Dewalt DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer (Tool Only)

Dewalt Model: dewndcst920b
ratings        (89) Write A Review
free shipping
This item qualifies for
free shipping

Estimates For

alert warning icon

  • In Stock


CA Residents
Prop 65 Warning
compliance warning icon
WARNING: Cancer and Reproductive Harm --
Dewalt DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer (Tool Only) Dewalt Model: dewndcst920b
price for vip customer


Product Features & specs :

20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer gets ride of grass and weeds quickly


13 in. cutting swath gets ride of grass and weeds quickly

20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer features lightweight and compact design


Lightweight and compact design minimizes fatigue

20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer features two speed control


Variable trigger with two speed control to adjust to your trimming task

Less Maintenance, Low Noise, No Pull Cords

Tool Functionality

Less maintenance, low noise, and no pull cords

200 plus products and growing in the 20V MAX family of tools

200+ Products

Our largest cordless platform continues to expand making 20V MAX a system you can build on

Compatible with a Wide Range of 20V MAX Batteries to fit your needs

Dewalt DCB203 battery for lightweight usage

More Compact 2 Ah

Dewalt DCB230 battery

3 Ah

Dewalt DCB204 battery

4 Ah

Dewalt DCB205 battery

5 Ah

Dewalt DCB206 battery

6 Ah

Dewalt DCB612 battery with long run time

More Runtime 12 Ah

Dewalt DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer (Tool Only)

The DCST920B 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer provides precise power control with a variable speed trigger as well as performance and run time management with the Hi/Lo speed control switch. The patented gear drive design will provide more torque and maintain cut speed under load, while the dual-line bump feed head clears a full 13 inches. Well balanced and only 8.5 lbs. with a 20V MAX 5.0 Ah Lithium-Ion battery, the string trimmer easy to maneuver and puts less stress on the user.
  • 13 in. cutting swath
  • Brushless Motor maximizing motor efficiency and durability
  • Dual 0.080 in. line with bump feed
  • Lightweight and ergonomic design
  • Variable speed trigger and speed control
  • Patented gear drive design
What’s Included:
  • 20V MAX Lithium-Ion XR Brushless 13 in. String Trimmer - DCST920
  • Auxiliary Handle
  • Guard
  • 0.080 in. Line Pre-wound Spool
  • Tool Only: Battery and Charger Sold Separately
Power Source
UL Safety
CSA Safety
Wifi compatibility
Batteries Included
Battery Type
Starter Type
Case Included
Speed Settings
Bluetooth Compatibility
Motor Type
Blade Construction
Charger Included
ETL Safety
Battery System
35.63 in.
12.5 in.
10.75 in.
7.3 lbs.
Warranty Term
3 Year

Reviews :

4.5 / 5.0
41 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend this product?
Yes (26)
No (2)
Powerful (22)
Lightweight (17)
Easy To Use (15)
Value (8)
Heavy (3)
Lack of Power (3)
Short Run Time (if applicable) (3)
Uncomfortable to Use (3)
Best Uses
Small Projects (11)
Frequent Use (9)
Large Projects (5)
Home Repair (1)
Would you recommend this product?
Easy To Use
Ergonomic Design
Short Run Time (if applicable)
Best Uses
Small Projects
This product fits our needs around outside of house. Larger battery can be purchased if needed.
September 1, 2020
2 months ago
Describe Yourself:
Avid Do-it-Yourselfer
Would you recommend this product?
Easy To Use
Ergonomic Design
Battery Longevity (if applicable)
Best Uses
Frequent Use
Small Projects
Excellent for a cordless trimmer
Excellent tool as expected from DeWalt. Easily replaces my gas trimmer for my medium size suburban yard. 5ah battery is all I use. The 2 speed variable switch could be smoother. It’s difficult to hold speeds between very slow and full speed- not that you’d use them too often but if you’re gonna have a VS model then make it easy to control. Otherwise a great trimmer
July 20, 2020
3 months ago
Describe Yourself:
Avid Do-it-Yourselfer
Great battery powered trimmer
I've had this battery powered trimmer for three years. It has great power! I have a big house and yard and this trimmer will easily trim it all with only one or two batteries.
This review was collected as part of a promotion
November 9, 2019
Originally posted at
Works perfectly for my needs!!
I have 1/3 acre of grass that I maintain weekly. The trimmer gets plenty of use. The first one I owned had an issue with the motor and was quickly replaced at the local dewalt repair shop (no charge and then my second one has lasted me about 3 years so far! I have paired this with the dewalt lawnmower and they all use the same batteries so that keeps my garage nice and neat. Love dewalt and their support behind their products!
This review was collected as part of a promotion
November 6, 2019
Originally posted at
so easy to use
I bought this in the spring and have used it all summer. Very happy with its performance. Has to restring it in August. I bought Dewalt replacement string and rewound the original spool. This worked great, and a real savings over a new head.
This review was collected as part of a promotion
November 6, 2019
Originally posted at
Great trimmer
I got this for free Father’s Day and love it. It’s plenty powerful, even compared to gas trimmers. It has 2 speeds and does well on both. The only improvement I would suggest is a wheel to use as a guide like I’ve seen on some smaller battery trimmers. Otherwise, I’m thrilled
This review was collected as part of a promotion
June 30, 2019
Originally posted at
Love it
I love this trimmer. I can’t wait to use it every time I mow. It’s light and I don’t have to bend over much cause it’s perfect length. I’m 6’ 4 and not much for bending down.
This review was collected as part of a promotion
June 30, 2019
Originally posted at
Purchased for my wife last month, most rechargable have little battery life, lighter than my gas powered but will do alot of work easy to use we have a lot of trimming only concern is the motor vents seem to plug up easily. Same voltage as drill and screw gun, an added feature
June 22, 2019
Originally posted at
Quality is unmatched
I started using this product, and did not realize it had two speed settings. I was on the low setting, and was pleased with how good it cut the grass. Then, on a second outing, I realized it had two speeds. I selected the higher of the two speeds, and instantly went from pleased, to IMPRESSED!! I'll never buy another gas trimmer for my home trimming needs!
May 29, 2019
Originally posted at
So easy!
Talked myself into a battery operated trimmer because tired of fighting to start my gas one. Wow! Why did I wait so long! Install battery and go! Great power to.
May 27, 2019
Originally posted at

