder or hip, and delivers consistent line feed for tidy edges. This guide covers six shortlisted 40V cordless string trimmers that represent the most practical choices for typical suburban and rural yards. We evaluated each option on the performance and handling features that matter most to gardeners and property owners. Read on to see the criteria we used and the factors to weigh when choosing the right 40V trimmer for your landscape needs.
Top Picks at a Glance
| Best Quality Built to a higher standard if you want something more solid | SKIL PWR CORE 40 Brushless 16-Inch Cordless Multi-Head String Trimmer Kit (4.0Ah Battery) |  |
| Best Value The sweet spot between price and what you get | Greenworks 40V 15" Cordless String Trimmer with 2.5 Ah Battery and Charger |  |
| Best Budget The cheapest option that still gets the job done reliably | LiTHELi 40V Cordless 13" String Trimmer with Wheeled Edger and 2.0Ah Battery |  |
| Highest Rated A top-rated pick with lots of positive feedback | Makita GRU01Z 40V Max XGT Brushless 15" Cordless String Trimmer (Tool Only) |  |
| Most Popular A crowd favorite that many people choose with confidence | Greenworks G-MAX 40V 12" Cordless String Trimmer and 390 CFM Blower Combo (2.0Ah) |  |
| Best Seller A high-volume bestseller chosen again and again | BLACK+DECKER 40V MAX 13 in Cordless String Trimmer and Edger (LST136) with Battery and Charger |  |
SKIL PWR CORE 40 Brushless 16-Inch Cordless Multi-Head String Trimmer Kit (4.0Ah Battery)
| Power Source | Battery Powered |
|---|---|
| Cutting width | 16 inches |
| Speed | 6000 rpm |
| Number of Batteries | 1 Lithium Ion (included) |
The SKIL PWR CORE 40 brushless trimmer is designed for homeowners who want near-professional cutting performance without gas. Its digital brushless motor and two-speed selector give strong, efficient power for tackling tall grass and thick weeds while preserving battery life. The kit includes a 4.0Ah PWR CORE battery and Auto PWR JUMP charger for faster recharge and longer runtime than typical 40V batteries, and the dual-line bump feed plus twist-load head make line changes quick and frustration-free. The power head is attachment-ready, so you can expand to other yard tools on the same battery platform. Practical limitations are that this is a one-battery kit so very large properties may need a spare battery for uninterrupted work, and while the 16-inch swath is efficient for most lawns it is narrower than some commercial trimmers. For performance-minded buyers who prefer cordless convenience and modular tool systems, this trimmer balances power, runtime, and easy maintenance.
Best for: Buyers who prioritize cutting performance and runtime in a cordless trimmer and who want a modular 40V platform they can expand with other attachments.
Less Ideal for: Large acreage owners who need long continuous runtime out of the box or commercial users who require wider cutting swaths and heavier-duty commercial equipment.
- Brushless digital motor for efficient, higher-performance cutting and longer tool life
- Includes 4.0Ah PWR CORE battery and fast Auto PWR JUMP charging for improved runtime
- Dual-line bump feed and twist-load head for fast, tool-free line replacement
- Attachment-ready power head lets you swap on other SKIL 40V tools for broader yard work
- Kit includes a single battery so continuous work on large properties may require buying an extra battery
- 16-inch cutting width is narrower than some professional-grade trimmers
Verdict: A high-performance 40V brushless trimmer that delivers strong cordless cutting and fast charging on a modular battery platform.
Greenworks 40V 15" Cordless String Trimmer with 2.5 Ah Battery and Charger
| Power Source | Battery Powered |
|---|---|
| Cutting width | 15 inches |
| Number of Batteries | 1 Lithium Ion (included) |
This Greenworks 40V 15" cordless string trimmer is a practical, no-frills tool for routine yard maintenance on small to mid-size properties. It uses a dual-line .080" bump-feed head for quick line advancement and a TORQDRIVE motor that boosts torque for cutting through thicker grass and common weeds. The variable speed trigger lets you dial power to the task to conserve battery on light trimming or push harder when tackling dense patches. It ships with a 2.5 Ah battery and charger so you can start work right away and the manufacturer positions it for yards up to about a half acre. Notable benefits are the wider 15" swath for fewer passes and the included battery which avoids an additional purchase. Limitations are typical of compact cordless units: run time on the 2.5 Ah pack will be modest under heavy load and it is intended for residential rather than professional daily use. Users should also observe standard safety gear recommendations because of flying debris.
