GreenWorks 25302 G-MAX Battery Lawn Mower Review

With the rapid improvement in battery and electric motor technology, the cordless lawn mower category is quickly filling up with top quality products, and our testing of the GreenWorks G-Max mower has really awoken us as to just how good a cordless mower can be.

Not all that long a ago battery powered lawn mowers were nothing more than a gimmick, but with the latest jumps forward in lawn mower battery technology they really are now a serious contender if you are in the market for a new lawn mower.

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greenworks g25302

Read on to learn more about why we think you should seriously consider the GreenWorks G-Max cordless mower.

See our review summary here or continue reading the entire post for the in-depth review.

Greenworks 25302 G-MAX 40v Review

Greenworks G-Max Review Summary
Worth a serious look!

The Greenworks G-MAX 40V electric mower is a light little mower that doesn't lack in power. With some advanced features that mostly work as intended, it should be on the list of mowers to consider seriously.

Read on for an in depth review of the Gmax 25302

Run Time
Additional Features
Ease of use
Comes with 2 batteries
Low vibration when in use
Long run time - up to 70 minutes
Nice and light
Not self propelled - but it really is light enough that it doesn't matter
Auto throttle is slow to respond
Charger only charges one battery at a time
Where to Buy

Greenworks G-Max Batteries

One of the most frustrating things about battery lawn mowers is that they just always seem to run out of battery too quickly.

Well the Greenworks G-MAX 40V electric mower has found away around this frustration, and it really is such a simple solution.

Greenworks G-Max Battery

Greenworks have been able to offer up to 70 minutes of run time  out of the G-Max 40v by using two batteries – at the same time!

It features a state of the art battery switching system, so that when one goes dead it automatically switches over the charged battery and you can keep mowing.

The batteries are of the Lithium-Ion type which means that you don’t have to worry about them building up a memory and losing their charge capacity.

There is one thing about the batteries that may be confusing to some people, the two included batteries are different. They both fit the Greenworks G-MAX mower, but they are different capacities. One is 2 Ah and the other is 4Ah. I’m not really sure why they did it this way, I guess it was a way to get the run time up to 70 minutes but keeping costs down.

Our only complaint when dealing with the battery system, is that the included charger only fits one battery at a time. This can be a bit frustrating if you do have a larger lawn to mow and you need to wait for two batteries to charge.

Battery specs got you confused? Check out our power tools battery guide.

Out Of The Box & Storage

If you are worried about there being too much assembly of Greenworks G-MAX 40v Electric Mower out of the box, then don’t. The setup is relatively painless and you can have it up and ready to go in about 5 minutes. Then you just need to charge the batteries of course!

The mower has a mulching plug that is pre-installed, you will need to remove this if you don’t want to use the mulching feature.

The procedure to store the mower is fairly simple, the handle folds up quickly and easily and it stores away nice and neat.

The manual does recommend that if you are storing it for any length of time, you charge the battery at least every 2 months.

Cutting Power

The Greenworks G-MAX 40V Mower uses a twin blade cutting system, which we found are a great feature.

Greenworkds 25302 ReviewWe also thought the mulching functionality was top notch, even when mowing over sticks and other items that fall out of trees – the twin blades make short work of it. With just grass, there are no visible clippings left anyway on the lawn.

A 20 inch cutting deck saves you time (and your legs) as well. Because it is a little wider than most of the other electric mowers on the market, so mowing your lawns will require less passes.

The single height adjustment lever means it is super easy to adjust the cutting height of your mower in one action. There is no need to adjust each wheel individually.

Feature – Auto-Throttle

40v cordless mower on grass

The Greenworks G-Max has a built in autothrottle, which automatically adjust power to the cutting blades so the mower is not working harder than it has to. This maximizes battery run time and will also likely lengthen the life of the electric mower due to it not running at full throttle all the time.

In theory, this is a great idea. However, we found that the autothrottle can be a little slow to react when you hit a thicker or longer patch of grass. This meant that the mower would struggle for a few seconds until the autothrottle kicked in and powered up the mower. It’s more of an annoyance than a real problem, but it should be mentioned.


If you don’t think the G25302 is for you, then check out these popular alternatives.

Upgrade Model

On Sale - Save $34.51

Greenworks 80V MO80L410 Mower

If you are after a bit more power, then the Greenworks 80V mower is probably what you want.

This is one seriously powerful lawn mower. You can read our Greenworks 80v Mower review here.

Check Amazon Price Info last updated 2021-09-16 at 21:23

Cheaper Option

SunJoe ION16LMCT Mower

If you are wanting something a bit cheaper, then the SunJoe cordless mower is a great alternative.

It does have a smaller cutting width, but it is still a great little mower.

Check Amazon Price Info last updated 2021-09-16 at 21:23

Greenworks G25302 – Should You Buy It?

The Greenworks 40V range of tools are great, and the G25302 is no exception to this. It has all the features you need and most of them work really well.

It is also priced very competitively and will give almost any competitor a run for their money. You won’t be disappointed with this lawn mower.

See if this mower made our best cordless mowers list here.

On Sale - Save $59.85
Greenworks 40V 20-Inch Cordless (2-In-1) Push Lawn Mower, 4.0Ah + 2.0Ah Battery and Charger Included...
  • G-max 40V Li-Ion battery system powers multiple tools for complete yard work system-includes one 4 Ah battery and one 2 Ah battery and charger
  • 20-inch cutting deck offers a great balance of maneuverability and cutting capacity making it ideal for mid-sized areas
  • Innovative smart cut technology adjusts for power or runtime based on the thickness of your grass
  • Dual blades offer better cut quality, superior mulching and bagging capabilities
  • Kindly review the user manual under technical specification for troubleshooting steps and set up instructions
About The Author

Aaron is the founder of and Essential Home and Garden. He likes to spend his spare time with his family, and doing DIY projects in the home and garden.

3 thoughts on “GreenWorks 25302 G-MAX Battery Lawn Mower Review”

  1. I cannot figure out how to get the mower to bag the clippings. I put the bag on and nothing flows into it. Thanks for any advice


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