If you're dealing with overgrown weeds or stubborn brush, a cordless string trimmer can be a lifesaver. Unlike gas models, these battery-powered tools are quieter, require less maintenance, and eliminate the hassle of fuel mixing. But not all cordless trimmers are tough enough for thick weeds. To save you time, we've tested and compared the top models for heavy-duty use.

What Makes a Great Cordless Trimmer for Thick Weeds?

Cutting through thick weeds requires power, durability, and the right line size. Look for models with brushless motors, as they deliver more torque and last longer than brushed motors. Additionally, a trimmer with a cutting swath of at least 14 inches will help you cover more ground quickly. For particularly tough weeds, you'll want a trimmer that supports thicker lines (0.080 inches or larger).

Battery capacity is another key factor. A 5.0Ah battery typically provides around 45 minutes of runtime, though some models like the Greenworks Pro 80V can push up to an hour. Finally, consider the weight. A lightweight design (under 12 lbs) is easier to maneuver, especially for extended use.

Top Picks for Heavy-Duty Cordless String Trimmers

1. EGO Power+ ST1521S

  • Price: $229
  • Cutting Swath: 15 inches
  • Battery: 56V 2.5Ah
  • Weight: 11.2 lbs
  • Highlights: The EGO Power+ ST1521S offers impressive power and runtime. Its carbon fiber shaft is durable yet lightweight, and the telescoping design adds versatility. The automatic line loading system is a standout feature, saving time during reloads. Ideal for medium to large yards.

2. Milwaukee M18 FUEL String Trimmer

  • Price: $299
  • Cutting Swath: 16 inches
  • Battery: M18 REDLITHIUM 9.0Ah
  • Weight: 12 lbs
  • Highlights: Milwaukee's M18 FUEL stands out for its torque. It's a beast For thick weeds, thanks to its POWERSTATE brushless motor. Though heavier than other options, the performance makes up for it. A great choice for professionals or large properties.

3. DeWalt DCST970X1 FlexVolt

  • Price: $319
  • Cutting Swath: 15 inches
  • Battery: 60V 3.0Ah
  • Weight: 12 lbs
  • Highlights: Known for its durability, the DeWalt DCST970X1 is built for tough tasks. It features a high-efficiency brushless motor and supports thicker trimmer lines for tackling stubborn weeds. It’s on the heavier side, but its long runtime compensates.

4. Greenworks Pro 80V

  • Price: $249
  • Cutting Swath: 16 inches
  • Battery: 80V 2.0Ah
  • Weight: 10 lbs
  • Highlights: The Greenworks Pro 80V trimmer is surprisingly lightweight, making it easier to handle for longer sessions. It delivers strong cutting power and comes with a rapid charger that replenishes the battery in 30 minutes, perfect for quick turnarounds.

5. Ryobi RY402110VNM

  • Price: $199
  • Cutting Swath: 15 inches
  • Battery: 40V 4.0Ah
  • Weight: 11 lbs
  • Highlights: For budget-conscious buyers, the Ryobi RY402110VNM is a solid pick. It handles thick weeds well, though it’s slightly less powerful than higher-voltage models. The adjustable cutting head and variable speed trigger allow for precise trimming.

| Model | Price | Cutting Swath | Battery | Weight | Key Feature | |---------------------------|-------|---------------|-------------|--------|---------------------------------| | EGO Power+ ST1521S | $229 | 15 inches | 56V 2.5Ah | 11.2 lbs | Carbon fiber shaft + easy reload | | Milwaukee M18 FUEL | $299 | 16 inches | M18 9.0Ah | 12 lbs | High torque, built for pros | | DeWalt DCST970X1 FlexVolt | $319 | 15 inches | 60V 3.0Ah | 12 lbs | Durable, supports thick lines | | Greenworks Pro 80V | $249 | 16 inches | 80V 2.0Ah | 10 lbs | Lightweight, fast charging | | Ryobi RY402110VNM | $199 | 15 inches | 40V 4.0Ah | 11 lbs | Adjustable cutting head |

What Most Reviews Miss

Surprisingly, cutting swath isn’t always the most important metric for efficiency. Wider swaths can clear more area, but they may struggle with dense weeds if the motor isn’t strong enough. That’s why models like the Milwaukee M18 FUEL, with its solid torque, outperform even larger swaths in tough conditions. Look for balance between motor power and swath size.

Related Tools for Yard Work

If you’re upgrading your yard equipment, check out our guides to the best cordless leaf blowers for yard work and best cordless drills for DIY projects. Both are excellent additions to your toolkit.

Make sure to assess your yard’s needs before making a purchase. If you have a small space, a lighter trimmer like the Ryobi might suffice. For larger yards or commercial properties, investing in something like the Milwaukee M18 FUEL could save you time and effort.