Greenworks Pro GCS80420 Cordless Chainsaw Review


In Brief: Greenworks Pro GCS80420 Chainsaw Review

The Greenworks Pro GCS80420 is a cordless chainsaw with a sizable 18-inch bar. It comes with a brushless motor that uses less power and maximizing runtime. The 80V, 2-amp battery pack takes only half an hour to reach capacity. Everything about the GCS80420 shouts efficiency and productivity.

According to the website, Greenworks is a market leader in battery-powered consumer-grade tools. After seeing the quality of its numerous product lines, we wholeheartedly agree with this sentiment.

In this review, we’re looking at the Greenworks Pro GCS80420, a mighty cordless chainsaw powered by an 80V, 2-amp battery.

This chainsaw is a lightweight tool that homeowners, DIY-ers, and professional lumberjacks will love. Check out our full review of the GCS80420 down below.

Key Specifications of Greenworks Pro GCS80420

Greenworks Pro 80V 18-Inch Brushless Cordless Chainsaw, 2.0Ah Battery and Rapid Charger Included GCS80421

The cordless, 80V GCS80420 is available with either a 16- or 18-inch chainsaw. The two lengths are practically similar in cutting capacity, but the 18-inch version will help saw through slightly thicker logs with a single sweep.

The GCS80420 uses a two-amp battery pack that, based on past buyers’ reports, can supply upwards of 40 minutes of runtime per charge.

This amount of cutting time is quite shocking, seeing as how most two-amp chainsaws on the market struggle to get past the 30-minute mark.

This chainsaw is a self-lubing model that automatically applies oil onto the cutting chain. However, any amount of time saved through this system is spent on refilling the minuscule 0.06-pint oil tank.

Here’s a video of the GCS80420 chainsaw in action by Greenwork:


The table below summarizes the GCS80420’s key specifications:

Powered Source
Power (amps)
Runtime (minutes)
Bar Length (inches)
16 or 18
Weight (lbs.)
Noise (dB)
Warranty (months)
Oil Pump Capacity (pints)
Chain Speed (feet/second)

Unique Features

Let’s spend a few moments to talk about the exclusive features found in the GCS80420.

Brushless Motor

Brushless motors outshine brushed motors in every way. Brushless motors utilize magnets to generate power, as opposed to brushed motors that create friction and heat by to drive the chainsaw’s cutting chain.

The GCS80420 allows it to work more efficiently by consuming less power and creating less heat. The result is longer runtimes per charge and a longer-lasting tool by several years compared to its brushed counterparts.

Rapid 30-minute Charge

Rarely will you find a battery charger than can fill an empty 80V battery to maximum capacity in less than an hour.

Greenworks defied all odds by creating such a system that allows the GCS80420 to work for longer than its battery needs to charge fully.

Spending just 30 minutes in the charger, the GCS80420’s 80V battery pack can run for about 45 minutes based on customer claims.

Having a second battery on hand will allow you to work continuously throughout the day.


Performance, Design, and Safety

Here, we’ll go describe in greater detail the GCS80420’s performance, design, and safety features.


The GCS80420 works exceptionally well at trimming and sawing through logs more than a foot in thickness. The benefits of the brushless motor are apparent as soon as you pull the trigger.

There are fewer vibrations, and the cutting chain reaches its maximum cutting speed of about 50 feet per second almost instantly.


The GCS80420’s design makes it a comfortable tool for inexperienced users. Weighing just 13.7 pounds (fully assembled), cutting at shoulder height for extended periods shouldn’t don’t cause too much strain on forearms and back muscles.

The rapid charger is also a huge plus as it diminishes downtime by filling the battery quicker than most.

Tightening the cutting chain requires a screwdriver to turn the tensioning screw until the chain sits flush with the bar. We prefer tool-free tensioning systems, but this is a minor inconvenience at most.


Safety features in the GCS80420 include bucking spikes that slightly split the workpiece to prevent kickback.

The spikes separate two ends of the log, preventing it from pinching the bar and chain and making it easier to complete the cut.

The GCS80420 also comes with an electronic brake chain. By pushing the brake lever forward, the cutting chain will immediately halt in its tracks and keep the bar from swinging upward toward the operator.


Ease of Maintenance, Repairs & Warranty

In this section, we’ll summarize what the operator’s manual has to say about maintenance and Greenwork’s warranty.

Ease of Maintenance and Repairs

Electric chainsaws experience very few maintenance problems. Before pulling the GCS80420’s trigger, make sure that the oil tank is filled with lubricant and wipe off oil seepage.

Also, you will need to sharpen the blade regularly—preferably before each usage—to reduce the risk of kickback and motor burnout.


The GCS80420 is backed by a manufacturer’s limited four-year warranty.

The warranty covers the basics—the cost of diagnosing, fixing, and replacing defective components. As long as you treat the GCS80420 with care, the warranty should remain valid throughout the four-year coverage period.

You can call the company’s toll-free helpline 1-899-90WORKS or visit the website if you have any questions regarding further maintenance and warranty issues.

Price of Greenworks Pro GCS80420

The GCS80420’s price tag is about in the middle of the price spectrum of comparable models. Customers believe that they’re getting the right value for the cost, and we agree.

Considering its flawless brushless motor, one could argue that the GCS80420 is a commercial-line cordless chainsaw for the price of a decent, residential-grade gas-powered model.

Check out the XtremePowerUS 22-inch 45-cc to see what we mean.


Who Should Buy Greenworks Pro GCS80420?

Brushless motors are a game-changer for professional lumberjacks. They provide plenty of cutting power and long runtimes to saw through dozens of trees per charge.

The added benefit of rapid charging makes the GCS80420 a viable cordless chainsaw for pros.

However, based on what customers claim they use the tool for, we see the GCS80420 as being an excellent all-around chainsaw for homeowners and DIY-ers as well.

The sizable 18-inch bar simplifies trimming and sawing jobs, but it also allows enough reach to known down rotting trees.

Why We Like It

Overall, the Greenworks GCS80420 is an enjoyable tool to use. As a cordless chainsaw, the GCS80420 requires few visits to the Maintenance Man as most of the common issues that arise are quick fixes.

For its price, this tool works surprisingly well at sawing through thick logs, mainly due to its high-power brushless motor.


About Ryan Henderson

Ryan has more than ten years of experience writing about power tools. He is an expert in the field, and is able to provide unique insights into the reviews, use, and maintenance of various products. He enjoys cooking when he's not working on his articles, as well as spending time with his dog.