Best 40V String Trimmers for Power, Longevity, and Easy Yard Care
Choosing a 40V string trimmer means balancing battery life, cutting power, and ease of use for a variety of yard tasks. This guide highlights five top options that combine reliable performance with user-friendly features, so you can find a model that fits your lawn care routine. Each selection below includes a brief spec snapshot and key benefits to help you compare at a glance.
| Product | Brand | Battery / Power | Cutting Width | Notable Feature |
|---|---|---|---|---|
| Black+Decker LST140C | BLACK+DECKER | 40V MAX Lithium | 13 inch | 2-in-1 trimmer and edger |
| Greenworks 12″ Cordless | Greenworks | 40V | 12 inch | Auto feed head; variable speed |
| Greenworks 40V Combo Kit | Greenworks | 40V | 12 inch | Includes blower; dual-function system |
| WORX GT3.0 WG163 | WORX | 20V PowerShare (2 batteries) | 12 inch | 2-in-1 with instant line feed |
| Kobalts 40V 15″ Bare Tool | Kobalts | Battery not included | 15 inch | Bare tool for existing battery users |
Black+Decker 40V MAX String Trimmer and Edger Kit
The Black+Decker LST140C combines power with versatility in a 2-in-1 design that converts quickly from trimming to edging. The 40V MAX lithium battery includes a charge indicator, helping users plan tasks without guesswork. A high-torque transmission delivers clean cuts, even through tougher growth, while the included charger simplifies recharging between jobs.
For homeowners who value ease of use, this model emphasizes quick conversions and dependable performance, backed by a known brand. The compact 13-inch cutting width keeps maneuverability high in tight spaces, making it suitable for edging along sidewalks and garden borders. The kit includes battery and charger, reducing additional purchases.
Head-to-head, the 40V power suit helps with normal lawn trimmings and lightweight brush. A durable build with intuitive controls means less time adjusting settings and more time trimming. The price point remains accessible for casual yard care, with a proven track record in small- to mid-sized yards.
Greenworks 40V 12″ Cordless String Trimmer
The Greenworks 40V 12″ trimmer emphasizes compact power with a 12-inch cutting width and a 40V battery. An auto feed line head accelerates line advancement, reducing downtime during edging and trimming sessions. The 12-inch setting is ideal for narrow strips along sidewalks, flower beds, and around edging stones.
With a variable speed trigger, users can adjust cutting force on the fly, enabling slower, precise work around delicate plants and faster trimming on open turf. This model is well-suited for smaller to medium yards where maneuverability and efficient battery use are priorities. It handles typical lawn maintenance tasks without requiring a gas-powered engine.
Temperature and climate resilience are notable; the unit is designed to operate within a wide range of conditions, ensuring dependable performance across seasons. As part of Greenworks’ system, it pairs with other 40V tools for shared batteries, improving overall value for multi-tool households.
Greenworks 40V Lawn Care Combo Kit
The Walkway Warrior Combo from Greenworks pairs a 40V trimmer with a blower, expanding edging and cleanup capabilities for a single tool system. The 12-inch trimmer uses a .065-inch auto-feed line, tuned for quick line replacement and steady cutting power, including through slim spaces along walkways and borders.
A 3-year head warranty on the trimmer helps ensure long-term reliability, while the blower delivers up to 110 MPH and 390 CFM to clear leaves from hard surfaces. The combo is designed for homeowners who want an all-in-one solution that can handle light yard care and debris management in a single pass.
The kit’s battery and charger simplify upgrades within Greenworks’ 40V ecosystem, enabling seamless expansion to additional tools without new investments in power sources. This model is best for those who want a compact system that can also tackle seasonal debris cleanup.
WORX String Trimmer GT3.0 WG163
The WORX GT3.0 WG163 uses a 20V PowerShare system with two batteries, offering flexibility for users who may already own other WORX tools. This trimmer converts quickly to an edger, providing a 2-in-1 function ideal for curb appeal and lawn borders. The instant line feed feature reduces downtime when you need to resume cutting after a line recharge.
Tilting the head up to 90 degrees helps reach tackling tricky edges on slopes or along raised beds, improving accessibility without resorting to manual edging. The compact design emphasizes light, easy handling and is suitable for smaller yards or spaces where power needs align with quieter operation.
While it uses a different battery platform than the other 40V options, PowerShare compatibility allows for cross-tool energy efficiency within the WORX ecosystem, supporting a broader set of yard tasks with fewer batteries overall.
Kobalts 40V 15″ Bare Tool Trimmer
The Kobalts 40-Volt Max 15-inch trimmer is sold as a bare tool, designed for users who already own a compatible battery and charger. The longer 15-inch cutting swath extends trimming reach and runtime, making it suitable for medium- to larger-sized lawns where time savings matter. The adjustable swath supports both tighter and broader cutting patterns for efficient trimming.
Because the battery is not included, this option appeals to those upgrading an existing 40V system or consolidating tools within a single brand family. The tool’s power and adjustable width offer a favorable balance between coverage and control for daily yard maintenance.
Limitations include needing to source a compatible battery and charger separately, which affects upfront cost calculations. For those already using Kobalt 40V gear, this bare tool can deliver integrated performance with minimal extra investments.
Buying Guide: Key Purchase Considerations And Comparisons
Vehicle power vs. weight: Heavier, more powerful models deliver tougher cutting performance but can be tiring to use for long sessions. Consider your yard size and frequency of trimming to balance power with ergonomics.
Battery life and charging: Look for a model with a reliable battery indicator and fast charging. Shared battery ecosystems can lower total ownership costs if you already own other tools from the same brand.
2-in-1 functionality: Trimmer-edger combos save space and add versatility, particularly for homeowners who maintain sidewalks, driveways, and garden borders. Ensure the edging depth is adequate for your needs.
Line feed system: Instant feed or auto-feed heads reduce downtime. Check for compatibility with line type and replacement costs, as some systems require proprietary spools.
Cutting width and durability: A wider cutting swath increases efficiency on open lawns but may slow maneuverability in tight spaces. Durable components and weather resistance improve long-term reliability.
Accessory ecosystem: If you plan to expand with a blower, hedge trimmer, or leaf blower, consider brands offering bundled kits or compatible tools to maximize value and battery sharing capacity.
Maintenance and warranty: Longer warranties signal confidence in build quality. Evaluate customer support quality and replacement part availability for ongoing maintenance.
Cost of ownership: Upfront price should be weighed against battery life, included accessories, and potential need for additional batteries or chargers to minimize downtime during yard work.