Buying Guide
Our Guide to the Best 40V Cordless String Trimmers
The best 40V cordless string trimmers compared, a step up in power from 20V options for larger yards and thicker growth across multiple brands.
By Gardening Is Ezee Editors
8 min read3 products evaluated
40V sits between widely available 20V string trimmers and premium professional-grade platforms, offering more sustained cutting power for larger yards and thicker growth.
Gardening Is Ezee field notes
The Garden Fit Check
A quick way to connect the shortlist to the space, workload and ownership details that matter after the box arrives.
- Start with the job
- Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger leads this shortlist for buyers wanting 2-in-1 functionality with 40V power. Use that fit as a reference point, then compare the alternatives against your own space and workload.
- Specs that separate the picks
- The first details to compare are 13-Inch Swath, 40V System. Confirm the exact model and included components before ordering.
- Trade-off to plan for
- Narrower swath than the WORX 40V model
The Practical Shortlist
A garden-first look at 3 options, organized around the job each one suits best.
Best Overall
Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger
buyers wanting 2-in-1 functionality with 40V power
Our take Check price for Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger (opens in a new tab)
Best Wider Swath Pick
Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183
buyers wanting a dedicated 40V trimmer without combo features
Our take Check price for Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183 (opens in a new tab)
Best Bare Tool Pick
Greenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included
buyers comparing capacity, compatibility, included components and storage needs
Our take Check price for Greenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included (opens in a new tab)
| Pick | Best for | Key spec | Price |
|---|---|---|---|
| buyers wanting 2-in-1 functionality with 40V power | 13-Inch Swath | Check price for Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger (opens in a new tab) |
| buyers wanting a dedicated 40V trimmer without combo features | 13-Inch Swath | Check price for Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183 (opens in a new tab) |
| buyers comparing capacity, compatibility, included components and storage needs | 40V System | Check price for Greenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included (opens in a new tab) |
Why Each Pick Made the Cut
Best Overall1 of 3
Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger on Amazon (opens in a new tab)
Choose Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger for genuinely complete kit, battery and charger included.
Best for
- buyers wanting 2-in-1 functionality with 40V power
Why it made the shortlist
Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger is positioned for buyers wanting 2-in-1 functionality with 40V power. The documented setup centers on 13-Inch Swath, 40V MAX System, 2-in-1 Function.
The feature doing most of the work here is genuinely complete kit, battery and charger included. Its 40V MAX System specification sits at the same documented level as the comparable picks in this 3-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The practical constraint here is narrower swath than the WORX 40V model. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 13-Inch Swath
- 40V MAX System
- 2-in-1 Function
Pros
- Genuinely complete kit, battery and charger included
- Doubles as both a trimmer and an edger
- More sustained 40V power for thicker growth
Cons
- Narrower swath than the WORX 40V model
- 40V batteries aren't compatible with 20V Black+Decker tools
Best Wider Swath Pick2 of 3
Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183 on Amazon (opens in a new tab)
Choose Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183 for genuine WORX manufacturing and warranty backing overall.
Best for
- buyers wanting a dedicated 40V trimmer without combo features
Why it made the shortlist
Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183 is positioned for buyers wanting a dedicated 40V trimmer without combo features. The documented setup centers on 13-Inch Swath, 40V System, standalone Trimmer.
The feature doing most of the work here is genuine WORX manufacturing and warranty backing overall. Its 40V System specification sits at the same documented level as the comparable picks in this 3-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The practical constraint here is no 2-in-1 edger function like the Black+Decker pick. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 13-Inch Swath
- 40V System
- Standalone Trimmer
Pros
- Genuine WORX manufacturing and warranty backing overall
- 13-inch swath covers substantial ground per pass
- More sustained 40V power for thicker growth
Cons
- No 2-in-1 edger function like the Black+Decker pick
Best Bare Tool Pick3 of 3
Greenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included on Amazon (opens in a new tab)
Greenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included is the better fit when buyers comparing capacity, compatibility, included components and storage needs.
Best for
- buyers comparing capacity, compatibility, included components and storage needs
Why it made the shortlist
The intended use case is buyers comparing capacity, compatibility, included components and storage needs. The documented setup centers on 40V System, bare Tool.
