Greenworks 12-Inch 40V Cordless String Trimmer

Greenworks 12-Inch 40V Cordless String Trimmer is lightweight and ergonomically designed, dual spool trimmer, with variable speed.

Greenworks 12-Inch 40V Cordless String Trimmer is powered using single Greenworks' 40V G-MAX lithium ion battery, providing excellent range of motion and cutting capabilities, helping any gardener to keep his garden or yard neat and tidy.

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Greenworks Cordless String Trimmer Features and Specifications

Like most cordless tools, Greenworks 12-Inch 40V Cordless String Trimmer can be purchased as 'bare tool' or as trimmer+battery+charger.

Generally, 2 Ah 40V G-MAX lithium ion battery and charger are recommended for this cordless trimmer.

With 2 Ah battery, trimmer weighs only 7.87 pounds (~3.57 kg) and can operate up to 30 minutes on a single battery (2.0 Ah) charge.

If the grass is higher and thicker, and the trigger must be fully squeezed more often, operating time is shorter - unit doesn't feature brushless motor, but it is strong for 12" trimmer and rather efficient. Of course, brushless motors are even more efficient, but such motors also increase the price of such tools.

Note: Greenworks manufactures broad range of various tools that is powered with G-MAX 40V batteries and if you already own such battery or batteries, purchasing other tools as 'bare tools' can be rather cheap and cost effective. Also, Greenworks 12-Inch 40V Cordless String Trimmer is rather simple to use and maintain trimmer, but just in case, prior assembling the unit, be sure to thoroughly read the manual.

Standard battery charger can fully recharge the battery in ~1 hour, allowing the user almost constant operation using 2x2Ah batteries.

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G-MAX 40V lithium ion batteries come in various sizes/capacities, and the larger the battery, the longer operating time on a single battery charge.

G-MAX 40V lithium ion batteries feature battery charge indicator in the form of 4 lights:

- 4 green lights: battery fully charged,

- 3 green lights: battery is at 75% capacity,

- 2 green lights: battery is at 50% capacity,

- 1 green light: battery is at 25% capacity,

- lights are out when the battery capacity indicator button is pressed: battery charge is at 10% or less and should be recharged.


Trimmer head is fixed and can't be rotated in different positions - edging could be little bit problematic, but this is lightweight trimmer and it is up to the user to rotate the whole tool for such tasks.

greenworks g max 12 inch 40v 3Greenworks 12-Inch 40V Cordless String Trimmer features dual trimming line with the line auto-feed.

Unit also features option for manual line feed, allowing the user to set the line to required length.

Greenworks 12-Inch 40V Cordless String Trimmer uses 0.065 inch (1.65 mm) diameter trimmer line - using other similar wires, ropes, strings and similar lines is forbidden!

Spent line can be replaced using pre-wound spools or by using two 10 feet (~3.05 m) trimmer lines.

Again, for exact maintenance procedures, check the manual.

Cutting width is 12 inches (~30.5 cm), and in combination with edge guide, allows the user to trim the grass very accurately.

Unit also features rear guard for safety purposes and adjustable auxiliary handle for easier handling.

Speed is variable and it is up to the user to hold the trigger all the time.

Note: Greenworks 12-Inch 40V Cordless String Trimmer also features 'lock-out button' that prevents accidental starting!

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Unit comes with 4-year limited warranty on the bare tool and 2-year limited warranty on the batteries.


greenworks g max 12 inch 40v mLong Story Short: Greenworks 12-Inch 40V Cordless String Trimmer is excellent and affordable cordless trimmer that it gets its job done. Nonetheless, even such unit can be improved by using for example, brushless motor, adding shoulder straps and similar.

If you are looking for a good cordless trimmer, that is highly maneuverable and accurate, consider this model. If you don't have Greenworks G-MAX 40V batteries, order model with the charger and 2.0 Ah battery - Greenworks offer more than 25 different cordless tools that can be powered with such batteries and additional tools can be purchased for cheap.

For more reviews and recommendations, check Greenworks 12-Inch 40V Cordless String Trimmer Amazon link (link opens in the new window).