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GreenWorks 21242 G-MAX Cordless String Trimmer

Reviewed By: Mark Rafferty
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For long-lasting power-trimming Greenworks are claiming to be 40% more than competitors. With this in mind it’s worth buying already so long as it is all that you need. The G-Max is a hugely popular choice when it comes to cordless electric trimming. It will chop through most long grass and weeds with ease. It’s easy to handle and manevure with its telescopic shaft comprisiing of a miltiple position swivel head which can be optimized to become a better edger. By the simple flick of a switch it goes from trimmer to edger. You’ll also love that it has different power settings to allow you a better runtime and it can easily run for up to 50 minutes.

For energy standards and green rating they have this nailed. You won’t have to worry about your carbon footprint here as they have created a product that is very low emissions and up-to-date with energy standards. The battery itself having an indicator of how much power is left so you know when to charge and charging takes less than an hour. So if you’ve got one battery you cn have 40 minutes of power trimming time without worrying, or buying a backup you’ll get 80 minutes. You’re probably not going to be longer than 40 minutes in the garden if this is your type of product. Users report it’s everything the home gardener needs when trimming and edging in typically average sized garden areas.

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  • Energy efficient
  • Long lasting battery life
  • Versatile design
  • Edger and trimmer setting
  • Different power settings
  • Automatic line feed
  • 4 year warranty and 2 year battery warranty
  • Single string
  • Users report balance is difficult


  • High Performance G-MAX 40V Lithium-Ion Battery delivers fade-free power with no memory loss after charging
  • 13-inch cutting path for quick and easy trimmer with powerful results to cut through the toughest weeds
  • Versatile design with 3-position pivoting head for easy trimming at multiple angles
  • 90 degree rotating head with edging wheel for walk behind edging for versatile use
  • Compatible Only with G-MAX 40V Battery Models 29462 and 29472

Customer Reviews

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How to Choose a Battery Powered Cordless Grass String Trimmer

Cordless battery powered sting trimmers are a popular choice for their quiet operation, low carbon emissions ease of use and negating the need to fill with gas plus more. What is it that you need to look out for when choosing the one for your needs?

Battery & Power

Usual battery runtime for a cordless grass strimmer is between 40 to 50 minutes. Depending on the type of battery (lithium-ion being most preferred for its fast charging, long lasting and long life cycle features), will depend on what usage time and power you get. Other things to look out for are the volts and amps so you can tell how powerful the trimmer might be.


There aren't many brands that make battery powered grass trimmers which makes it quite easy to make a decision. There are some more reputable and supportive brands than others. Researching the brand before purchase could be a good idea.


If you want a trimmer to last very long then battery powered might not be for you. Decide what your usage needs are and match the features to this. For example, some trimmers double up as edgers or have extending handles. What features do you need to get the job done?

Automatic or Manual Line Feed

When feeding the line while trimming do you want it to be automatic or manual? Manual is usually the stop and bump method and automatic there is no need. There is also trimmers with dual capability. Some people will prefer automatic but some complain it can get awkward when enough line doesn't feed. Be aware of this.

Size, Ergonomics & Weight

As you will be using the trimmer for lengthy periods of time you comfort is important . If the trimmer doesn't have a comfort grip handle will your hands suffer? Or if it is heavy, will you be able to carry it for the amount of time you need?  


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