Greenworks 40V String Trimmers: Tool Only, Kits and Combos

Best for
First-time buyers wanting a simple kit

Best for
Small yards needing trim plus cleanup

Best for
Owners who already have 40V batteries

The Greenworks 40V 12-Inch Cordless String Trimmer, model BST4000, is sold as a bare tool with no battery or charger. The listing names compatible Greenworks G-MAX 40V batteries 29472 and 29462 and charger 29482. It has a 12-inch cutting path, .065-inch line with an auto feed head, a variable speed trigger and a front-mounted motor for balance.

The listing gives operating temperatures of 6.8°F to 104°F for the trimmer and 39°F to 113°F for the charger, plus a battery average life of 60 minutes, though runtime always depends on the pack. It lists an item weight of 8.4 pounds and a length of 65 inches. This is for existing Greenworks 40V owners who want a trimmer without buying yet another battery. If you do not own a pack, a kit makes more sense.

• 12-inch cut, .065-inch auto feed line
• Variable speed trigger
• Tool only, fits G-MAX 40V batteries 29472 and 29462

The Greenworks 40V 12 in String Trimmer and blower combo pairs a 12-inch trimmer with a 390 CFM, 110 MPH blower and a 2.0Ah battery. The trimmer uses .065-inch auto feed line, and the listing claims it handles 1-inch weeds, with a 3-year warranty on the head. The blower has cruise control for steady output.

The listing is heavy on marketing and a little inconsistent. It describes an 8 lb balanced design while the spec sheet lists 16.5 pounds, which likely covers the whole combo. It also cites a 67dB start and a 60-minute charge for the battery. We would take the runtime claim of two hours or more with caution, since a single 2.0Ah pack shared between two tools is on the small side. This suits a small yard with a driveway or patio to clear after trimming.

The Greenworks 40V 12 in Cordless String trimmer kit includes a 2.0Ah battery and charger. It has a 12-inch cutting path with 0.065-inch dual line, an auto feed system that advances line without bumping, and a variable speed trigger. Greenworks backs the trimmer and battery with a 3-year limited warranty.

The listing positions it for grass and light weeds around lawns, sidewalks and landscaping, and gives an item weight of 12 pounds, which likely includes packaging or the battery. It is the most straightforward kit here: everything you need in one box, with no extras. If your yard has thick weeds or long fence lines, the 16-inch brushless model will get the job done faster. For heavier duty, our Greenworks 80V weed wacker guide covers the next step up.

Best for
Shaping hedges and shrubs

The Greenworks 40V 24″ Cordless Hedge Trimmer is the odd one out: it cuts hedges, not grass. It is tool only, uses 24-inch dual-action steel blades and has a 1-inch cutting capacity. A 3-sided wrap-around auxiliary handle with a cushioned grip and a rotating rear handle help when cutting the sides and tops of hedges.

It weighs 8.4 pounds and measures 38.58 x 6.79 x 8.26 inches. The listing mentions a 3-year tool and battery warranty, though since this is tool only, you supply the battery. Add this if you already own a 40V string trimmer and have bushes that need shaping. It will not replace a string trimmer for lawn edges.

• 24-inch dual-action steel blades
• 1-inch cutting capacity
• Rotating rear handle, wrap-around front handle

Best for
Bigger yards wanting the fastest finish

The Greenworks 40V 16 in String Trimmer and blower combo is the power pick. The trimmer has a brushless motor, which the listing says gives more power, longer runtime and longer motor life, plus a 16-inch cut path at 6000 rpm. The blower moves 550 CFM at 130 MPH. A 4.0Ah battery is included.

A wider cut means fewer passes, which is the whole point if you want the lawn done quickly. The listing gives a battery average life of 50 minutes and a combined weight of 22.3 pounds for the kit. It also describes the trimmer as attachment-capable. The listing says the Greenworks 40V platform powers over 40 products and can handle up to half an acre with the available batteries. This suits larger yards, long fence lines and anyone who wants the most capable 40V trimmer in this group.

• Brushless motor, 16-inch cut
• 550 CFM / 130 MPH blower
• 4.0Ah battery included

Best for
Trimming and edging with one tool

The Greenworks 40V 13 in Cordless String trimmer is a 2-in-1 trimmer and edger with a steel edging guide. It has a 7-position pivoting head, a telescoping shaft that adjusts from 40 to 52 inches, a 7-position handle, and .065-inch auto feed line. It includes a 2.0Ah battery and charger and runs at 9000 rpm with a 13-inch cut.

The weight is listed several ways: 7.8 lbs in one feature line, 5.18 pounds without battery and 6.9 pounds assembled in the description, and 9.9 pounds in the spec sheet. Expect it to be light to handle regardless. The listing claims 78dB operation and a 3-year tool and 2-year battery warranty, which is a shorter battery term than some others here. This suits someone who wants crisp sidewalk edges without buying a separate edger. For a dedicated tool, see our Greenworks lawn edger guide.