The 40V class offers strong cutting power without the hassles of cords or gas engines. This guide highlights five top 40V string trimmers that balance runtime, versatility, and ease of use for American yards. Each option includes a battery and charger where indicated, and all selections are suitable for trimming lawns, edging sidewalks, and clearing light brush.
| Product | Brand | Main Benefit | |
|---|---|---|---|
| Black+Decker 40V MAX String Trimmer and Edger Kit (LST140C) | BLACK+DECKER | 2-in-1 trimmer and edger with high-torque transmission | Battery and charger included |
| Greenworks 40V 12″ Cordless String Trimmer (2.0Ah) | Greenworks | Compact 12″ cutting path with auto feed and variable speed | Battery and charger included |
| Greenworks 40V Lawn Care Combo (Trimmer & Blower) | Greenworks | Walkway and edging plus leaf cleanup in one kit | 2.0Ah battery & charger included |
| Kobalts 40-Volt Max 15″ Trimmer (Bare Tool) | Kobalts | Adjustable cutting swath for runtime vs. speed | Battery/charger not included |
| BLACK+DECKER 40V Max Leaf Blower & String Trimmer Combo (LCC340C) | BLACK+DECKER | All-in-one outdoor tool combo with automatic feed | Battery and charger included |
Black+Decker 40V MAX String Trimmer and Edger Kit
The Black+Decker LST140C delivers reliable 40V power with a high-torque POWER DRIVE transmission for clean, fast cuts. It converts from trimmer to edger in seconds, offering two tools in one. The battery includes a state-of-charge indicator for planning tasks and the charger uses a simple jack plug design for quick recharging. This model is well-suited for mid-size yards with frequent edging needs and light brush clearing.
Greenworks 40V 12″ Cordless String Trimmer (2.0Ah)
Greenworks’ 40V 12″ trimmer combines compact design with a 12″ cutting path and auto feed head for quick line advancement. A 2.0Ah battery powers the tool, enabling steady performance across standard lawns. The variable speed trigger gives you control to maintain power around shrubs and delicate plants, while the 40V system ensures quiet operation compared to gas models.
Greenworks 40V Lawn Care Combo Kit
The Walkway Warrior combo features a 40V trimmer plus a powerful blower for debris management. The trimmer uses a .065″ auto-feed line to slice through overgrown edges and weeds, supported by a 3-year head warranty. The blower delivers up to 110MPH/390CFM to clear driveways and patios, making this kit a convenient all-around yard maintenance system.
Kobalts 40-Volt Max 15-in Trimmer (Bare Tool)
This bare-tool trimmer is designed for existing Kobalt 40V battery systems. It offers an adjustable cutting swath from 13″ to 15″ to tailor runtime to the job. It does not include a battery or charger, so users can pair it with their existing 40V platform and extend yard coverage without duplicating components.
BLACK+DECKER 40V Max Cordless Leaf Blower and Weed Eater Combo
The LST140 platform returns with an added blower in this combo kit, offering double-duty outdoor care. The trimmer provides Automatic Feed Spool (AFS) for continuous line feeding and a Power Drive high-torque transmission for efficient trimming. The blower contributes to fast cleanup on hard surfaces, completing a versatile yard toolkit.
Buying Guide: Key Purchase Considerations and Comparisons
When selecting a 40V string trimmer, consider the following factors to match your yard needs and maintenance habits:
- Power and cutting width: Look for a model with adequate torque and a swath width that matches your mowing area. Wider swaths speed up big jobs but may weigh more.
- Battery and runtime: Check the included battery capacity (mAh or Ah) and estimated runtime. Larger yards benefit from higher-capacity packs or multiple batteries.
- Edging capability: A 2-in-1 trimmer/edger is convenient if you frequently edge along sidewalks and driveways. A simple conversion mechanism saves time.
- Feed mechanism: Automatic Feed Spool (AFS) helps keep line length ready, reducing interruptions. Manual feeds require more attention during use.
- Ergonomics and weight: Balance and overall weight affect user comfort, especially for extended trimming sessions. Look for adjustable handles and anti-vibration features.
- Terrain and attachments: Sloped landscapes benefit from angled heads or tilting options. Some models offer compatible attachments for blower or tiller tasks.
- Maintenance and warranties: A solid warranty and accessible replacement parts contribute to long-term value. Consider models with straightforward maintenance schedules.
Two-way evaluation often centers on power vs. runtime. For small to medium yards, a 40V trimmer with a 2.0Ah battery provides reliable performance and manageable weight. For larger properties, choose models offering higher-capacity batteries or optional second packs. Cordless convenience is balanced by maintenance considerations such as line feeds, head type, and compatibility with other tools in the same battery ecosystem.