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DeWalt 40V DCST990M1 15" Battery Powered Trimmer (4 Ah Battery)

Model: DCST991M1  |  Item Number: DCST990M1
UPC: 885911419307
 - 5.00 Stars - Based on 1 Review(s)
Reg. Price: Sold Out Sold Out
CARB Compliant Power Equipment

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Features for the Dewalt DCST991M1

The 40V brushless trimmer from DeWalt is the trimmer that you need to help you tackle all of your jobs. Weighing just 13 lbs. this trimmer will allow you to work longer without fatigue, plus the padded auxiliary handle provides a comfortable grip for easy operation. A full variable trigger allows you to easily control the power and the speed control allows you to adjust speed and runtime. The 4 Ah premium high capacity battery in combination with the brushless motor maximize the run time and motor life. The bump feed head makes letting out more trimmer line extreme easy, so you don’t have to stop trimming. The DeWalt DCST9900M1 trimmer is the perfect balance of durable, comfortable and efficient.

  • High Capacity Battery:4.0Ah 40V battery gives you long lasting power.
  • Bump Feed Head:Easily control the line feed – accepts .080” and .095” trimmer line.
  • Patented Gear Drive Design:Provides amplified torque to maintain speed under load and allows you to power through tough overgrowth.
  • Variable Speed Trigger: Hi/lo speed control for added power and extended run time.
  • 15” Cut Swath: Large cut area to get your job done faster.
  • Metal Gear case and Xenoy Housing:Durable, for a long life.

This product may contain chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. For more information, go to

Technical Specs for the Dewalt DCST991M1*

Battery 40V 4Ah Lithium-Ion Battery

Working Width 15"

Weight (lbs.) 13 lbs.

Line Diameter .080" (also accepts .095")

Cutting Equipment
Cutting Speed 0-5600 rpm - low
0-6600 rpm - high

* These Technical Specs are provided by the manufacturer at the beginning of the model year. Please be aware that the manufacturer may decide to change these specs at any given time without notice.

Reviews for the DCST991M1

Review Rating: Sort By:

Reviewed on   -   Purchased on 4/21/2020
The Dewalt 40v string trimmer is very
well made, quiet, and powerful.  Too bad
Dewalt discontinued the 40v line of tools.

Q & A for the Dewalt DCST991M1

Ask us about the DeWalt 40V DCST990M1 15" Battery Powered Trimmer (4 Ah Battery). Please no repair questions. Your Q&A may be posted to to help other shoppers, like you, with their purchasing decisions. Thank you.

Asked on 6/5/2020 12:15:40 PM by Mark
Does this come with the battery and charger.

Mark, the battery is included, but the charger must be purchased separately.