GreenWorks ST40B410 G-MAX 40V 12-Inch Cordless String Trimmer, 4Ah Battery and Charger Included Review

GreenWorks ST40B410 G-MAX 40V 12-Inch Cordless String Trimmer

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With the number of cordless weed eaters increasing every day, it is difficult to know the best product to buy. Some products like the GreenWorks ST40B410 tout their adjustability, usability and light weight features, while others claim great battery life. If you want a powerful 40-volt cordless string trimmer, then read on and find out whether this power tool from GreenWorks is worth considering.

Since there is also another version of this cordless weed eater that has a 2Ah battery, it can be tough to figure out which one is most suitable. However, you should know that the cheaper version with only 2Ah battery would have a significantly limited performance as compared to the 4Ah version.

In fact, due to the increasing demanding nature in which string trimmers are being used nowadays, the complete GreenWorks ST40B410 kit with a 4Ah battery is more useful.

This GreenWorks string trimmer uses an efficient brushless motor that allows the batteries to power the tool harder and longer, without the risk of overheating. Setting up the unit and doing significant amounts of edging and trimming is also very easy thanks to the general ease of use. Read on for an in depth review of this cordless weed eater.


Greenworks 12-Inch 40V G-MAX Cordless String Trimmer, 4Ah Battery and Charger Included ST40B410

  • Flexible speed trigger
  • 12 inch dual cutting line with auto-feed
  • 4Ah battery included along with a charger
  • Quick charging battery
  • Fast working brushless motor
  • Lightweight
  • Dimensions: 11.75 x 7.5 x 64.5 inches
  • Weight: 8.8 pounds


  • Rotating head feature means that it can be used for edging
  • Runs very quietly and does not produce harmful emissions
  • Battery charges quickly and retains charge quite well even when doing intensive maintenance tasks
  • Cruise control and flexible speed trigger improve control
  • Lightweight build reduces strain when using for an extended time
  • Brushless motor makes easy and quick work of any weeds
  • The auto feed line makes cutting stress-free


  • The fixed shaft length means that it will fit awkwardly for shorter people
  • The included string usually needs replacement after a while


The GreenWorks 12 inch diameter head delivers an adequate wide path when cutting grass and it also excels in edging tasks when used sideways. Actually, this is the best size for regular residential use. Many users found the self-feeding dual line to be also very helpful while performing their cutting work.

While the GreenWorks ST40B410 G-MAX 40V 12-Inch Cordless String Trimmer does not come pre-assembled, the setup process is quite straightforward. The included product manual is well illustrated and it offers easy to follow instructions so that you set up the machine very quickly. Once assembled, this trimmer feels sturdy and well balanced.

How long the battery lasts is a major concern for anyone looking to buy a cordless trimmer. For this particular 4Ah model, you can expect up to 90 minutes run time of continuous usage. This time is enough to cover any grass cutting or edge trimmings around the property. It is also good to note that the 2Ah battery pack will only last around 30 minutes.

With regards to performance, not all cordless trimmers produce great results and that makes it more essential to find the best model. As manufacturers continue innovating and developing their products in this market segment, cordless string trimmers are now offering nearly equal or more power than their gas counterparts. GreenWorks has done a really good job with this ST40B410 G-MAX 40V 12-Inch Cordless String Trimmer based on the numerous positive reviews it continues to receive.

Weighing only 8.8 pounds, this GreenWorks GMAX ST40B410 is light on the hands and can even be used by older people without creating unnecessary strain. The controls are well placed within reach and this makes operating it a breeze. It’s a front-mounted unit that distributes weight naturally across the device, thus delivering a more ergonomic feel.

If you have been wondering whether these cordless trimmers will be able to replace their gas counterparts, then you should know that in some cases they are actually better. In this regard, this GreenWorks ST40B410 G-MAX 40V 12-Inch Cordless String Trimmer is one of the best possible gas powered replacements you can buy. For homeowners looking to take care of their own back yard in a professional way, this GreenWorks trimmer is worth the investment.


For extra value, you can also get the GreenWorks STBA40B210 G-MAX 40V Cordless String Trimmer and Blower Combo Pack.  This will give you more than 40 minutes run time on the 2Ah trimmer as well as the convenience of the included blower. Despite the similarities in ease of usage and minimal noise, the GreenWorks ST40B410 G-MAX 40V beats its counterpart since it can sustain more than 90 minutes cutting time.

Professional landscapers who want more power can consider getting the ECHO CST-58VBT 58-Volt Lithium-Ion Brushless Cordless String Trimmer.

While the charger and battery are not included in this particular ECHO kit, unlike the GreenWorks ST40B410 G-MAX, it does perform much better since it uses a brushless motor. This means you get both superior power and better run time. It also comes with a high and low speed trigger for extending the run time or increasing the power.


In conclusion, the GreenWorks ST40B410 G-MAX 40V 12-Inch Cordless String Trimmer, 4Ah Battery and Charger Included is the ideal trimmer for residential applications. It has just enough power and run time to handle all your usual edging and cutting tasks. The automatic line feed and 12 inch cutting swath helps it handle thick grass without any issues.

Many users loved the fact that it was light enough for improved control, especially when edging. It has a more natural handling feel and even older people can use it with no concerns about straining. GreenWorks has made a great job in creating a capable and powerful trimmer.

If you look past the disadvantage of replacing the string regularly, then you will discover that this GreenWorks ST40B410 cordless string trimmer is a reliable power tool.

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