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Greenworks G-MAX 40V 4.0Ah Li-Ion Battery

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Product overview

The Greenworks G-MAX 40V lithium-ion battery system delivers longer run time, higher performance, and greater output among all Greenworks G-MAX tools.

About Greenworks The future is here and it's electric. Once you’ve experienced the power, convenience and economy of a 40V garden tool there will be no going back. The G-MAX 40V Li-Ion range from Greenworks is already a best-seller in the US and Europe, now it’s ready to revolutionise the way Kiwi’s take care of their backyard.

Greenworks tools are clean, green, quiet and maintenance free, with no compromises – experience the future today.

• 4.0Ah, 40V Lithium-Ion battery
• Compatible with all products within the Greenworks 40V range
• Fast charging
• No memory effect
• No self-discharge
• One Greenworks G-MAX 40V battery powers all Greenworks 40V tools
• 3 Year Greenworks Battery Warranty

Product code: 2927007
Model: G40B4
Voltage: 40V
Charging time 100% (4Ah): 120mins
Battery pack capacity: 4Ah
Watt hours: 144Wh
Weight: 2kg

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Questions and answers

5 votes
How many discharge cycles is it rated for?
Up to approx 2000.
By Trade Tested on January 20 2020
0 votes
Is the 4.0Ah compatible with the polesaw and hedge trimmer? Will it fit in their housings?
Yes the 4.0Ah battery is compatible. As long as you are using a 40V Greenworks battery on a 40V Greenworks product then it will work!
By Trade Tested on November 27 2022
1 vote
How much time does the battery last for before it runs out while in use?
This is not an easily answered question, this is rated at 4Ah (amp hours), which means it has enough charge to run for an hour when a steady current of 4A is being drawn. However in practice no tool really runs like this - it depends on power needed to run the tool and loading required by the job. So even on the same tool (say a chainsaw) the run time will change depending on the hardness of the wood etc.
By Trade Tested on January 05 2021
1 vote
Is it a direct replacement for the 2 AH unit and does the charger suit both 2 and 4 AH Batteries?
Yes to both.
By Trade Tested on March 26 2020
0 votes
Will this battery operate the 18V LI-ION Hedge trimmer and the Blower Vac G-Max 40V LI-ON?
This will only operate 40V.
By Trade Tested on December 29 2021
0 votes
Yes it will.
By Trade Tested on November 15 2021
0 votes
Hi will this be suitable to replace the Ryobi 36v battery and if so will the ryobi charger work with it?
No it won't, these are not cross-compatible with other brands (and vice versa).
By Trade Tested on May 20 2020

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All reviews (120)

Read reviews that mention

  • one battery
  • recharge
  • 4 amp
  • 2.0ah
  • one go
  • greenwork lawnmower
  • job without
  • large lawn
  • whole lawn
  • mowed
greenworks G_MAX 40V4.0AHLILON BATTERY

Fast charge and plenty on grunt very impressed

lew Otago
Greenworks G-Max 40V 4.0Ah Li-ion Battery

I brought this Battery to use in my Greenworks Blower/Vacuum and was very impressed with the product as it takes very little time to recharge and as yet i have not been able to fully run it down. i have now purchased three items from the Greenworks Garden range and i am more than satisfied with the results from them all and certainly would recommend them to everyone they are great and the battery life from both the 4.0Ah and the 2.0Ah battery's are phenomenal

pops Auckland
greenworks G-MAX 40 V Li-Ion Battery

I have a large number of Greenworks Garden Tools which require Grrenworks Batteries. These include a Lawnmower, two different types of hedge trimmers and an electric chainsaw. The batteries give great performance for these Garden Tools.

Bruce Auckland
Powerful battery

Great long life for jobs!

Mark Auckland
Greenworks 40v, 4amp hour battery

Fantastic product, makes gardening easy.

Edward Amberley, North Canterbury


MARCO Waikato
Greenworks G-Max 40V Battery.

Prompt dispatch and charged up as soon as it arrived. Top result and lasts so much longer than my older battery. If in doubt go bigger and newer.

Wendy Hawke's Bay
Exactly what I needed for my Greenworks mower GD40LM46

I have the Greenworks mower (GD40LM46) which has been working great, but we have moved to a larger property and the battery didn't manage to get both the front and back lawns. Buying this battery means we can do both in one go quick and eat. Highly recommend this if you need longer cutting time.

Tibor Auckland
Great Greenworks

I am a firm supporter of Greenworks products - we have a lawnmower, hedge trimmers and a few batteries to keep them going. Fantastic brand and great products - highly recommended.

Al Auckland
Great battery

Very happy with the battery

Caro Canterbury