Best for: Homeowners who want a dependable, ready-to-use 40V trimmer for routine lawn edge work and clearing weeds on small to medium yards and who prioritize straightforward performance and included battery value.
Less Ideal for: Landscape professionals or owners of large properties who need long continuous run time or heavy-duty commercial performance should consider higher-capacity battery platforms or gas-powered options.
- 15-inch cutting width covers more ground per pass for faster trimming
- TORQDRIVE motor provides increased torque for cutting thicker grass and weeds
- Variable speed trigger allows finer control to conserve battery or increase power
- Includes a 2.5 Ah battery and charger so the tool is ready to use out of the box
- 2.5 Ah battery may deliver limited runtime under heavy use
- Designed for residential yards up to 1/2 acre and not for professional continuous use
Verdict: A practical 40V cordless trimmer that delivers a wider 15" cutting path, stronger torque, and comes ready to use with a battery and charger, making it a solid choice for routine residential trimming.
LiTHELi 40V Cordless 13" String Trimmer with Wheeled Edger and 2.0Ah Battery
| Power Source | Battery Powered |
|---|---|
| Cutting width | 13 inches |
| Speed | 8500 rpm |
| Battery Capacity | 2.0Ah |
The LiTHELi 40V cordless string trimmer is a budget-oriented 2-in-1 tool that works as both a handheld trimmer and a wheeled edger. It uses a 40V brushless motor with a variable-speed trigger up to 8500 rpm and a 13-inch cutting swath to handle routine border trimming and tidy-up work around beds and walkways. The head swivels 90 degrees to convert to an edger, and the automatic line feed saves fiddling with bump-feed systems. A telescopic, foldable shaft and an adjustable auxiliary handle make it easy to match user height and to store in tight spaces. The included 2.0Ah battery and charger make this ready to use out of the box, and the flower guard protects plants during close work. Expect this to handle light-to-moderate growth and short grasses well, while very heavy or overgrown areas will require multiple passes or a more powerful commercial unit. Build quality and battery runtime are appropriate for the price but will not match premium brands.
Best for: Buyers looking for an affordable, ready-to-use cordless trimmer that handles routine edging and light-to-moderate trimming around small to medium yards.
Less Ideal for: Property owners with large lawns, dense weeds, or frequent heavy-duty trimming needs who should consider higher-capacity batteries or professional-grade models.
- 2-in-1 design converts quickly between trimmer and wheeled edger for greater versatility
- Automatic line feed reduces downtime and eliminates frequent bumping
- Telescopic, foldable shaft and adjustable handle improve user comfort and storage
- Includes 2.0Ah battery and charger so it is ready to use out of the box
- 2.0Ah battery provides limited runtime for larger yards or dense vegetation
- Not intended for heavy-duty or overgrown brush where a higher-power commercial trimmer is needed
Verdict: A cost-conscious 40V cordless trimmer that gives good versatility for routine edging and light trimming with the convenience of an included battery and charger.
Makita GRU01Z 40V Max XGT Brushless 15" Cordless String Trimmer (Tool Only)
| Power Source | Battery Powered |
|---|---|
| Cutting width | 15 inches |
| Speed | 6500 rpm |
The Makita GRU01Z is a pro-grade 40V max XGT string trimmer built to replace gas units on demanding jobs. It uses a Makita outer-rotor brushless motor and digital XGT communication to keep power high under load, while Automatic Torque Drive Technology shifts RPM between 3,500 and 6,500 to balance run time and cutting force. Typical use will be heavy trimming around fence lines, driveways, and job-site cleanup where a 15" cutting swath speeds work. The Rapid Load bump-and-feed head makes line changes quick, a reverse-rotation function clears entangled material, and IPX4 and XPT protections help resist dust and water on rough sites. As a tool-only unit it requires XGT batteries and a charger, which lets teams mix batteries across compatible gear but adds cost if you do not already own the system. Expect strong, gas-like performance and robust build quality paired with the convenience and lower noise of cordless operation.
Best for: Contractors or serious homeowners who prioritize consistent, gas-like cutting power and durable construction for frequent heavy trimming.
Less Ideal for: Casual users with only light trimming needs or first-time buyers who do not want to invest in the XGT battery platform.
