Greenworks G-MAX 40V 12 in. Cordless String Trimmer BST4000 Tool-Only Green for Homeowner Lawn Care
Greenworks G-MAX 40V 12 in. Cordless String Trimmer (Tool-Only), BST4000
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Greenworks G-MAX 40V 12 in. Cordless String Trimmer (Tool-Only), BST4000

110 ratings

Key item features

  • Powerful Performance: Features a high-performance 40V Lithium-Ion battery, delivering fade-free power without memory loss after charging.
  • Efficient Trimming: Offers a 12-inch cut path with a .065 dual line and an auto-feed head for fast and effective weed trimming.
  • Optimal Balance: Designed with a front-mount motor for optimum balance, enhancing ease of use and maneuverability.
  • User-Friendly Operation: Includes a variable speed trigger for on-demand power and an auto-feed head for easy line advancement.
  • System Compatibility: Part of the Greenworks GMAX 40V System, offering a wide range of tools for homeowners.
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Specs

Brand, GreenworksPower type, BatteryRec. use, ResidentialString trimmer type, Walk Behind String TrimmersCutting width, 12 inLine feed, Automatic

About this item

Product details

Greenworks GMAX 40V System offers a wide range of easy to use tools for the homeowner and those who just want more power. This 12-inch cordless string trimmer features an front mount motor for optimum balance. Light weight and easier to use, it has a variable speed trigger for power on demand, 12-inch cut path, .065 line diameter auto feed head for easy line advancement. Designed for ease of use and comfortable operation without the hassle of gas.
  • New Greenworks 40V 12" Straight Shaft Cordless String Trimmer:
  • High Performance 40V Lithium-Ion Battery delivers fade-free power with no memory loss after charging 
  • 12" cut path with .065 dual line with auto feed head to rip through weeds for fast trimming 
  • Compatible Greenworks replacement spool, model 2900719 
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.  

Specifications

Brand

Greenworks

Power type

Battery

Rec. use

Residential

String trimmer type

Walk Behind String Trimmers

Warranty

Warranty information

3 Year Limited Tool Warranty

Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.

Warnings

Customer ratings & reviews

4.3 out of 5 stars
stars
110 ratings41 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars71% (78)
  2. 4 stars10% (11)
  3. 3 stars6% (7)
  4. 2 stars4% (4)
  5. 1 star9% (10)

Reviews summary

Pros

  • : Lightweight unit assembles quickly and clears weeds in one pass.
  • : The trimmer delivers ample runtime on the shared battery.

Neutral

  • : Tool completes full cuts with mower batteries but lasts only ~15 min.
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Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
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Showing 1-3 of 41 reviews

Jul 11, 2026
Reviewer name: Gray2Hairs
5 out of 5 stars
5 out of 5 stars review

Great product but it's not idiot proof, sadly

I've had 2 of these for maybe 4 years. I found one that I thought had a bearing go out. It turns out that the interior frame holding the cutting head was broken. 2 weeks later my second one was also broken. My "helper" didn't listen to how to advance the string and was instead bouncing the head against the ground. I just bought 2 more to replace them (easier than trying to identify parts and fix them myself). These have been amazing at what the can cut and that skinny string is a lot tougher than I expected. Make sure the users understand how to operate these and they might last many, many years.

Review from greenworkstools.com
Helpful?3R3EBKQWFJMF436771882
Oct 11, 2026
Reviewer name: Donna
Item details
Multipack quantity: 1
Sold byGreenworks ToolsDelivered byWalmart
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Happy with purchase. Thank you

Helpful?3R3EBKQWFJMF436771882
Jul 18, 2026
Reviewer name: David
Item details
Multipack quantity: 1
Sold byGreenworks ToolsDelivered byWalmart
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

It was easy to put together to be able to start using it right away. It takes the same battery as my lawn mower and I can do everything I need and still have power left in the battery

Helpful?3R3EBKQWFJMF436771882
Current price is $89.99$89.99/ca
Price when purchased online
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  • Free 90-day returns
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4.5 stars out of 5, based on 1452 seller reviews(4.5)
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