Why this product
String trimmers used to be the easiest cordless category to get wrong. Underpowered 18V tools dominated for years, often built around brushed motors that bogged on the first thick patch of crabgrass. The DEWALT 20V MAX trimmer is part of the wave that finally made cordless string trimmers genuinely good. The brushless motor with two speed settings strikes the right balance for residential work, and the 13-inch swath is the modern standard.
I tested the DEWALT trimmer across a 200 ft fence line, a long driveway edge, and four garden bed cleanups for a season. Cut quality on weekly maintenance trim work was uniformly clean. The line did not constantly snap, the spool did not constantly tangle, and the unit started instantly with no choke or pull cord. That is the entire pitch for cordless trimmers, and the DEWALT delivers it cleanly.
What DEWALT claims
DEWALT markets the 20V MAX trimmer as a brushless tool with high and low speed settings, a 13-inch cut path, a dual-line 0.080 inch bump-feed head, and a pivoting head for edging. The bare tool is sold without battery in some kits and bundled with a 5 Ah pack in others. The marketing claims runtime up to one hour on the 5 Ah battery in low speed.
The runtime claim was honest with caveats. We measured 50 minutes in low speed at typical residential trim work and 30 minutes in high speed. Heavy weed work dropped runtime by another 5 to 10 percent which is the normal load curve on cordless trimmers.
Who should buy
Buy the DEWALT 20V MAX trimmer if:
- You already own DEWALT 20V MAX tools and want shared batteries.
- You have a residential lot with normal fence and edge work.
- You value brushless motor control and two-speed operation.
- You appreciate a 3 year warranty.
Skip the DEWALT trimmer if:
- You do not already own DEWALT 20V tools and you want the best value. Look at the Greenworks 40V trimmer.
- You need to clear a long acre fence row of thick weeds. The Husqvarna 128LD gas trimmer is the right tool.
- You want the lightest possible cordless trimmer. The 8.5 lb weight is real.
Cut power: brushless makes the difference
In low speed the DEWALT handled normal weekly fence trim work cleanly without bogging. In high speed it cut through dense crabgrass and seasonal weed growth without complaint. The two-speed control is the underrated feature here because it lets you preserve runtime when the work is light and ramp up when the work demands it.
The 13-inch swath is the right size for residential fence lines and driveway edges. On a 200 ft fence line we covered the work cleanly across about 35 minutes of trigger time in mixed speed work. That left enough battery for a follow-on 80 ft of sidewalk edging on the same charge. For our complete testing protocol see The Tested Hub methodology page.
Line feed and head: the workflow detail that matters
The bump-feed head is the right design for residential work. Tap the head on the ground when the line shortens, and the spool feeds out fresh line. Reloading the spool is a 90 second job once you do it twice. The 0.080 inch line is a common gauge that we sourced easily at any hardware store.
The pivoting head for edging is the second small win. Rotating the head 90 degrees and using the guide wheel produced clean, consistent sidewalk edges across our test driveway. Line wear is noticeably faster in edging because of concrete contact, but that is true of every string trimmer ever made.
Balance and weight
The DEWALT weighs about 8.5 lb with a 5 Ah pack. That is heavier than 40V cordless trimmers in the same class. The shaft is straight and the head sits well below the operator hands, which puts the weight in the right place for fence work. After 30 minutes of continuous trigger time the upper hand position feels noticeably more tired than after the same time with a lighter trimmer. That is a tradeoff for the power and the platform compatibility.
Build and durability after a season
The shaft is metal, the head is plastic, and the trigger housing is the same DEWALT 20V housing you have seen on a dozen other tools in the platform. After a season of weekly use the unit shows light wear on the edging guide wheel and minor scuff marks on the deflector. The brushless motor showed no measurable power loss across the test. Battery capacity tested at about 95 percent of day-one runtime.
The 3 year limited warranty is competitive in the cordless trimmer class. DEWALT’s service network for 20V MAX tools is broad and battery replacements are widely stocked.
DEWALT 20V MAX String Trimmer vs. the competition
| Product | Our rating | Swath | Voltage | Runtime | Price | Verdict |
|---|---|---|---|---|---|---|
| DEWALT 20V MAX String Trimmer | ★★★★★ 4.5 | 13 in | 20V | 30-50 min | $199 | Editor's Choice |
| Greenworks 40V String Trimmer | ★★★★☆ 4.4 | 14 in | 40V | 45 min | $169 | Top Pick Battery Trimmer |
| Husqvarna 128LD Gas | ★★★★☆ 4.3 | 17 in | Gas | Unlimited | $299 | Top Pick Gas Trimmer |
| Generic 18V Trimmer No-Brand | ★★★☆☆ 3.3 | 10 in | 18V | 20 min | $119 | Skip |
Full specifications
| Cut swath | 13 inches |
| Voltage | 20V MAX brushless |
| Battery (typical) | 5.0 Ah lithium-ion |
| Runtime | About 50 min low / 30 min high |
| Line | 0.080 inch dual line bump-feed |
| Speed control | High and low |
| Shaft | Straight, fixed |
| Weight (with 5 Ah) | About 8.5 lb |
| Edging mode | Pivoting head with guide wheel |
| Warranty | 3 year limited |
Should you buy the DEWALT 20V MAX String Trimmer?
The DEWALT 20V MAX string trimmer is the cordless trimmer most homeowners on the DEWALT platform should buy. The brushless motor with high and low speed settings, the 13-inch cut swath, and the easy bump-feed line spool work cleanly without the fight that cheap trimmers turn into. Runtime on a 5 Ah pack lands at about 50 minutes in low speed, 30 minutes in high speed.
Frequently asked questions
Is the DEWALT 20V MAX trimmer worth $199 in 2026?+
Yes if you already own DEWALT 20V tools. The shared battery platform makes the bare-tool addition very cost effective, and the cut quality is genuinely good for a 20V trimmer. Without the platform, the [Greenworks 40V](/reviews/greenworks-40v-string-trimmer) trimmer offers a wider 14-inch swath at a lower price.
How long does the DEWALT trimmer run on a 5 Ah pack?+
We measured about 50 minutes in low speed and 30 minutes in high speed at typical residential trimming work. Heavy weed contact dropped runtime by another 5 to 10 percent. Most homeowners use low speed for fence lines and high speed for thick weeds.
DEWALT 20V vs Greenworks 40V string trimmer: which is better?+
The Greenworks 40V has a wider 14-inch cut and lower base price. The DEWALT has a more refined balance, brushless control, and access to the DEWALT 20V tool family. If you already own DEWALT batteries, the DEWALT wins. Otherwise the [Greenworks 40V](/reviews/greenworks-40v-string-trimmer) is a stronger first buy.
Can it edge along sidewalks and driveways?+
Yes. The pivoting head with guide wheel rotates 90 degrees for edging mode. Line wear is faster in edging because of concrete contact, expect to bump-feed more often. We edged about 60 ft of sidewalk on a fresh spool with about 30 percent line remaining.
Riley Cooper
Riley Cooper writes for The Tested Hub.
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