Model#: GWKN21332

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Greenworks 21332 40V G-MAX Cordless Lithium-Ion 13 in. String Trimmer (Bare Tool)

  • Greenworks 21332 40V G-MAX Cordless Lithium-Ion 13 in. String Trimmer (Bare Tool)
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Become more efficient when working in your yard with the Greenworks 40V G-Max Lithium-Ion Lawn Tool Series, the gas alternative solution you have been waiting on. This interchangeable battery platform offers all the tools you need to complete your yard work without sacrificing performance or power.
Greenwork's 40V Cordless G-Max Lithium-Ion 13 in. String Trimmer delivers the most power and more options in its class making it a strong opponent to its gas powered counterparts. At 9,000 RPM, the 21242 is quieter and will rip through long grass, stubborn weeds and hard to reach areas with ease while lasting 40% longer than its competitors. Designed to work with you, the 21332 telescopic shaft, innovative multiple position swivel head, easy edger converter and variable-speed trigger allow you to rotate and adjust accordingly to each user for enhanced mobility and user experience in order to get the job done faster and more efficiently.
  • Premium power up to 50-min of run time with the G-Max 40V Lithium-Ion 4.0 Ah battery, this trimmer offers a variable-speed option for maximized power to tackle the toughest weeds in your yard
  • Adjustable multi-position cutting path of 10 in. or 13 in.
  • Automatic 0.65 in. single feed line
  • Easy conversion button from trimming to edging and gliding walk behind wheel provide the best result for your yard
  • Flower guard allows you to trim around your flower bed or other hard to reach areas without harm
  • Cushion and over-molded grips increase operator comfort
  • Lock-off switch prevents accidental start ups
  • Note: 40V G-MAX and 40V Lithium-Ion Batteries are not cross compatible
  • 40V G-Max Cordless Lithium-Ion 13 in. String Trimmer (Bare Tool)
  • Bare Tool - Batteries and Charger Sold Separately


Cordless: Yes
Weight: 5.62 lbs.
Batteries Included: Bare Tool
Battery Type: Li-Ion
Cutting Width: 13 in.
Drive Shaft Style: Straight
Drive Shaft Type: Telescoping
Handle Type: Wrap-Around
Line Diameter: 0.065 in.
Line Feed System: Automatic
No-Load Speed (RPM): 0 - 9,000
Speed Settings: 1
Voltage: 40V