- High-power outer-rotor brushless motor and digital XGT communication for sustained performance under heavy load
- Automatic Torque Drive Technology with three speed settings to match power and run time to the task
- Rapid Load bump-and-feed head and reverse rotation for fast line changes and clearing jams
- IPX4-rated construction and XPT protection for improved dust and water resistance on job sites
- Sold as tool-only so battery and charger are required and sold separately
- 15" cutting width is large but may be less maneuverable in very tight ornamental beds
Verdict: Choose the Makita GRU01Z if you need a durable, gas-replacing 40V trimmer that delivers sustained power and professional features on demanding jobs.
Greenworks G-MAX 40V 12" Cordless String Trimmer and 390 CFM Blower Combo (2.0Ah)
| Power Source | Battery Powered |
|---|---|
| Cutting width | 12 inches |
| Speed | 7500 rpm |
| Number of Batteries | 1 Lithium Ion (included) |
| Battery Average Life | 2 hours |
This Greenworks combo pairs a 12-inch, .065" auto-feed trimmer with a 390 CFM blower and a single 40V 2.0Ah battery to tackle common small-yard tasks without gas or cords. The trimmer’s auto-feed dual-line head and 7500 rpm brushless motor make edging and cutting 1-inch weeds along fences and walkways quick and predictable, while the blower’s cruise-control mode sustains high airflow to clear wet leaves from driveways and patios. Because the trimmer and blower run off the same 40V ecosystem, swapping between tasks is fast and the included battery recharges in about 60 minutes. The kit is noticeably lighter and quieter than equivalent gas tools which reduces fatigue during longer sessions and lets you work earlier in the morning. Expect shorter run times than larger battery platforms under heavy continuous loads, and very dense brush will stress the 2.0Ah pack more quickly. Overall this is a practical, low-maintenance combo for homeowners who want strong day-to-day performance in a compact, cordless package.
Best for: Homeowners with small to medium yards who prioritize strong, gas-free performance and quick switching between trimming and blowing for tidy edges and hard surfaces.
Less Ideal for: Landscapers or users who need long continuous runtime or want to tackle thick brush and heavy-duty clearing on large properties.
- Auto-feed dual-line 12" trimmer head reduces downtime for line changes and keeps cutting consistent
- Brushless motor and 7500 rpm deliver strong cutting power for typical yard weeds
- Shared 40V battery lets you switch between trimmer and blower without extra batteries
- 390 CFM blower with cruise control clears wet leaves and debris efficiently
- Lightweight and quieter than gas equivalents, reducing fatigue and neighborhood disturbance
- 2.0Ah battery provides limited continuous runtime under heavy use compared with larger-capacity packs
- Not intended for heavy brush cutting or professional-scale workloads
Verdict: A compact, performance-focused cordless trimmer and blower combo that delivers strong everyday cutting and blowing for small yards while eliminating gas and cord hassles.
BLACK+DECKER 40V MAX 13 in Cordless String Trimmer and Edger (LST136) with Battery and Charger
| Power Source | Battery Powered |
|---|---|
| Cutting width | 13 inches |
| Speed | 8500 rpm |
| Number of Batteries | 1 Lithium Ion (included) |
The BLACK+DECKER LST136 is a battery-powered 13-inch string trimmer that doubles as an edger for common yard maintenance around a typical home. It is powered by a 40V Max lithium-ion battery with a state-of-charge indicator and a fast charger so you can gauge runtime and restore power in roughly two hours. The POWERDRIVE transmission and 8500 rpm top speed give it enough punch to cut through thicker weeds, while the PowerCommand dial lets you prioritize torque or runtime depending on the job. The Automatic Feed Spool reduces interruptions by advancing line as needed without bumping. Practical touches like an adjustable telescoping shaft, soft-grip handle, and included auxiliary handle improve comfort for longer sessions. Converting to an edger is quick, making boundary cleanup easier after trimming. Limitations are typical of battery trimmers: runtime depends on battery capacity and heavy, continuous use will need recharge or a spare battery, and it is best for homeowner yards rather than commercial heavy-duty jobs.
Best for: Homeowners who want a versatile, cordless trimmer that handles routine lawn edging and light-to-medium weed cutting with user-friendly controls and easy conversion between trimmer and edger.
