Greenworks 40V Dual Trimmer: the best value workhorse
The Greenworks 40V outperformed all single-line competitors at its price point by using two lines simultaneously, which cuts more aggressively in thick grass and extends the time between line advances. The telescoping shaft accommodates a wide range of operator heights -- a practical feature for households where multiple people use the same tool. The flip-to-edge function is secure and tracks straight over extended sidewalk sections.
Check price on Amazon →From lawn edges to overgrown beds, we compared the best cordless electric trimmers to find which models deliver clean, precise results on any trimming task.
How we test
We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.
At a glance
| Pick | Best for | Score | |
|---|---|---|---|
| Greenworks 40V Dual Trimmer: the best value workhorse | Check price | ||
| Black+Decker LSTE525 20V: best lightweight pick | Check price |
The picks, reviewed
Greenworks 40V Dual Trimmer: the best value workhorse
The Greenworks 40V outperformed all single-line competitors at its price point by using two lines simultaneously, which cuts more aggressively in thick grass and extends the time between line advances. The telescoping shaft accommodates a wide range of operator heights -- a practical feature for households where multiple people use the same tool. The flip-to-edge function is secure and tracks straight over extended sidewalk sections.
Black+Decker LSTE525 20V: best lightweight pick
The Black+Decker 20V trimmer is the right choice for light-duty use around established, well-maintained borders. At 5.7 lbs it is significantly lighter than most competitors, making it ideal for users who prioritize ease of use over raw power. The EASYFEED automatic line advance eliminates bump-feed entirely -- line feeds on demand without the user needing to touch the ground. This convenience comes at the cost of cutting power in thick grass, but for a weekly-trimmed lawn it is perfectly adequate.
What to look for
Motor voltage
20V for light, well-maintained grass; 40V for more demanding residential use and occasional weeds; 56V+ for heavy or frequent use.
Line feed system
Automatic feed (Black+Decker EASYFEED) is most convenient. Quality bump-feed works reliably. Manual advance is only acceptable on budget models.
Shaft type
Straight shafts are better for edging and reach under shrubs. Curved shafts are lighter and better for general trimming in open areas.
Telescoping shaft
Essential for households with multiple users of different heights. Fixed shafts cause poor posture and fatigue for operators not at the design height.
Guard and deflector
A full-width guard with line stop prevents line from wrapping around fence posts and prevents debris from flying toward the operator.
FAQs
Dual-line trimmers advance two lines from the head simultaneously, cutting a wider swath and maintaining cutting performance better as lines wear. Single-line models are lighter but cut a narrower path.
Standard string trimmers are for grass and weeds only. For hedge trimming you need a dedicated hedge trimmer with blade attachment. Some brands offer multi-head systems that convert between uses.
0.065-0.080 inch for light residential grass; 0.095 inch for thicker grass and weeds; 0.105 inch+ for heavy brush. Match to your model's specified range.
No oil required. Keep the motor area clear of grass debris, check the line spool for tangles monthly, and store with the battery partially charged during winter.
