Model#: GWKN25302

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Greenworks 25302 40V G-MAX Li-Ion 20 in. 2-in-1 Twin Force Lawn Mower

  • Greenworks 25302 40V G-MAX Li-Ion 20 in. 2-in-1 Twin Force Lawn Mower
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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.
Greenworks 40V G-Max Twin Force Lawn Mower delivers all the power you need to get your yard looking pristine without the hassle of spilling gas or extension cords. The simple electric start makes this easy-to-use, avoid those hard to manage pull gas cords and take that step towards a Zero Carbon Footprint in the yard. This 2-in-1 mower features several high performance features including tool-less conversion from bagging to mulching to make your job faster, and is designed with the new Twin Force dual blade cutting action for enhanced cutting performance. The 5-position cutting height adjustment allows you to switch between a range of 7/8 in. to 2-3/4 in, guaranteeing a nice even cut for all grass types. Greenworks ergonomic design offers a variety of user comfort features from easy adjustable handle, overmolded grip, 7 in. rear wheels and 6 in. front wheels for better control and easy fold down handles for convenient storage. Quiet and easy to use, this mower provides the reliable performance and dependability you need to get your yard work done quickly and efficiently.
  • 20 in. cutting deck offers a balance of maneuverability and cutting capacity making it ideal for mid-sized areas
  • Innovative Smart Cut technology adjust for power or runtime based on the thickness of your grass
  • Dual blades offer better cut quality, superior mulching and bagging capabilities
  • 5 position single lever height adjuster allows for a cutting height range of 1-3/4 in. to 3-3/8 in.
  • 2-in-1 feature offer versatile use with mulching and rear bagging capabilities
  • Hard top rear bag indicates when the bag is full and needs to be emptied
  • 10 in. rear wheels and 7 in. front wheels make it easy to maneuver through any range of terrain
  • Compatible with Greenworks G-MAX 40V Li-Ion System that powers more than 25 tools
  • 40V G-Max Cordless Lithium-Ion 20 in. 2-in-1 Twin Force Lawn Mower - 25302
  • (2) 40V (2Ah and 4Ah) Lithium-Ion Batteries
  • Charger
  • Owner's Manual
Compliance and Restrictions
warning: Cancer and Reproductive Harm --


Series: G-MAX
Cordless: Yes
Weight: 42.5 lbs.
Amp Hour: 2 Ah / 4 Ah
Batteries Included: 2
Battery Type: Li-Ion
Bluetooth Compatibility: No
CSA Safety: Yes
Case Included: No
Charge Time: 3 Hours
Charger Included: Yes
Cutting Height (Max.): 3.63 in
Cutting Height (Min.): 1.63 in
Cutting Height Settings: 5
Cutting Path: 20 in
Deck Material: ABS Polymer
Discharge Settings: Rear
Drive System: Manual
Motor Type: Brushed
Mulching Capability: Yes
Powered Tool Power Source: Electric-Cordless
Speed Controls: No
Starter Type: Recoil
Voltage: 40V
Wheel Size (Front): 8 in
Wheel Size (Rear): 10 in
Wifi compatibility: No



4.5 / 5.0
104 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (40)
No, I would not recommend this to a friend (1)
Lightweight (39)
Easy To Use (8)
Ergonomic Design (6)
Powerful (6)
Short Run Time (if applicable) (1)
Best Uses
Frequent Use (5)
Small Projects (4)
Heavy Duty Requirements (1)
Large Projects (1)
Motor stripped out.
Battery's last about 27 minutes in a real lawn. Motor stripped out two months after warranty ran out. Doesn't do well in ankle high grass. replacement parts are all out of stock.... So it worked well enough while it lasted, but it didn't impress me.
July 13, 2019
Originally posted at
Great For Small Yards
Like the other reviewers, this mower works best with a small yard and dry grass. When the grass is wet, the mower doesn't have enough power to push the heavier grass into the bag.

The only other issue I have is that the bag base is supple, which means it bends. Thus, the grass has a more difficult time getting into the grass entrance to the bag. That seems to be the issue with grass building up in the chute.