Less Ideal for: People who need a high-hour commercial tool or who regularly tackle very large properties where long continuous runtime and industrial power are required.
- Includes 40V Max lithium-ion battery with state-of-charge indicator and fast charger for quick turnaround
- PowerCommand dial to choose higher power or longer runtime for different yard tasks
- Automatic Feed Spool supplies line as needed without bumping
- Converts quickly from trimmer to edger for versatile edge cleanup
- Adjustable telescoping shaft and soft-grip handle improve comfort during use
- Battery runtime is limited for extended heavy-duty work and may require a spare battery
- Not intended for commercial or continuous professional use
Verdict: A comfortable, easy-to-use cordless trimmer/edger kit that balances power and convenience for typical homeowner yard maintenance.
Choosing the Right 40V Cordless String Trimmer: Key Factors to Consider
Cutting Power and Torque
A 40V trimmer should offer enough torque to slice through thick grass, tall weeds, and occasional tough patches without bogging down. Higher torque matters when you push the head into dense growth or climb banks and slopes. Less powerful motors will work on thin lawn grass but struggle with viney or fibrous stems.
Consider how the motor delivers power under load. Brushless motors typically run cooler and maintain torque longer, which translates to fewer stalls and smoother passing through heavy patches. If your yard has a lot of volunteer weeds, bulbous roots, or overgrown edges, prioritize higher torque ratings and robust cutting heads.
Battery Runtime and Compatibility
Runtime is the limiting factor for cordless tools. A single 40V battery should provide enough juice for medium-sized yards without constant swapping. Look for models with higher amp-hour ratings and those that are compatible with larger capacity batteries from the same platform.
Also think about the battery ecosystem. If you already own other 40V tools from the same manufacturer, cross-compatibility lets you share batteries and chargers, which changes how many spare packs you need. Consider charging speed and whether the manufacturer offers an upgraded pack with higher amp-hours for extended sessions.
Balance, Weight, and Ergonomics
How a trimmer feels on your shoulder and in your hands directly affects how long you can work without fatigue. A well-balanced 40V trimmer transfers weight toward the shaft and head, reducing leverage on your wrist and shoulder. Lightweight does not always mean comfortable; the distribution of mass matters more than absolute pounds.
Check for adjustable front handles, telescoping shafts, or pivoting gear heads that let you set a comfortable working posture. Controls should be reachable without shifting your grip, and safety cutoffs should be simple to operate. For long runs or frequent edging, ergonomic touches make maintenance chores quicker and less tiring.
Cutting Head and Line System
The head design determines how easily you feed line, replace spools, and adapt to different line sizes. Bump-feed heads are common and simple, but advanced quick-load or pre-wind systems reduce downtime. Dual-line heads cut wider swaths while single-line heads use less battery at light trimming tasks.
Also consider compatibility with thicker line for heavy-duty work and whether the head accepts specialty lines for edging or brush. A head that resists clogging with wet grass and one that lets you change line without tools can save significant time across a season.
Build Quality and Weather Resistance
Outdoor tools face sun, moisture, and rough handling. Plastics, seals around the motor housing, and metal components at load points should be durable enough for regular yard work. Corrosion-resistant fasteners and a reinforced gearbox area extend service life.
A trimmer that tolerates damp grass and occasional rain without seizing or allowing water into electronics reduces the likelihood of early failure. Consider how easy it is to inspect and clean the cutting head and whether common wear parts are user-replaceable.
Maintenance and Serviceability
Routine upkeep-replacing line, checking the guard, cleaning debris, and occasionally inspecting the gearbox-keeps a trimmer running dependably. Models designed for homeowner maintenance have accessible fasteners, clear access to the head, and readily available replacement spools and parts.
Consider whether the shaft uses common fittings and whether the manufacturer provides clear instructions for simple repairs. Tools that require special tools or factory service for basic upkeep add time and cost over the life of the trimmer.
Best Uses for a 40V Cordless Trimmer
A 40V cordless string trimmer fits homeowners with medium to large lawns, small acreage, or properties with mixed vegetation types. It bridges the gap between lightweight battery trimmers for small yards and gas models for heavy-duty jobs, providing enough power for regular edging, trimming around beds, and cutting back thick grass without excessive noise or fumes.
