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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

3 votes
How many discharge cycles is it rated for?
Up to approx 2000.
By Trade Tested on January 20 2020
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
See more questions and answers (1)

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All reviews (63)

Read reviews that mention

  • one battery
Good value battery

I purchased this to go with the mower and weed eater and it enables me to mow and do the edges on one battery.

Grant Wellington
So far.. so good

After only a couple of months of use this seems to have been a good purchase. Like anything, time will tell..

K1w1 Auckland
Solid Battery

Love the green works range and these batteries go hard!

Hoggie Auckland
4.0Ah battery

This just keeps going and going and going. I also have the 2.0Ah battery and whilst that's good for smaller jobs around home, the 4.0Ah lasts way longer, I was surprised how much juice this holds and managed to do a couple of hedges no problem without charging. Worth spending more and upgrading to the 4.0Ah

Sievy Waikato
Very good

Very good battery

Moff Mangawhai