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: --


Series: G-MAX
Cordless: Yes
Weight: 42.5 lbs.
Batteries Included: 2
Battery Type: Li-Ion
Cutting Height (Max.): 3-5/8 in.
Cutting Height (Min.): 1-5/8 in.
Cutting Height Settings: 5
Cutting Path: 20 in.
Deck Material: ABS Polymer
Discharge Settings: Rear
Drive System: Manual
Mulching Capability: Yes
Recharge Time (Full Capacity): 3 hrs.
Voltage: 40V
Wheel Size (Front): 8 in.
Wheel Size (Rear): 10 in.



4.5 / 5.0
93 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)
Very good for two years then watch be aware
One of the motors locked up and stopped working. I will try to order a replacement part - but doubt most of you guys want to deal with that in two years.
January 27, 2019
Originally posted at
6 years now
We bought this mower about 6 years ago. It has performed well with very few issues. The first problem was that the starter handle broke internally and I had to open it and jury rig it.
October 28, 2018
Originally posted at
Vroom! Vroom!
PORT ANGELES, Wash. — If I had to have a lawnmower, I’m glad I chose the G-Max Twin Force.

I’d done without one for years, living in a house whose yard was a ravine But now I had a house with front, back and side yards. And as thoroughly overrun by cat’s ear weeds as they are, they still needed to be cut.

I’d learned that lithium battery-powered mowers could cut as well as gas machines. And my local hardware store — citing the performance of its 40-volt chainsaw — recommended Greenworks.

My wife would be delighted that no longer need I haul home cans of gas that, no matter how tightly I capped them, still filled our car with fumes that clogged her throat. And I wouldn’t mind the pro-environment switch. Or the relative quiet.

So long as the batteries could finish the whole job in a day.

That turned out to be no problem. The Twin Force came with one 4ah and one 2ah battery, one for each of its two ports. When one was spent, the other kicked in with a spirited growl from the motor and from an indicator light. While I usually kept on mowing, it was easy enough to pop out the first battery and place it on the charger.

(The batteries needn’t be drained to be recharged, and they needn’t be fully charged to be used A gauge on the battery case indicated how much charge it retains.)

Through three summers, the mower has done almost all I’ve asked, even attacking that early spring grass that’s grown long from a wet, mild Northwest winter. It would cut, bag the cuttings if I wanted, or mulch them if I didn’t. That usually was the case after that first mowing of the season.

The bag and mulch plug popped easily in and out. I especially liked the toggle tighteners where the handles could fold, eliminating repeated tightening of the bolts. And the twin blades proved easy to remove, sharpen, and replace.

Looking at Greenworks’ full mower lineup, I want an excuse to move up to a mower that looks even more like a race car than my Twin Force, but it works too well.

Vroom, vroom! Welcome to my fantasy life among the cat’s ears.
August 23, 2018
Originally posted at
Worthy combustion replacement
I have been using battery operated lawn mowers for almost 20 years. The Greenworks Twin Force is finally a mower that provides more than enough cutting power for a long duration. I mow about a 1/4 acre of lawn and only occasionally has the mower switched over to the 2nd battery. Mulching is good and what I do most of the time. Usually go over it twice if I let it get to long. I also love the automatic power gear. If the load becomes heavy, the mower switches to a high power mode for as long as needed. The only thing that could work better is bag. If the grass has gotten at all long or is slightly damp, the entrance to the bag tends to clog up. Not a huge deal and would totally recommend this mower.
August 21, 2018
Originally posted at
Just what I had been looking for
After down sizing I no longer needed a gas mower. This fills all my needs and is maintenance free. The batteries have lasted 3 years which was my greatest concern. When I need to replace it will be with another battery mower.
August 21, 2018
Originally posted at
Very convenient
I purchase the mower at the beginning of this mowing season. It replaces a full powered Honda Gas mower which cost roughly three times the price. This mower starts all the time every time. It is so convenient and lightweight it makes little difference that it is not self-propelled. No messing with gas and oil or needing to go to the gas station to pick up gas in the middle of mowing. It is all around a great mower for a standdard size yard.
August 20, 2018
Originally posted at
Excellent Mower
I have used this mower for several years now. It is lightweight and easy to maneuver. The cut is pretty good - if you want a really sharp cut you will need to go over it twice. Not a big deal to me since I had to do the same using my gas powered mower.
August 20, 2018
Originally posted at
great lightweight mower for smaller lawns
This is a great lightweight mower for smaller yards and city yards. It can do a lot more if you have at least 1 more battery which id recommend. I use dual 4s in mine and it can mow through some pretty high stuff when it spins up the juice. My only gripe is that the button to activate the lever does wear down a little over time and i have had to fix it twice manually. Its not hard though, just unscrew it and re-seat the wire and screw it back on.. Have a buddy help. Other than that this mower is solid though.

I wish it came apart easier though.
August 20, 2018
Originally posted at
I like the mower. I think.
Purchased this mower from Amazon on April 24, 2014 on promo and I've really liked it until recently. Lightweight, relatively quiet, no gas, no oil, no smelling like gas and oil, and cut well. Plus the twin blades were just cool. I became an instant fan

However mid-June of this year (2018), the original batteries quit. Both failing at the same time was odd enough that I spoke with Greenworks about whether it was the batteries or the charger. They were unable to offer any advice on how to make the determination and I took the less expensive path, purchasing a charger ($24). Same problem. So I bit the bullet and purchased a battery.

The new battery charged on original and new chargers, the old batteries do not on either charger. All is well again for two months, when yesterday the mower almost started, immediately quit, gave smoke from gaps in the housing, and had the lovely fried electronics ozone smell. It continued to stink of fried electronics a couple of hours later. I have not disassembled to see exactly what happened. It does make me wonder again about both of the original batteries failing simultaneously.

I removed the battery while the mower was still smoking, noted it was not hot, and put it briefly into a charger to test. The charger thinks the battery is fine.

This leaves me in a quandary. I'm hooked on cordless mowers. And I certainly liked the GW 25302 until this happened. Do I purchase another just like it? Purchase a different GW model such as the MO40L2512, which is coincidentally on sale today as an Amazon Deal of the Day (weighs 20# more, better bag options, single blade, uses the same battery)? Switch brands altogether?
August 20, 2018
Originally posted at
Very convenient
I purchase the mower at the beginning of this mowing season. It replaces a full powered Honda Gas mower which cost roughly three times the price. This mower starts all the time every time. It is so convenient and lightweight it makes little difference that it is not self-propelled. No messing with gas and oil or needing to go to the gas station to pick up gas in the middle of mowing. It is all around a great mower for a standdard size yard.
August 20, 2018
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.