How long does a DeWalt DCST970 battery last when trimming thick weeds?

The DeWalt DCST970 with a 9.0Ah battery can run for up to 45 minutes under heavy use on thick weeds before requiring a recharge.

Are cordless string trimmers powerful enough for dense brush?

High-end models like the Milwaukee M18 FUEL can handle dense brush, delivering up to 6,200 RPM with a brushless motor.

Top 5 Cordless String Trimmers for Tackling Thick Weeds in 2026

Tired of fighting with thick weeds and tangled grass using tools that just don't cut it? Cordless string trimmers are a big shift for homeowners dealing with tough yard jobs. They offer the convenience of portability without sacrificing power. We've rounded up the five best models in 2026 to ensure your garden stays pristine.

Why Choose Cordless String Trimmers?

Cordless string trimmers have come a long way. Gone are the days of bulky gas-powered tools and tangled extension cords. These modern trimmers combine efficient battery technology with lightweight designs, making them perfect for maneuvering around tight spaces or large properties. Brands like DeWalt, Ryobi and Milwaukee are leading the charge.

For smaller yards, a model with a 4.0Ah battery might be enough. But if you're tackling dense overgrowth or trimming acres of land, look for options with 6.0Ah or 9.0Ah batteries. Runtime and cutting power are critical here.

Best Cordless String Trimmers for Thick Weeds

1. DeWalt DCST970X1

The DeWalt DCST970X1 features a 60V MAX FlexVolt battery, offering up to 45 minutes of runtime on thick weeds. Its brushless motor provides consistent power, even for heavy-duty jobs. The adjustable cutting width (15-17 inches) adds versatility.

Pros: Reliable performance, ergonomic handle, durable build.
Cons: Heavier than average, priced at $299.

If you already own other DeWalt 60V tools, this trimmer is a smart addition. Plus, the battery is interchangeable across the FlexVolt lineup. Check out compatible tools here.

2. Ryobi RY40290VNM

Ryobi's RY40290VNM is an affordable option at $179, ideal for medium-duty tasks. Powered by a 40V battery, it delivers up to 4,000 RPM and comes with a variable speed trigger for precision control. It’s lightweight at just 11 pounds.

Pros: Budget-friendly, adjustable shaft height, easy to handle.
Cons: Less effective on very thick weeds, shorter runtime.

This trimmer pairs well with Ryobi’s other 40V tools, like the Ryobi leaf blower, making it a great pick for small to medium yards.

3. Milwaukee M18 FUEL 2825-21ST

If power is your priority, the Milwaukee M18 FUEL is a beast. Its 18V battery delivers up to 6,200 RPM, and it can handle dense brush and weeds effortlessly. The Quick-Lok attachment system adds versatility for other yard tools.

Pros: Extreme power, multiple attachments available, comfortable to use.
Cons: Premium price tag at $329.

This model is a favorite among professional landscapers. Pair it with Milwaukee’s random orbital sander for a complete cordless toolset.

4. EGO Power+ ST1521S

Priced at $229, the EGO Power+ ST1521S boasts a 56V ARC Lithium battery. Its automatic line feeding system reduces downtime, and the carbon fiber shaft keeps it lightweight. The 15-inch cutting swath is perfect for wide areas.

Pros: Long battery life (up to 60 minutes), durable materials, quick line loading.
Cons: Slightly less power on very tough weeds.

EGO is known for its new battery technology, which also powers their pressure washers, making it a versatile brand for homeowners.

5. Greenworks Pro ST80L210

The Greenworks Pro ST80L210 features an 80V battery system for high-performance trimming. It’s perfect for tackling thick weeds and brush with a 16-inch cutting swath and up to 45 minutes runtime. At $249, it’s a mid-range choice.

Pros: High voltage, durable build, ergonomic design.
Cons: Slightly louder than some competitors.

Pair this trimmer with the Greenworks garage storage solutions for an organized workspace. Learn more about storage options here.

Comparison Table

| Model | Voltage | Cutting Width | Runtime (Minutes) | Weight (lbs) | Price | |----------------------|---------|---------------|--------------------|--------------|---------| | DeWalt DCST970X1 | 60V | 15-17 inches | Up to 45 | 13 | $299 | | Ryobi RY40290VNM | 40V | 13 inches | Up to 30 | 11 | $179 | | Milwaukee M18 FUEL | 18V | 16 inches | Up to 40 | 12 | $329 | | EGO Power+ ST1521S | 56V | 15 inches | Up to 60 | 10 | $229 | | Greenworks Pro ST80L210 | 80V | 16 inches | Up to 45 | 12 | $249 |

FAQ

What’s the most powerful cordless string trimmer for heavy-duty jobs?

The Milwaukee M18 FUEL 2825-21ST stands out for its 6,200 RPM brushless motor and Quick-Lok attachment system. It's the top choice for dense brush and thick weeds.

How long do cordless string trimmer batteries last?

High-capacity batteries like DeWalt’s 9.0Ah FlexVolt can last up to 45 minutes on tough vegetation. Smaller batteries, like Ryobi’s 4.0Ah, typically run for 25-30 minutes.

Are cordless string trimmers worth the investment?

For homeowners with small to medium yards, models like the Ryobi RY40290VNM at $179 offer excellent value. For professionals or larger properties, investing in high-voltage options like the Milwaukee M18 FUEL or Greenworks Pro pays off in performance and durability.

Can cordless trimmers handle professional landscaping?

Yes. Professional-grade models like the Milwaukee M18 FUEL and DeWalt DCST970X1 are designed for heavy-duty use. They offer comparable power to gas-powered models and include features like adjustable cutting widths and brushless motors.

How do I maintain a cordless string trimmer?

Regularly clean debris from the trimmer head and shaft. Replace the line when it wears out, usually every 10-15 uses, and keep the battery charged but avoid overcharging to extend its lifespan.