Other than that, the operation is smooth. We purchased a second 40v battery, and using two 40v's, it cuts our entire lawn.

We haven't tried the mulching feature yet but are planning to do so this summer.

For the money, this is a great little mower. No gas or oil hassles, plenty of power. Very light weight.
July 1, 2019
Originally posted at
4 years and going strong
Tired of expensive tuneups and smelling like gas i bought this 4 years ago. I love it!
I have approximately 3,000 sq feet of grass and it cuts it well. Quieter than a vacuum cleaner, no maintenance or obnoxious odors, i would definitely recommend this to anyone who needs a lawnmower.
June 29, 2019
Originally posted at
great battery life
was able to mow my 1/4 acre lot twice on same charge. mows great. not impressed with bagger yard has incline and with full bag of grass it was hard to push,. only using mulcher.. does great job.
June 26, 2019
Originally posted at
Best mower ever
I bought this 3 days ago. Light weight easy to push. Cushioned handlebar. Twin blades cut tall wet grass without a problem.
June 19, 2019
Originally posted at
Fantastic Lite Weight Mower.
I bought my first mower 5 years ago and love it. As I have gotten older, I decided to buy a second mower so both my wife and I could mow you yard in half the time (it gets hot in South Texas). My only recommendation is to purchase more 4AH batteries, so that you have plently juice is you should let the yard get away from you.
June 8, 2019
Originally posted at
Powerful and quiet Mower
Mower Has lots of power bagger works great the mulcher isn't the best one of my only complaints. Also the foam handle fell apart right after getting it. I replaced it with a wrap from a bat. I have no issues with the batteries or the charger I can mow my whole yard 3 times before I need to charge the batteries. "Have an Average size yard"
June 4, 2019
Originally posted at
complete satisfaction with 20-inch twin force mowe
I decided that after part way into my 9th season using my G-Max Twin Force mower that it deserved a review. Both the batteries and mower are still going strong and have not had any problems. Over 8 seasons use gives a far more meaningful review. I am 66 years old and really appreciate how light weight and maneuverable it is. No need for steel decks or self propulsion. Living in western Washington state I don't and pretty much can't wait for dry grass, yet the mower does as well as any comparably priced gasoline mower. When amortizing the purchase price over 9 seasons it works out less than $50 per year. With no costs for gasoline, air filters, oil, spark plugs, carburetor rebuilds, or having to deal with hard starting engines it's a no brainer for me.
May 22, 2019
Originally posted at
Love this mower!
I received this mower as a gift from my Father in Law and absolutely love it! I was skeptical at first about a battery powered mower, but it gets the job done. No messy gas, etc. It's perfect for my small yard. Had one part broke but the customer service is great and they shipped me a new part for free and I was out of warranty!
May 22, 2019
Originally posted at
Might not be rugged enough for us...
We've used this twin force mower for several years now. The mounting on Blade #1 has not been able to stand up to our use. I've jerry rigged the mount with extra washers but it seems to come loose again after several uses. I'm very pleased overall with the mower and with its lightness and the charge on the batteries but I'm wondering about the blade mounting system. I take the blades off and sharpen them every year and have noted the deterioration of the mounting on blade #1. The plastic jig that is supposed to hold the blade in place is giving up the ghost and continually re-tightening and getting washers placed so the blade stays in place is getting frustrating. The mounting system on blade #2 is also starting to show some problems as well.
May 6, 2019
Originally posted at

