GreenWorks 25302 G-MAX Battery Lawn Mower Review. Greenworks lawn mower battery

Greenworks lawn mower battery

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You probably want all your electronics to run on the 18650 lithium-ion cell. You just don’t know it yet.

Recently came across a free Greenworks mower. Came with 2 batteries. 1 good one that will charge and operate the mower with ease. And 1 battery that doesnt display having any power on the “power preview” button on the battery itself. When plugged into the charger, it reads “fully charged” but clearly is not. I took it apart and it has these yellow batteries that read LGDBHE41865. Theres 20 of them and 6 are dead. I have 3.7v on all the others, while 6 read 0.008v. I would like to replace these yellow batteries and put it all back together. Ive never repaired any electronics, but pride myself on being super handy. I am quite confident i could put this battery back together and make it work again.

The problem im having is finding these batteries online that have the same numbers written underneath. 0290j172af 134 are the other letters/numbers written. Can someone point me in the correct direction as to where to buy these, or a suitable substitute?? thanks for any help

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.

Disclosure: As an Amazon Associate I earn from qualifying purchases. However, this does not impact our reviews and comparisons. All opinions are our own we pride ourselves on keeping our articles fair and balanced. For more info see our disclosure statement.

greenworks, 25302, g-max, battery

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 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, 25302, 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.

We 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

greenworks, 25302, g-max, battery

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

greenworks, 25302, g-max, battery

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.

Cheaper Option

greenworks, 25302, g-max, battery

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.

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.

greenworks, 25302, g-max, battery

Greenworks 30” Self-Propelled Lawn Mower with (3) 8Ah Batteries and Dual Port Charger

The Greenworks Commercial 82V 30″ Self-Propelled Mower’s every component was thoughtfully created with commercial landscapers in mind. Comes with a rather sizable grass bag.

Greenworks 40V 14″ Cordless Lawn Mower Replacement Battery

Brand New. Premium quality Greenworks 40V 14″ Cordless Lawn Mower gardening tools replacement battery. Designed for reliable performance and high durability, this battery is 100% compatible with the original equipment.

Brand New. Premium quality Greenworks 40V 14″ Cordless Lawn Mower gardening tools replacement battery. Designed for reliable performance and high durability, this battery is 100% compatible with the original equipment.

  • Uses the highest quality graded and sorted ‘A’ Grade cells.
  • Has resistance welded gold plated contacts for maximum performance.
  • Provides excellent discharge characteristics.
  • Uses high impact ABS and Polycarbonate plastic housings for ruggedness.
  • Undergone comprehensive testing including high altitude performance, vibration, mechanical shock, thermal cycling, external short circuit and overcharge test simulations.
  • Includes a 12-months free replacement warranty for manufacturer’s defects.

We provide premium quality compatible Greenworks gardening tools batteries, manufactured by ISO 9001 certified plants using state-of-the-art technology for the finest quality Greenworks gardening tools batteries. Each Greenworks gardening tools replacement battery is tested throughout the manufacturing process to match or outperform the original equipments specifications for form, fit and workmanship.

Greenworks GWG40B2

It’s always a good idea to check that the voltage we list for this battery matches the voltage on your original battery. Also be sure to match the battery part number on your battery with one of the part numbers listed above in the “This Battery Replaces” section. Or you can always call us for assistance!

Greenworks 40V 14″ Cordless Lawn Mower Replacement Battery

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All brand names, logos, and trademarks referenced on this site remain the property of their respective owners. They are used for descriptive purposes, and to demonstrate compatibility only. is not affiliated with, or endorsed by any brand name manufacturer. We do not sell original name-brand batteries. limitation of liability is strictly limited to the purchase price of the product. In no event shall we be responsible for incidental or consequential damages of any kind. Users accept all policies expressed on this site. Use of the site constitutes acceptance of our Terms of Use. © 2005. 2023 All Rights Reserved. is a service of Cut-Rate Batteries, LLC.

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Greenworks Pro 40V Self-Propelled Mower (2023 Update)

The Greenworks Pro 40V 21” Brushless Self-Propelled Lawn Mower was one of the first major players in the electric mower space when they launched their first mower in 2016. Five years later, the market demand has steadily increased with increased public perception and battery capabilities.

Greenworks has really become a major player in the e-tool marketplace with over 75 tools. Today we will examine one of Greenworks top selling models, the Pro 40V 21” Brushless Self-Propelled Lawn Mower.

  • First impressions
  • My experience with the Greenworks mower
  • Our recommendation

Why we review lawn tools

The reason we started this website in the first place was because we had so much trouble trying to find reasonable, understandable, honest reviews for lawn equipment. And it’s not cheap! After hours and hours of research, trying products and returning them, and messing up our yards – we started this site.

As people who had to learn the hard way, we want you to know exactly what you are signing up for before you purchase a piece of equipment. That’s why we are committed to providing honest, easy-to-understand reviews that mean something.

