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GreenWorks 25302

G-MAX 20" 40V Cordless Twin Force

G-MAX 20" 40V Cordless Twin Force Mower, (2) Batteries, Charger
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  • Features & Benefits
  • Specification
  • Media
  • Reviews
  • Manuals

The Figures At-A-Glance

40 Volt G-MAX20inch Cutting Deck2-in-15 Cutting HeightsAutomatic battery switchover

What Model Options do I have for this tool?

Model 25302 : G-MAX 40V 20" TwinForce Mower
What's in the Box? G-MAX 40V 20" Twin Force Mower : Rear Discharge Bag : Mulch Plug :  4Ah Battery : 2Ah Battery : Charger : Owner's Manual

Features & Benefits

  • Powerful G-MAX 40V Li-Ion Systems delivers greater efficiency with up to 70 minutes of run time with included batteries
  • 20-Inch cutting deck offers a great 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
  • Automatic battery switchover pulls power from the second battery once the first is depleted to eliminate downtime
  • 5 position single lever height adjuster allows for a cutting height range of 1-3/4" to 3-3/8"
  • 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 
  • Easy Fold System for storage or compact transportation
  • 10" rear wheels and 7" front wheels make it easy to maneuver through any range of terrain
  • Includes two 40V batteries and a charger
  • Use with (2) G-MAX 40V 4 AH Li-Ion battery for up to 90 minutes of runtime
  • Compatible Only with GreenWorks G-MAX 40V Battery Models 29462, 29472 and Charger 29482
Product Includes
Twin Force Mower : G-MAX 40V 4Ah Battery : G-MAX 40V 2Ah Battery : Charger : Rear Discharge Bag : Mulch Plug : Saftey Key: Owner's Manual
Cutting Deck Width 
20 inches
Height Adjustment :
5 position, single lever
Self Propelled Motor
Mulch Ready :
Bag/Discharge :
Rear bag discharge
Deck Material
Low Density Polyethylene
Housing Material
Handle Material
Foam Padded
42.5 lbs
Compatible Battery
G-Max 40V 4Ah- Model: 29472 & G-Max 40V 2Ah - Model: 29462
Collecting Bag Capacity :
2.2 bushels

Product Videos

  • G-MAX Twin Force 30sec Spot
  • G-MAX Twin Force Instructional
  • G-MAX Family of Tools