Questions & Answers

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Browse 27 questions Browse 27 questions and 43 answers
What is the mow time with 2 fully charged 40V G-Max batteries?
SundayDriver on Jun 7, 2015
BEST ANSWER: This mower has a run time of 1 hour 20 minutes with two fully charged batteries.
The web page contradicts itself regarding the cutting height range of this mower. Please clarify the minimum and maximum height of cut. Thank you.
Will on Mar 7, 2015
BEST ANSWER: This unit features 5 position single lever height adjuster allows for a cutting height range of 1-3/8" to 3-3/8".
I have a lawn care business. I'm thinking about "going green". Will this mower be able to hold up doing multiple yards a day, 5 days a week?
Michael on Jul 27, 2016
I would not recommend this mower for that worklaod...
Here in Rochester NY there is a company called CARBON CUTTERS...You may
want to network with them regarding the equipment they use...
Take care...
Are the mowers self propelled??
A shopper on Apr 18, 2017
BEST ANSWER: No, Batteries are not yet at the state of development where they would last very long doing the mowing and self propelling. On a flat lawn, the mowers are so light that they do not need self propelling.
I have a battery that reads green (fully charged) in the charger. The battery reads blinking red in the mower and mower won't start. Why do two Greenworks products read the battery differently?
Teresa on Aug 18, 2016
BEST ANSWER: Please contact Greenworks direct for tech support. You can reach them at 888-909-6757
I'm trying to remove the blades for sharpening. One came off easily but the other nut appears to be stuck. Nothing will budge it. Any suggestions?
Tree top on Jul 19, 2016
BEST ANSWER: No I do not...Purchased recently and have used twice...
? For you...Has the cutting been uniform...???...
Good luck...
Can the mower be stored vertically?
Curious mower on Jul 13, 2016
BEST ANSWER: I don't see why not. There is no oil in it to leak out. You would have to rig some kind of mount for it as there isn't a hanging hole or anything.
What can I do if it won't start? Batteries are fully charged and the center connecter fully engaged. I push the button and pull the handle - nothing.
Gary on Jun 4, 2016
BEST ANSWER: Just a couple of thoughts in reply to your question. First, you say that the batteries are fully engaged. If you did not hear a positive "click" when you inserted each battery, they are not properly installed. If you can pull either battery out of its slide receptacle without pressing the grey release lever, it's not locked in place. Slide the battery most of the way out of its track, then slide it back toward the connector with enough authority so that you hear the locking mechanism click into place.
To start the mower, push and hold the safety button down while you pull the handle. When the motors start, release the button.
Hope this helps.
I am considering purchasing the 40V G-MAX Twin Force Mower, however I noticed a claim that the Twin Blades may leave portions of uncut grass (between the blades). Is this common to those who have this mower? This would surely change my decision to purchase this product. THX
Ice on May 8, 2016
BEST ANSWER: The mower cuts evenly and does an excellent job mulching cut grass, even when the grass is tall and thick.
Sent from my iPhone
Where is the serial number located on the mower?
Larry on Aug 20, 2016
BEST ANSWER: On the hard plastic flap that cover the top opening of the grass catcher, on the upper right hand side when reading the text. You will see "Model Number," and under that "G-MAX," and under that "S/N."
Sent from my Verizon, Samsung Galaxy smartphone


Greenworks Warranty


When looking for lawn tools, we know you’re thinking about quality. You’re looking for something that will get the job done and get you back to your weekend. That’s why Greenworks backs tools with a four-year warranty (1 year on Pressure Washers) we know our products will perform at the highest level and always be reliable.


Greenworks products are protected against all defects under normal use for a period of four years (90 days for commercial use) from the shipping date. Pressure Washers carry a 1 year warranty.

Reconditioned GreenWorks products are protected against all defects under normal use for a period of 30 Days from the shipping date.

Greenworks can opt to repair, replace or issue a refund for products that are determined to be defective, or that have been damaged during shipping. Proof of purchase is required. Replacement of products or parts subject to normal wear and tear is the responsibility of the customer. If Greenworks accepts a return under Warranty, you can return the defective or damaged product only after you call and receive a Return Authorization from Greenworks. You also will receive a refund for your original shipping charges, and GreenWorks will arrange and pay for your return shipping charges. Lithium-ion batteries carry a two-year warranty against defects in workmanship and materials. Sealed Lead Acid batteries carry a one-year warranty against defects in workmanship and materials. Batteries must be charged in accordance with the operator’s manuals directions and regulations in order to be valid. See owners manual for warranty details.