First impressions of the Greenworks Pro 40V 21” Brushless Self-Propelled Lawn Mower

Though I haven’t always been the biggest fan of electric mowers, the Greenworks mower has caught my attention for a variety of different reasons; the light, compact design, the SmartCut technology which enables you to adjust blade speed, and the variable speed setting to control how fast the mower goes. The cool green color makes it pop too! Also, it’s a nice touch that this comes with a spare blade.


This mower is very intuitive. It includes a start button (which is very strange for a guy who is used to ripping a string to get his mower humming). Now I just click a button and it quietly hums along.

It also includes a turbo button to, you guessed it, turn up the power on your cuts. It also includes an on-board battery indicator up by the throttle control so you can easily see how much power you have left.

The mower also has EZ Fold Handles which cause it to break down and store with ease. It also features a 7-position single lever height adjustment handle on the back right side which I must say is a pretty sweet addition. I can’t stand having to change all four of my different wheel heights and inevitably I forget to change one and have uneven cuts for a few passes.


The 21” steel deck should provide good durability in the event you run over a rock, stick or tennis ball. However, the whole thing itself looks very plastic-y. I don’t see it being extremely weather resistant. Plastic seems to tire out if left out in the sun too long. I’d like something a little sturdier looking than this.

Greenworks also provides a 4 year tool battery warranty which is pretty long in my opinion. It must mean they stand by their product! I believe most mowers have a 3 year warranty so adding that additional year means they must really believe in their product.

Battery Life

Greenworks 40V mower boasts a 60 minute battery and I’m like… So?… Unless you have ¼ to ½ an acre yard this is simply not enough time to cut your yard – Especially if you use the NOS, I mean turbo button.

But in reality, this ends up being enough juice for most people. You can either buy an additional battery, or consider conserving battery life by making sure to mow when the grass is completely dry or by leaving the self-propelled function off.

Greenworks Lawn Mower: My experience

The mower itself is pretty light and easy to handle even though the deck is made of steel. Most people from the age of 12 – 65 should be able to handle this mean green mowing machine just fine. It also folds up in a self proclaimed “2 seconds.” So take that for what you will.

I don’t know how that really impacts the way the mower works but I guess it makes it that much quicker to a nice Bud Latte during a hot summer afternoon.

SmartCut technology from Greenworks

Greenworks also uses a SmartCut technology that lets you control how fast your blade spins, thereby impacting how long your battery lasts as well. The battery pack on this mower says you can run it for 60 minutes but that will more than likely be on the lowest setting possible and the minute you start to introduce hills and tougher mowing conditions your battery will be zapped.

Also this mower is rated for a ¾ of an acre yard but my yard is ¾ an acre and I’ve never mowed it in less than an hour so I’d imagine I’ll have to buy another battery to finish the whole yard.

Clipping control

In addition to controlling how fast the blade spins you can also control what happens to your clippings, you can select 1 of 4 different mowing settings: Mulch, Bagging, Side Discharge and Leaf Pick-Up. Personally, I have no idea why anyone would use the side discharge option. It seems like it’d be such a mess to me. I see myself using the mulch and leaf pick-up options the most. The bagging option would probably only be used on my first mow of the season if I’m late to getting the cut in. I currently use my bag to chop up leaves and pack them in a little tighter.

The self-propelled function

This mower also offers the user the ability to control how fast the self-propelled function works. Similar to the SmartCut technology discussed above I imagine if you want to go faster you’ll use the battery much quicker than 60 minutes. I guess that’s the price you pay for not wanting to use gas powered mowers.

Another feature that I found to be beneficial were the headlights – that’d really come in handy during late fall afternoon mows when the sun starts to set early. I also thought the leaf pickup function via the turbo button would be really handy, basically a vacuum for your yard. From what I can gather it turns the blade off and just sucks up the leaves.

Greenworks Pro 40V 21” Brushless Self-Propelled Lawn Mower: Our recommendation

Though I love mowing lawns and trying new things, this one is tough for me. It all comes down to the battery life. Personally, so long as the battery doesn’t allow me to cut with the same power and length as my gas power mower cuts, I’ll never buy an electric mower. The battery technology has come a long way but it’s still lightyears away from being able to stand toe to toe with Honda or Toro gas powered mowers. I simply don’t want to have to worry about losing power 3/4ths through my mow. HOWEVER, if I had to buy an electric mower this is one that I would seriously consider.

Compared to other electric mowers like the Sun Joe, Ryobi, or the DeWALT, this one has a tad more experience.

Interested in other electric mowers? Check out our electric mower buying guide.

greenworks lawn mower 40V Li-ion Battery PCB board

greenworks, 25302, g-max, battery

greenworks, 25302, g-max, battery

This is The PCB or PCB with plastic box accessories for greenworks lawn mower 40V Li-ion Battery PCB board

greenworks, 25302, g-max, battery

greenworks, 25302, g-max, battery

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