4.3 / 5.0
20 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (15)
No, I would not recommend this to a friend (4)
Powerful (11)
Lightweight (7)
Easy To Use (1)
Ergonomic Design (1)
Heavy (1)
Best Uses
Home Repair (1)
Yes, I would recommend this to a friend
Better than gas
1and1/2 acres mostly wooded and I didn't run out of power. Just pick it up and go, works great!
July 15, 2013
Yes, I would recommend this to a friend
Good tool
Great service and fit my demand for performance at very good price
May 12, 2016
No, I would not recommend this to a friend
Starts every time!
It's a little early to judge but the unit seems very heavy compared to otheres and is poorly balanced. The adjustments don't really give much choice. I also have a blower which is great and the main reason that I bought this trimmer.It shares the same battery. It has very good lasting power, I ran it for over 30 minutes and it was still going strong. It was very difficult to stear while edging a curb but I'm hoping to get better with practice. The biggest problem is the line cartridge from the factory. It mostly refuses to release so you have to constantly stop and pull it out. The line is very poor quality and wears down immediately. It was wound so tightly I had a hard time pulling it out by hand. It really is a powerful unit, I hope that we will get used to each other.
June 28, 2015
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Battery Longevity (if applicable)
Best Uses
Home Repair
Pleased with my purchase!!!!
Battery is very powerful and lasts a long time compared to other battery operated tools I have. It works so well one has to be careful not to eat up something that should be left alone. I have other Greenworks tool (blower and hedge trimmer) that I can share the battery with. They all work great.
October 11, 2016
1 month ago
Describe Yourself:
Beginner- Casual Do-it-Yourselfer
First time user.
I bought the 22272 G-MAX 40V 20-Inch Cordless Pole Hedge Trimmer for a mountainous overgrowth from my neighbors yard. I was surprised at the job it did and ease of use. I then bought the 21332 G-MAX 40V 13-Inch Cordless String trimmer/edger. It does a great job with less hassle, I have corded and gas trimmers which are a lot more labor intensive than Cordless.Having several hundred feet of chain link fence I have used miles of string in the 40 plus years of trimming. Utilizing the edger wheels in the trim position and rolling them along the fence I had very few string snaps. I liked these two so I also bought the 24282 G-MAX 40V 150 MPH Variable Speed Cordless Blower, it was smaller than I thought it was going to be but ended up a plus since my wife can easily use it for the deck and walks. I have corded and back-pack blowers but again find this a handy addition. I cannot rate durability yet since I purchased them this month but with a 4 year warranty GreenWorks seems to feel strongly about that.
August 24, 2016
Originally posted at Greenworks
Yes, I would recommend this to a friend
We have a 1 1/2 yard property and combined with a total of 3 batteries this tool gets the job done in in one round of charges. The string it comes with can't withstand the power of the tools. I replaced with a thicker one I had from a gas weeder and it works like a charm chopping down even thick weeds. The power of this tool is really comparable to the one of gas weeders with the plus of being eco friendly and zero maintenance. Highly recommended
May 5, 2014
Yes, I would recommend this to a friend
A great addition to my other 40V cordless products purchased from CPO. Great to use and great place to shop.
October 8, 2014
Yes, I would recommend this to a friend
Just as expected great product
This trimmer is powerful enough to edge perfectly and very easy to trim around trees, fences, rocks etc. another great Eco friendly product from greenworks

Love these products!
October 27, 2014
Yes, I would recommend this to a friend
Weed trimmer
The product was as described, assembled with ease and was ready to use since I already had a battery for it. It did a great job with the weeds and growth left from las t season
I have no cons about it it since I have not got a lot of use out of it to date
March 27, 2015
Yes, I would recommend this to a friend
Best Battery Powered String Trimmer I have ever uesd
This is my third battery powered string trimmer and by far the best of them all! has good power, battery charge holds great. If I ever need another one if this is still available it's what I will get.
June 7, 2015

Questions & Answers

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Browse 9 questions Browse 9 questions and 15 answers
How do you advance the string on this trimmer?
Ann on Aug 21, 2016
BEST ANSWER: Every time you start it, it automatically advances the string ¼" of an inch. If your string is too short because you hit something that broke it off close to the hub, you have to start and stop the machine multiple times to advance the string.
Is this new or reconditioned?
Dick on Sep 22, 2014
BEST ANSWER: This is a new item.
What size or name for string in this weedeater
Me on Jun 8, 2016
BEST ANSWER: Model number for replacement spool and string is GWKN29252
Where can I find replacement "lines" for this model?
linda on Feb 16, 2016
BEST ANSWER: Greenworks 29092 .065 in. Single Line Replacement Trimmer Line
Does this unit operate with both the 2AH &4AH 40v Gmax batteries. I have the 2AH Gmax can I use it with this model
conjureman on Oct 13, 2015
BEST ANSWER: Yes, the 2ah battery is compatible with model 21332
Is there a trimmer that will work with the REGULAR 40V battery I have for my blower?
AP on Mar 27, 2015
BEST ANSWER: The only 40 volt trimmers that CPO handles is the 40v G-MAX trimmers.
If I have the G-max 40V batteries for my Greenworks lawnmower, I can use them with this tool?
KellyE on Jan 23, 2015
BEST ANSWER: Yes, as long as the battery is 40v and Gmax.
is it true that the greenworks g-max trimmer 40 v battery is not interchangeable with other greenworks 40 v battery products?
Bob on Jul 21, 2013
BEST ANSWER: Yes, these two batteries are not interchangeable. A GMax tool must use a GMax battery. Also, same for the regular Greenworks 40V battery.
?how long is the telescopic shaft
A shopper on Oct 24, 2016