A cordless string trimmer cuts grass and weeds along fences, beds and walkways without a cord or fuel. The key choices are cutting width, how the line feeds, and which battery platform it uses. Many trimmers are sold as bare tools, so battery and charger may be extra.
The six trimmers below run from a 10 inch 18V model to 16 inch brushless units. Specs come from each product’s Amazon listing and runtime figures are the makers’ own. We have not used these trimmers ourselves.
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What to Look For
| Feature | Why it matters |
|---|---|
| Cutting width | Wider swaths cover more per pass; narrow ones suit tight beds |
| Line feed | Auto feed, bump feed and push-button loading differ |
| Voltage platform | Choose a battery you can share with other tools |
| In the box | Check whether battery and charger are included |
Specs at a Glance
| Trimmer | Width and voltage | Weight | Notes |
|---|---|---|---|
| EGO ST1610T | 16 in; 56V | 7.5 lb | Telescopic carbon fiber shaft; battery not included |
| EGO ST1620T | 16 in; 56V | 7.7 lb | LINE IQ autofeed; 2-speed selector; tool only |
| Greenworks BST4000 | 12 in; 40V | 8.4 lb | Auto feed head; variable speed trigger; bare tool |
| Greenworks ST40L03 | 16 in; 40V | 11.3 lb listed | Brushless; attachment capable; tool only |
| RYOBI P2030 | 10 in; 18V | 4 lb | Trimmer and edger; limited listing detail |
| BLACK+DECKER MTC220 | 12 in; battery | 9.9 lb | 3-in-1 with mower deck; 2 batteries and charger |
The 6 Best Cordless String Trimmers
1. EGO POWER+ 16 Inch String Trimmer (ST1610T)
A 16 inch brushless trimmer with POWERLOAD line loading, a telescopic carbon fiber shaft and a 0.095 inch dual line. The maker cites up to 45 minutes of runtime with a 2.5Ah 56V battery, sold separately. Battery and charger are not included.
Suits: EGO 56V owners. Strengths: easy line loading, adjustable shaft. Weaknesses: bare tool. Skip it if you have no EGO battery.
View EGO POWER+ 16 inch String Trimmer POWERLOAD Telescopic Shaft ST1610T on Amazon
2. EGO POWER+ 16 Inch String Trimmer with LINE IQ (ST1620T)
The same 16 inch class with LINE IQ autofeed, a digital 2-speed selector and POWERLOAD. The maker cites up to 60 minutes of cut time with a 4.0Ah 56V battery, sold separately.
Suits: users who dislike bumping the head. Strengths: autofeed and two speeds. Weaknesses: bare tool. Skip it if you want a lighter trimmer.
View EGO POWER+ 16 inch String Trimmer POWERLOAD LINE IQ Telescopic Shaft ST1620T on Amazon
3. Greenworks 40V 12 Inch String Trimmer (BST4000)
A 12 inch trimmer using 0.065 inch line with an auto feed head and a variable speed trigger. It is sold without battery or charger and takes 40V G-MAX batteries. The listing mentions 60 minutes of average battery life, which depends on the battery used.
Suits: small yards. Strengths: auto feed, variable trigger. Weaknesses: narrow path, bare tool. Skip it if you need a wide swath.
4. Greenworks 40V 16 Inch String Trimmer (ST40L03)
A 16 inch brushless trimmer with 0.095 inch dual line, a 2-speed control and a variable trigger. It accepts Greenworks edger, hedge, pole saw, cultivator and blower attachments. The listing weight of 11.3 pounds is higher than the 12 inch model, so confirm before buying.
Suits: a 40V system with attachments. Strengths: wide path, attachment support. Weaknesses: bare tool, listed weight. Skip it if you want the lightest option.
View Greenworks 40V 16 inch Cordless String Trimmer Tool Only ST40L03 on Amazon
5. RYOBI ONE+ 18V String Trimmer and Edger (P2030)
A 10 inch, 4 pound 18V trimmer and edger. The listing gives few details beyond the cutting width and weight, and the item count field shows three, which is unclear. We rely only on the overview fields.
Suits: ONE+ 18V owners with small areas. Strengths: light at 4 pounds. Weaknesses: narrow, thin listing. Skip it if you need a wide cut.
View Ryobi One+ 18-Volt Lithium-ion Cordless Electric String Trimmer and Edger on Amazon
6. BLACK+DECKER 3-in-1 Trimmer, Edger and Mower (MTC220)
A 12 inch convertible tool with two batteries and a charger, an AFS automatic feed spool and PowerDrive transmission. The wheeled deck turns it into a small push mower for tight or sloped spots. It weighs 9.9 pounds.
Suits: small lawns. Strengths: batteries included, three functions. Weaknesses: heavier, small mower. Skip it if you only want a trimmer.
View BLACK+DECKER Weed Eater Lawn Edger and Cordless Lawn Mower 3 in 1 Combo MTC220 on Amazon
Care and Setup
- Match the battery platform before choosing a tool-only model.
- Use the line diameter the maker lists.
- Clear grass wrapped around the head after use.
- Store the tool and batteries indoors.
Mistakes to Avoid
- Buying a bare tool without a battery.
- Expecting runtime figures to hold in thick growth.
- Choosing a wide swath for tight beds.
- Mixing up corded and cordless models with similar names.
Cordless String Trimmer FAQ
Are batteries included?
Only the BLACK+DECKER lists batteries and a charger. The EGO and Greenworks models are tool only.
How long will it run?
Runtime depends on the battery and the work. The figures above are the makers’ own.
The Short Version
For a telescopic shaft, the EGO ST1610T. For autofeed, the EGO ST1620T. For small yards, the Greenworks 12 inch. For attachments, the Greenworks 16 inch. For light and small, the RYOBI. For a trimmer plus mower, the BLACK+DECKER.