What separates it on paper is genuine Greenworks manufacturing and warranty backing overall. Its 40V System specification sits at the same documented level as the comparable picks in this 3-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
Before committing, account for sold bare tool, battery and charger not included. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 40V System
- Bare Tool
- Compared using published specifications, included components, compatibility, and practical trade-offs.
Pros
- Genuine Greenworks manufacturing and warranty backing overall
- Suits existing Greenworks 40V battery owners well
Cons
- Sold bare tool, battery and charger not included
- Real cost is higher without existing Greenworks 40V batteries
How We Built This Shortlist
Each pick was assessed across 3 criteria weighted for real-world use.
- Real, Current Listings
- We compared capacity, compatibility, included components, operating limits and warranty documentation.
- Cross-Brand Comparison
- We compared 40V models from three different brands, confirming each uses its own non-interchangeable battery platform.
- Function and Kit Completeness
- We noted 2-in-1 versus standalone functionality and which models include a battery versus being sold bare tool.
What Matters Before You Choose a 40V Cordless String Trimmers (2026)
Key buying criteria so you get the right fit the first time.
40V vs. 20V Power Difference
40V generally delivers more sustained cutting power through thicker growth than typical 20V options, a genuine advantage for larger yards or overgrown weeds.
If your yard is routine and moderate in size, a 20V option may be sufficient without the added weight of a 40V system.
Cross-Brand Battery Incompatibility
These three 40V models come from different brands, each with its own non-interchangeable battery platform despite sharing the same voltage label.
Match the brand to your existing battery ecosystem rather than assuming 40V tools from different brands are compatible.
2-in-1 vs. Standalone Function
One model here doubles as both a trimmer and edger, while another is a dedicated standalone trimmer.
Decide whether combo functionality matters enough to justify choosing one brand's 40V platform over another.
Match a 40V Cordless String Trimmers (2026) to Your Garden or Yard
By Priority
| Priority | Recommended Pick |
|---|---|
| 2-in-1 combo, complete kit | Black+Decker 40V MAX |
| Dedicated standalone trimmer | WORX WG183 40V |
| Existing Greenworks 40V owner | Greenworks Bare Tool |
By Budget
| Budget | Recommended Pick |
|---|---|
| Compared using published specifications, included components, compatibility, and practical trade-offs. | Greenworks 40V |
| Mid-range complete kit | Black+Decker 40V MAX |
| Compared using published specifications, included components, compatibility, and practical trade-offs. | WORX WG183 |
Combo vs. Standalone: The Verdict
The right choice depends on whether you want edging functionality bundled in.
- Choose a combo model if
- You want both trimming and edging in one 40V purchase.
- Choose a standalone model if
- Maximum single-function cutting performance matters more than combo features.
By Existing Battery Investment
| Situation | Recommended Pick |
|---|---|
| Already own Greenworks 40V batteries | Greenworks Bare Tool |
| No existing 40V batteries | Black+Decker or WORX complete options |
For Larger Yards Specifically
- Look for
- 40V or higher power for sustained cutting through thicker growth across a larger area.
- In this comparison
- All three models specifically run on the 40V platform for this purpose.
When to Step Up to 60V or 80V
- Step up if
- Your property is large enough and growth thick enough that even 40V feels underpowered.
- Stay at 40V if
- A moderate-to-large residential yard is your actual use case.
Before You Bring One Home
Is 40V significantly more powerful than 20V for string trimmers?
Yes, 40V generally delivers more sustained cutting power through thicker growth, a genuine advantage over typical 20V options for larger or more overgrown yards.
Are 40V batteries interchangeable across different brands?
No, despite sharing the same voltage label, each brand's 40V battery platform is proprietary and not interchangeable with another brand's 40V tools.
Do 40V string trimmers include a battery and charger?
It varies by listing. Two of the three models compared here include a battery and charger as a complete kit, while one is sold bare tool for existing battery owners.
Which 40V string trimmer has the widest cutting swath?
The Black+Decker and WORX models both use a 13-inch swath in this comparison, wider than the Greenworks model's 12-inch swath.
Bottom Line
Best overall: Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger — best overall pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all 40v cordless string trimmers (2026) on Amazon — Prime-eligible options with current pricing.