Product Images

Customer Reviews

The lawnmower of the future now!
By john ainsworth. On Jun 29, 2014
What a fantastic well thought out mower!  It's liteweight, queit, sturdy, and has some of the best features for the price. This lawnmower reminds me of a twin blade corded BD model I first started mowing with back in the sixties. I have used this mower for a month and find it is well designed and easy to manuever and its so nice not to have mess with a cord as this saves a lot of time and frustration. The batteries easily last for cutting my large lot and is powerful enough for even heavy  thick grass. If your looking for a great mower that the whole family will love to use this is it!
Very impressive first use of mower
By joseph groves. On Jun 24, 2014
I was impressed with the first use of the G-Max Twin Force mower. It was easy to set up, batterys came with some charge so I went ahead and started the mower up. I was surprised how light the mower really is and how easy it was to use, it did a great job cutting the grass and pushing it around the yard was a breeze. Not that cutting grass is fun, this mower will make the task much more enjoyable. I have a perfectly good self propelled gas mower, but I am a beleiver in green products and after looking at countless reviews and took the leap and purchased the mower. Like everyone else the unknown is the battery life and since it comes with a 2 year battery warranty it was worth the risk, technology changes so fast perhaps the price of the batterys will drop and replacing a worn out battery wont be an issue in the future. If you have a small to midsize yard I would recommend you try this mower out.
Father's Day Gift
By Elsie Graham. On Jun 21, 2014
Used it one time with no problems.  Easy to start, love the batteries.  Try it!
This mower is "Fantastic"!!!
By Eugene Lackey. On Jun 20, 2014
This mower is fast, quiet, and has lots of power. It would be better if it came with 2 - 4ah batteries and not 1 - 4ah & 1 - 2ah batteries.
Amazing Lawn Mower!!!
By Samuel Wanner. On Jun 11, 2014
Having always used a gas powered or older cordless mower I wasn't sure what to expect from the Greenworks Twin Force mower. The first time I used it was a breath of fresh air, literally. There were no exhaust fumes! The other thing I noticed after not having to pull a starter rope and hope the engine started was how light it was. The Twin Force weighs 1/2 of what a gas or lead-acid battery powered mower does and is very easy to push. The one handle hight adjustment made selecting the grass length very easy. I tried mulching and bagging and found they both worked well. After I finished cutting you couldn't tell which half I mulched and which half I bagged. I think the bag will be useful in the fall for cutting and picking up leaves. My yard is about 1/3 acre and the Twin Force mower had more than enough power to finish the job. It switched batteries seamlessly just before I was done and increased power automatically when it entered higher or thicker grass. The lithium-ion batteries took less than 2 hours to recharge. The Twin Force mower folds for compact storage and the removable batteries mean you don't have to store this mower near an electrical outlet or leave it plugged in. It is also nice not to have to run to the gas station anymore or store flammable gasoline in the garage. I think this is the perfect mower for urban or development lots and should last a long time if used as intended and comes with a 4 year warranty for peace of mind.
By Steve Brannan. On Jun 04, 2014
This is an AWESOME mower! I have had a Neuton CE 6.2 for several years now (the ONLY battery operated mower I have previously had). It was a TOTALY plastic housing, handle, and wheel assembly making it lightweight but the batteries were bulky and heavy, took overnight to charge, and though they lasted longer on a charge than the G-MAX 20" 40V Cordless Twin Force, the batteries themselves would heat badly and did NOT hold up for many years use. Also, this unit had to have the electronic board and key replaced during this time.Reasons I love the G-MAX 20" 40V Cordless Twin Force:It is ultra light weightThe batteries recharge quickly in one to two hoursThe large rear wheels allow easier handling on my rough and hilly terrainThe handle is lightweight and metal, not plasticThe height adjustment is broader than my previous mower giving me greater lawn-care abilitiesThe four year warranty exceeds my previous mower by double!
By Chris Yarger. On May 28, 2014
charges quickly can mow entire lawn on one battery highly recomend 
Twin Force Mower
By David Acosta. On May 21, 2014
The Twin Force Mower is the best mower for the money I have ever used. 
Going Green with the G-MAX Twin Force
By Greg Ledom. On May 07, 2014
Have only mowed the lawn once at this point, but I can already tell I'm going to love this lawnmower on several fronts. It's light and thus power drive/assist is not required. In fact, it's easier to push than my previous gas mower was to push that had power assist. Batteries vs. gas/oil is a no brainer if it works as advertised and it does. Not having to deal with gas/oil is a huge bonus. Noise is considerably less than a gas engine, which is nice. It also looks cool. I know, this isn't a huge deal, but hey, if your going to be mowing and mowing green, might as well have a cool looking mower. Starting this thing doesn't even compare to a gas mower. Don't have to prime, just push the start button, pull back the bail handle and your good to go. And raising and lowering the mower for height is incredibly easy and with one handle to raise and lower all for wheels at the same time so you don't have to adjust the wheels separately. All in all, I'm extremely pleased and would easily recommend to those with standard sized suburb size lawns. The one drawback is they give you the large battery with the smaller battery and thus your run time is less than if you had two of the larger batteries. I bit the bullet and bought another large battery to increase my mowing time under to large battery charges. 
Gives a beautiful cut
By . On Feb 18, 2014

This mower works fine and gives a nice, even, beautiful cut to my front lawn. After fully charging I cut my front lawn with nearly a full charge still left on the battery. (All four battery indicator lights still come on.) It does a great job. It is a clean looking mower that gives a beautiful clean cut.

Easy to clean without water. I simply brush the clippings off above and below and pull and empty the mulching insert. Also, I should say that the compact design with the easy folding, fold down handle stores well in my small one car garage.

User Manual (pdf)

Customer Support

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