Model#: GWKN21302

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Greenworks 21302 40V GMAX Lithium-Ion 13 in. Straight Shaft String Trimmer

  • Greenworks 21302 40V GMAX Lithium-Ion 13 in. Straight Shaft String Trimmer
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  • Due to federal regulations, this product can only be shipped within the continental US. Express delivery not available.


Important Notice: Lithium-Ion Item - Express Delivery option not available due to transportation regulations.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 21302 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 21302 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.
  • This trimmer offers a variable-speed option for maximized power to tackle the toughest weeds in your yard.
  • Automatic 0.65 in. single feed line.
  • Adjustable multi-position cutting path of 10 in. or 13 in.
  • 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.
  • Please Note: 40V G-Max and 40V Lithium-Ion Batteries are not cross compatible; this tool is compatible with the G-Max 2.0 Ah battery (29462) and the G-Max 4.0 Ah battery (29472).
  • 40V G-Max Cordless Lithium-Ion 13 in. String Trimmer - 21302
  • 40V G-Max 2.0 Ah Lithium-Ion
  • 40V G-Max Lithium-Ion Charger
  • Owner's Manual
Compliance and Restrictions
warning: --


Cordless: Yes
Weight: 5.62 lbs.
Batteries Included: 1
Battery Amp Hours: 2.0 Ah
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



4.5 / 5.0
12 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (5)
No, I would not recommend this to a friend (2)
Powerful (9)
Lightweight (5)
Easy To Use (1)
Battery Longevity (if applicable) (1)
Best Uses
Frequent Use (1)
It works great.
Excellent product! We have an acre and a half and this works wonderful.!
June 11, 2019
Originally posted at
This is not your grand dads battery trimmer
I have a number of Green works tools (pole saw, chain saw and blower) and recently added this string trimmer. I am very pleased thus far.
It has plenty of power and on a full charge and runs for as long as I want to work.
My trimmer came with an extra spool, but since it is new I have not needed it, but I thought that was a nice 'value added' item.
July 5, 2018
Originally posted at
Great features and value
Bought this trimmer to work with my Greenworks GMAX mower. Batteries are intechangeable. The trimmer and battery with charger is an exceptional value. Trimmer has power and durability.
June 21, 2018
Originally posted at
Yes, I would recommend this to a friend
Easy To Use
Battery Longevity (if applicable)
Best Uses
Frequent Use
Works as advertised
Works as advertised. Single line trimmer good for trimming home lawns. Comes with two string spools. Trimmer line is small diameter, therefor breaks more often than heavier lines. Heavier trimmer line would be nice.
June 15, 2017
over 2 years ago
Describe Yourself:
Avid Do-it-Yourselfer
Yes, I would recommend this to a friend
Small machine with big results!
Since I got rid of my Craftsman edger, Stihl trimmer and Craftsman lawnmower, this has been the easiest and fastest way I can get the yard done instead of all the heavier equipment that was way too heavy for little me. Now, I can do these things myself without the assistance of anyone.
August 8, 2016
Describe Yourself:
Beginner- Casual Do-it-Yourselfer
No, I would not recommend this to a friend
It's OK
The design of the handle where the trigger is to operate the unit was poorly designed. It puts your arm in a strange position because the battery is mounted upward-facing. If it were designed to be downward facing, it would give you better control of the unit as well as it would make it more comfortable on your arm. Unfortunately, because of the way it was designed to connect to the lower half of the trimmer, you cannot reverse the position of the upper half with the battery.

It is pretty powerful for a battery-operated unit though.
July 25, 2016
Yes, I would recommend this to a friend
Cordless Trimer with a super Battery--just keeps triming!
The best thing about this cordless trimer is the ease of use and the long lasting battery. You don't need to stop frequently to recharge the battery. For a novice like me it is not heavy, the line seems to last a long time so you do not have to change the cartridge often. I can not find anything that is not great. No complaints so far. Just praise.
July 9, 2016
Yes, I would recommend this to a friend
This is a Very Handy and plenty powerful trimmer. It stores conveniently with a built in hole/catch in the handle. It's easy to adjust and use. Mine came with a bad battery but I called greenworks and they shipped a new one fast and with no hassle. Great company, great product
May 10, 2016
Wish I had this years ago!
I have had multitude of trimmers over the years, gas, corded, and even battery operated. None have been as easy to use as this model. It is light enough for my wife to handle and she has grown to use it regularly. I use it when I get it back from her.
July 20, 2015
Incredibly powerful battery trimmer!
This trimmer is easy to set up, easy to use, and more importantly, does the job it is advertised as doing. On a small lot - 1/2 acre - it is perfect for trimming around our gardens, rock walls, green, and shrubs. Even my wife was impressed by its' ease of operation. I may have to order another one just for me.
June 30, 2015

Questions & Answers

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Browse 5 questions Browse 5 questions and 3 answers
how hard to change the string?
A shopper on Mar 30, 2017
Does this product have the same 4 year warranty for the tool and battery?
Michael on Apr 27, 2016
BEST ANSWER: Battery carries a two (2) year warranty against defects in workmanship and materials.
can I use a 40v/4ah battery with this trimmer
ron/retired on Aug 12, 2015
BEST ANSWER: The Greenworks 21302 unit will only accept the 40V GMAX version of their 40v battery.Any ah is compatible, as long as the version is 40v GMAX.
can I use the battery that came with my chain saw ?
ron,retired on Aug 12, 2015
BEST ANSWER: Yes,as long as your chainsaw is a 40 volt G-MAX series tool.
Does this have a brushless motor?
Cindy P on Dec 17, 2016