Greenworks GD40CS18 40V Cordless Chainsaw with Brushless Motor

By Greenworks · Model: GD40CS18 · Landscaping & Outdoors

40V cordless chainsaw with brushless motor, 40cm bar length, 20m/s chain speed, auto-oiler, and kickback protection. Battery and charger sold separately.

Brushless motor for efficient power and longer lifespan
40cm (16-inch) bar length for substantial cutting capacity
20m/s chain speed for fast, clean cuts
Automatic chain oiler with 180ml oil tank
Kickback protection with instant chain brake
Compatible with Greenworks 40V 2Ah and 4Ah batteries

Overview

The Greenworks GD40CS18 is a serious cordless chainsaw powered by the Greenworks 40V battery platform. The brushless motor delivers a chain speed of 20m/s through a 40cm bar, making it capable of felling small trees, cutting firewood, and pruning larger branches. An automatic oiling system keeps the chain lubricated, and the integrated chain brake provides essential safety protection. At 3.81kg without the battery, it is considerably lighter than comparable petrol models.

In-Depth Look

Cordless chainsaws have matured significantly in recent years, and the Greenworks GD40CS18 represents the capable end of the 40V consumer market. With a 40cm bar and brushless motor delivering 20m/s chain speed, it sits comfortably between light pruning saws and professional petrol models, making it well suited to garden maintenance and occasional firewood processing.

Motor and Cutting Performance

The brushless motor is the key differentiator from budget cordless chainsaws. It runs more efficiently than brushed alternatives, generating less heat and extracting more cutting power from each battery charge. The 20m/s chain speed is competitive and makes clean work of both green wood and seasoned timber. The 40cm bar length gives enough reach to tackle logs and trunks up to roughly 35cm in diameter in a single pass, which covers most garden tree work.

Safety and Oiling

The chain brake is activated either by the front hand guard or by kickback detection, stopping the chain almost instantly. This is a critical safety feature for any chainsaw, and its inclusion here is reassuring. The automatic oiling system feeds bar oil from the 180ml tank to the chain during operation, keeping the cutting system properly lubricated without any manual pumping. A visible oil level window makes it easy to check when a refill is needed.

Battery Platform

This is a tool-only unit, so you will need a Greenworks 40V battery and charger. Both 2Ah and 4Ah batteries are compatible, with the larger capacity naturally providing longer runtime. For those already invested in the Greenworks 40V platform through other garden tools, this is an efficient way to add a chainsaw without buying into a new battery ecosystem. For new buyers, the additional battery cost should be factored into the overall investment.

Verdict

The Greenworks GD40CS18 is a capable and well-specified cordless chainsaw that handles most domestic cutting tasks with ease. The brushless motor, auto-oiler, and proper chain brake bring a level of quality that justifies the step up from basic models. The main consideration is that the battery and charger are not included, so budget accordingly. For garden maintenance, firewood, and occasional tree work, it delivers a compelling cordless alternative to the noise and maintenance of petrol.

Specifications
Battery Platform	Greenworks 40V lithium-ion (sold separately)
Motor	Brushless
Bar Length	40cm (16 inches)
Chain Speed	20m/s
Oil Tank Capacity	180ml
Weight (without battery)	3.81kg
Safety	Chain brake with kickback protection

Who It's For

Gardeners and smallholders needing to fell small trees or cut firewood
Homeowners wanting a cordless alternative to petrol chainsaws
Existing Greenworks 40V battery owners expanding their tool collection

Pros & Cons

Pros

Brushless motor maximises battery efficiency and tool lifespan
40cm bar handles substantial logs and tree trunks
Significantly lighter and quieter than petrol chainsaws
Auto-oiler keeps the chain lubricated without manual intervention

Cons

Battery and charger sold separately adds to the total cost
Runtime depends on battery capacity and cutting intensity
Less sustained power than a comparable petrol chainsaw for extended felling

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