- Medium to large suburban yards
- Edging sidewalks and driveways
- Maintenance of garden beds and fence lines
- Jobs where gas is impractical or restricted
Drive Systems and Motor Types Explained
Understanding whether a trimmer uses a brushed or brushless motor helps predict efficiency and longevity. Brushless motors are more efficient and usually preserve battery life under load, while brushed motors are simpler and can still be effective in lighter applications. The drive geometry and gearbox quality influence how smoothly power transfers to the cutting head.
- Brushless motors for sustained torque and efficiency
- Gearbox protection for heavy use
- Direct drive vs gearbox considerations
Battery Care and Charging Best Practices
To maximize 40V battery life, avoid complete deep discharge on every session and store packs partially charged in a cool, dry place. Fast charging is convenient, but frequent rapid charges at high heat can accelerate capacity loss over years. Rotate packs if you have more than one to reduce wear on any single battery.
- Store batteries out of extreme heat or cold
- Avoid draining to zero routinely
- Keep contacts clean and dry
Trimming Techniques for Cleaner Results
Use the trimmer head angle and body stance to produce neat edges without scalping turf. For edging, a perpendicular pass along a sidewalk creates a crisp border; for general trimming, an angled sweep reduces missed patches. Slow, steady passes are more effective than aggressively forcing the head through dense growth, which can gum up the line or stall the motor.
- Angle head perpendicular for edging
- Sweep with steady, overlapping strokes
- Pause to clear heavy clumps rather than forcing through
Storage and Winter Prep
Before storing your 40V trimmer for an extended period, remove the battery and store it partially charged in a cool spot. Clean clippings from the head and guard to prevent corrosion and pests. Lubricate any specified drive components and check for line wear or damaged guards so the tool is ready to use in spring.
- Remove battery for storage
- Clean and inspect head and guards
- Replace worn line and tighten fasteners
How We Chose the Best 40V Cordless String Trimmer
We focused on real-world use and durability for homeowners and garden maintenance pros who prefer battery power. Selection began by identifying 40V cordless string trimmers with documented motor types and battery system specs suitable for medium to heavy lawn work. We then filtered for models that balance cutting power with ergonomics and a reasonable runtime per battery charge. Key evaluation criteria included cutting power and torque for thick grass and small weeds; battery capacity and runtime for realistic yard sizes; balance, weight, and shaft design for prolonged use; head and line systems for easy feeding and replacement; and build quality and weather resistance for season-after-season reliability. We excluded handheld-only or accessory heads intended primarily as blowers or edgers. Units lacking clear battery compatibility, modest user-serviceability, or poor reported durability were not considered. The final shortlist reflects tools that reliably deliver the torque and run time gardeners expect from a 40V platform while keeping handling and maintenance simple. These are the practical, usable options that performed consistently against our criteria.
FAQ
How long will a 40V battery typically run on a single charge?
Runtime often depends on battery amp-hour rating and the workload. For moderate trimming, expect enough runtime for a medium lawn on a single higher-capacity 40V pack; heavy, continuous cutting will shorten that and may require a spare pack.
Can a 40V trimmer handle thick weeds and small saplings?
It usually handles thick grass and tough weeds well, especially with a brushless motor and heavier line. Small saplings or woody stems may still be better handled with a brushcutter or pruning tool depending on thickness.
Is line replacement difficult on modern trimmer heads?
Many modern heads offer quick-load or tool-free replacement designs that make line changes straightforward. Older bump-feed heads are slightly more fiddly but still manageable with basic instructions.
Do 40V trimmers require special maintenance compared with gas models?
They need less routine mechanical maintenance since there is no engine oil or fuel to manage, but you still need to clean the head, inspect fasteners, and care for batteries. Electrical components benefit from dry storage and occasional inspection.
Will a 40V trimmer be quieter than a gas trimmer?
Yes, battery trimmers are noticeably quieter than gas models, which makes them more suitable for residential areas and noise-sensitive jobs.
Final Verdict
A 40V cordless string trimmer balances power and user-friendliness for most homeowners and light professionals. Prioritize torque and battery runtime if your yard includes dense grass or long edges, and pay close attention to balance and head convenience when you expect extended use. Decide based on the work you do most often: choose a higher-capacity battery and robust head for heavy or frequent trimming, or favor lighter weight and ergonomics if you do short, regular maintenance. With the right tradeoffs, a 40V trimmer will simplify seasonal upkeep and reduce noise and maintenance compared with gas alternatives.
