Dewalt DCST990H1 String Trimmer Review

The Dewalt DCST990H1 is a string trimmer that delivers the same performance as a gas model, but with the convenience of being cordless. With a high capacity battery, generous cutting swatch and a patented gear drive, this trimmer is tough enough to get the job done quickly.

Dewalt DCST990H1 String Trimmer Review

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Dewalt DCST990H1 String Trimmer Features
Powered by a 40V 6.0Ah li-ion battery (50% more battery capacity)
Variable trigger
Bump feed w/dual 0.080” line
15” cutting swath
Patented gear drive
Metal gear case

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Powered by a 40V, 6.0Ah lithium ion battery, the DCST990H1 offers 50% more battery capacity than its competitors. The improved battery capacity combined with the trimmer’s generous 15” cutting swath allows you to get the job done much faster.

With the DCST990H1, you can easily clear thick weeds and grass in just one pass.

If you’re concerned that a single battery won’t get the job done, Dewalt offers additional batteries, so you always have at least one spare on hand.

Dewalt DCST990H1 String Trimmer

The trimmer’s brushless motor allows for an even longer runtime and life. The energy transfer is automatically controlled by the motor, which lets the trimmer run for longer in between each charge.

Because the DCST990H1 is powered by battery, there’s no need to deal with mixing gas or difficult start-ups. Simply pull the trigger, and get started.

The gear drive design is another feature that’s unique to the Dewalt line of trimmers. Not only does it amplify the torque, but it also allows you to maintain the same cutting speed even when under heavier loads.

With a variable speed trigger, you have more control over the trimmer’s power. The Hi/Lo speed control also allows you to manage the trimmer’s run time more efficiently, and make adjustments to ensure proper performance. The bump feed head features dual 0.080” line, which also gives you control over the feed rate. Ultimately, the DCST990H1 is all about giving the user complete control over how the trimmer performs.

Housed in a heavy-duty aluminum case, the DCST990H1 is highly durable and can withstand professional usage.

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The DCST990H1 trimmer comes with a battery, charger, pre-wound 0.080” line, auxiliary handle and guard.


Just as powerful as a gas trimmer
Easy to start with a simple pull trigger
Comes with pre-wound string
Can tackle tough weeds with ease
Extended battery life
Generous size cutting swath can clear weed and grass in one pass
Heavy-duty aluminum casing adds durability


A little heavy and bulky
The only gripe with this trimmer is that it’s a little heavy and on the bulky side. That makes it a little difficult to use the trimmer in tighter places. That being said, heavier weight is to be expected with a trimmer that has this much power and battery life.

All in all, the Dewalt DCST990H1 is an excellent trimmer, and a smart choice for homeowners with larger yards. The extended battery capacity will allow you to get the job done faster and without having to stop mid-way to recharge.

With a powerful motor, this trimmer is on par with most gas models on the market today.

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