Q & A :

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 12 questions Browse 12 questions and 18 answers
Do you have a trimmer with a blade instead of string?
D H on Apr 7, 2018
I have a recent model DeWalt cordless drill with 20V battery pack. It doesn't say 5A on the battery I have. Will it fit and power this tool? If so, will it work for decent amount of time? I have a very small yard.
ChillyWilly on Jun 2, 2016
BEST ANSWER: Dewalt has many different batteries available for their 20 volt Max Cordless Tools. Look on the bottom of the battery to verify which amp one you have. To my knowledge they have a 1.3AH, 1.5AH (small black), 2AH (small yellow), 3AH (large black), 4AH (large yellow), 5AH (large yellow with a 5 on side), and Dewalt is coming out with a 6AH or its already available to order online called FlexVolt (I didn't see it at the Home Depot I went to) and I heard from the Dewalt rep. that they are even releasing a 9AH battery later on. All of these batteries will power any of the Dewalt tools, however on certain tools such as the brushless 16 gauge finish nailer it is a better weight and balance to use the smaller batteries. For the Drills I like the smaller 2AH batteries unless you need longer runtime. For any of the bigger more demanding tools it really makes a difference to use the 5AH ones. Hope this helps it can get a little confusing compared to Dewalt 18 volt batteries and tools.
How long can it run while ime trimming until I would recharge it again and does it have other attachment?
Bob rock on Jul 30, 2016
BEST ANSWER: That depends on the battery used. Dewalt offers (5) 20v batteries that vary in Amp Hours. To acquire the longest run time, we would recommend purchasing the 5 amp hr battery (model DCB205) that could extend your run period for 60-65 minutes depending on how it's used.
Will regular 18v batteries work with this tool or do they have to be 20v lithium ion?
Shawn on Jul 18, 2016
BEST ANSWER: no, the battery has to be 20V to work with the tool
Can you also reference the battery and charger that goes with this item? I would need to purchase those separately correct?
donna on Jun 7, 2016
BEST ANSWER: Home Depot has a kit with the trimmer "Tool" , charger and one 5AH Battery for $199.99 I just picked it up along with a few others. I am not sure if the deal they had is still going on but they offered an additional 3AH Battery for free with the Trimmer Kit I bought there. I highly recommend this trimmer from Dewalt; the ability to walk around the yard without a cord attached and without having to deal with a gas powered engine and still obtain this amount of power really makes the chore of trimming your lawn kind of fun. Buy one you won't be disappointed, and Definitely try to use the 5AH Batteries over the lower amp ones, This greatly improves the run time & performance of this tool.
Will the 20 v battery used to power other tools work in the weedeater
Julie on May 6, 2016
BEST ANSWER: The battery can be used with any compatible 20v Max unit.
Will it wok with a 40V or even the 60V battery?
A shopper on Aug 9, 2018
BEST ANSWER: No only 20 volt battery’s
How long will the battery last,?
Tom V on Jul 15, 2018
BEST ANSWER: About 30 Minutes
what is the nut size of the head?
harry b on Jun 24, 2018
BEST ANSWER: The nut size is 1/2”
what is the warranty
Dan on Jul 25, 2016
BEST ANSWER: Dewalt tools comes with a 3 year warranty.
How do you change the weed eater string?
A shopper on Jul 25, 2018


Warranty Information

Black & Decker Lawn & Garden Electric Tools

Warranted for two (2) years from date of purchase. This warranty does not cover damage resulting from negligent handling, misuse or lack of reasonable maintenance and care. (Proof of purchase maybe required).