Best 40V Cordless String Trimmers (2026)
The best 40V cordless string trimmers compared, a step up in power from 20V options for larger yards and thicker growth across multiple brands.
At a Glance
Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger
↓ See why we picked itWorx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183
↓ See why we picked itGreenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included
↓ See why we picked it40V sits between widely available 20V string trimmers and premium professional-grade platforms, offering more sustained cutting power for larger yards and thicker growth. We compared three current 40V models across different brands on price and function.
3 Criteria to Look For Before Buying 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.
Best 40V Cordless String Trimmers (2026)
Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger
About this pick
This complete kit doubles as both a trimmer and edger on the 40V platform, with battery and charger included at a reasonable price for the added power tier.
For a buyer who wants 2-in-1 functionality with more sustained power than 20V provides, this is the strongest overall pick in this comparison.
Best for: buyers wanting 2-in-1 functionality with 40V power
Check price on AmazonSpecs
- Swath: 13-Inch
- System: 40V MAX
- Function: 2-in-1
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
Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183
About this pick
This standalone WORX model matches the Black+Decker pick's swath width without combo edger functionality, focusing on maximum single-function cutting performance.
At a higher price than the Black+Decker pick, this suits a buyer who specifically wants a dedicated trimmer rather than combo functionality.
Best for: buyers wanting a dedicated 40V trimmer without combo features
Check price on AmazonSpecs
- Swath: 13-Inch
- System: 40V
- Function: 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
- −Higher price than the Black+Decker 40V complete kit
Greenworks 40V 12-Inch Cordless String Trimmer, Battery and Charger Not Included
About this pick
Sold bare tool without a battery, this Greenworks model offers the lowest listed price in this comparison, for an existing Greenworks 40V battery owner.
The real total cost is higher for a buyer starting fresh, so this makes most sense specifically for someone already invested in Greenworks' 40V platform.
Best for: existing Greenworks 40V owners wanting the lowest listed price
Check price on AmazonSpecs
- Voltage: 40V
- Sold As: Bare Tool
- Price Tier: Lowest Listed
Pros
- +Lowest listed price among the 40V options compared here
- +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 Evaluated These 40V Cordless String Trimmers (2026)
Each pick was assessed across 3 criteria weighted for real-world use.
Real, Current Listings
All three products are currently listed 40V string trimmers verified against live Amazon catalog data for price and stated specifications.
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.
How to Choose the Right 40V Cordless String Trimmers (2026)
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 |
|---|---|
| Lowest listed price, own battery needed | Greenworks 40V |
| Mid-range complete kit | Black+Decker 40V MAX |
| Standalone, higher price | 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.
Frequently Asked Questions
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 rankings above for all picks with pros, cons, and best-for summaries.
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