Model#: DEWNDCST920P1

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Dewalt DCST920P1 20V MAX 5.0 Ah Li-Ion Brushless String Trimmer

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  • Dewalt DCST920P1 20V MAX 5.0 Ah Li-Ion Brushless String Trimmer
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Product Overview


The DCST920P1 20V MAX 5.0 Ah Cordless Lithium-Ion Brushless String Trimmer is part of Dewalt's outdoor line of products that are fueled by powerful motors providing the runtime and performance that landscapers demand without dealing with the nuances of gas powered products.
  • 13 in. cut swath get rids of grass and weeds quickly
  • Lightweight and compact design minimizes fatigue
  • Variable trigger with two speed control ranges between 0 - 4,000 and 0 - 6,000 RPM allowing you to choose the proper speed to match your trimming task
  • Dual 0.080 in. line with bump feed
  • 20V MAX Cordless Lithium-Ion Brushless String Trimmer - DCST920P1
  • 20V MAX 5.0 Ah Lithium-Ion Battery - DCB205
  • 20V MAX Lithium-Ion Battery Charger
  • Auxiliary Handle and Guard
  • 0.080 in. Line Pre-wound in Spool
Compliance and Restrictions
warning: --


Cordless: Yes
Weight: 8.5 lbs.
Batteries Included: 1
Battery Amp Hours: 5.0 Ah
Battery Type: Li-Ion
Cutting Width: 13 in
Drive Shaft Style: Straight
Drive Shaft Type: Fixed
Handle Type: Wrap-Around
Line Diameter: 0.08 in
Line Feed System: Semi-Automatic
No-Load Speed (RPM): 0 - 6,000
Speed Settings: 2
Voltage: 20V



4.3 / 5.0
97 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (56)
No, I would not recommend this to a friend (1)
Powerful (43)
Lightweight (42)
Easy To Use (18)
Value (10)
Short Run Time (if applicable) (3)
Uncomfortable to Use (2)
Lack of Power (1)
Best Uses
Frequent Use (12)
Small Projects (8)
Large Projects (1)
Home Repair (1)
Not good
Less than a year old and worked well - now the entire trimmer head is loose and I cannot get it tight so when running the entire assembly turns around. Some how the battery is also jammed in the trimmer and won’t release. Going back to gas.
April 26, 2019
Originally posted at
Solid cordless trimmer
I was reluctant to jump from gas powered to electric but we were in process of purchasing our first home and the yard was very small.

I have several Dewalt 20V Max tools- driver, drill, jig saw, and reciprocating. I considered every major manufacturer's cordless options, but kept coming back to this because I had a stack of 20V Max batteries already. Our last rental home had over 2/3 acre, our new home has just over 1/10th. I figured I'd always have a backup battery in case the included one didn't last through cutting the grass.

Was I ever wrong. Not only did the included battery last through trimming 150+ yards of chain link fence on the old house, it easily trimmed the rest of the yard, and even ornamental grass- all on the a fully charged 5.0 ma 20v battery. That same battery has become the go-to for all of my other Dewalt 20V Max tools- especially on the saws.

My only complaint and the only reason why I didn't give five stars: the trimmer string is a little lightweight for its power, and I had to re-spool twice after trimming the chain link fence. Heavier gauge line or a poly blade would be a good option for this tool.

I'm looking forward to adding the hedge trimmer and blower in the spring
This review was collected as part of a promotion
November 16, 2018
Originally posted at
Works for me but...
I purchased unit at Tractor Supply because it was on sale. I have used 4 times and like:
no having to mix fuel
quick charge of battery
unit ready to use out of box

do NOT like:
small deflection guard... it allows material to deflect on ankles while trimming
lack of additional attachment options
October 16, 2018
Originally posted at
Guard too small
The guard on the trimmer does not protect you from debris, it’s too small.
My shins have grass and small sticks inbedded in them...I bleed every time I trim the lawn.
Hit between the eyes with a rock today while edging my driveway. Trimmer turned upside down.
This didn’t happen with my last weed eater.
Cuts fine, battery life average.
Expected more from DEWALT.
September 20, 2018
Originally posted at
Tool works well but only received 1 battery
I purchased this tool with and extra battery that never showed up. I have a small area that I cannot get to with a lawn mower and this was the correct tool for the job.
September 12, 2018
Not the usual reliability of Dewalt tools.
My garage if full of Dewalt tools so it was only natural that I got this trimmer. It may have lasted 2 months of light trimming before it overheated and died and I got a gas trimmer to keep up. Honestly I forgot about it until I cleaned my shed and realized I had forgotten to repair the trimmer. After quite a bit of research I found that it was redesigned because Dewalt found a defect that caused early failure. Im still within my 3 year warranty but will have to drive well over an hour to a service center and pay to have it converted to the updated and redesigned motor. Come on guys, really???
August 28, 2018
Originally posted at
Motor heats up too fast
During my first time using this trimmer, the motor abruptly stopped after 30 minutes of use. Switched out batteries and it would run from 1-5 minutes before abruptly stopping again. I'd let it cool for a few minutes to get another 1-2 minutes of use. Motor heats up way too fast and I can't use it.
August 27, 2018
Originally posted at
The manual has a different string head
I guess I will be getting my money back. The string trimmer head is completely different than the one in the manual. Not willing to play guessing games on how to load it. All of the youtube videos on the subject are the older type in the manual. Mine is a type 4. I am disappointed. The tool had potential.
August 26, 2018
Originally posted at
Runs 15 minutes
Trimmer runs for 15 minutes then shuts down. Battery still has one bar left. Has happened two out of the three times I've used it. Great trimmer if you have a small yard ( mine is .20 acre). Will plan trimming around trimmers problem and have repaired after grass season.
August 13, 2018
Originally posted at
20 volt string trimmer disappointment
I have used the trimmer for a total of maybe 10 times, just filed the line for the 3rd time, and the plastic where the head attaches to the shaft has cracked. I have in no way abused the trimmer. It is still holding tight but I was disappointed with this happening. I love the trimmer but I'm not sure it's going to last. I only use the Dewalt trimmer line as the unit came with.
August 12, 2018
Originally posted at

Questions & Answers

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Browse 15 questions Browse 15 questions and 20 answers
Does it come with a 20 volt battery and charger?
Daniel P on Jun 25, 2017
BEST ANSWER: yes, it comes with both a battery and charger. I.e. everything you need to start using it when it arrives.
How long is the 20V MAX 5.0Ah Cordless Lithium-Ion Brushless String Trimmer?
JBo on Jan 15, 2016
BEST ANSWER: Yes from end to end when ready for use the length is 67-15/16". With battery off the unit is 66" long. This was done putting the rotating hub on a hard surface and measuring from that surface vertically to the end. Should be +/-1/8" or better accuracy.
Matt O'Brien
VICTOR ENGINEERING / O'Brien Concept and Solution
9316 Davenport St.
Omaha, NE 68114
Will the new flex volt battery make it stronger and run longer?
A shopper on Jul 7, 2017
BEST ANSWER: Yes , it will increase the run time dramatically; it will not necessarily make it that much stronger; the flex volt battery will just deliver a more consistent output to the motor for a longer period of time; in other words the trimmer with a fresh charged 5.0 Ahr batt will have the same cutting power that a flexvolt would have after 30 minutes of use; the bigger flex volt batt just increases run time.
Will it work with impact battery?
A shopper on May 21, 2017
BEST ANSWER: Yes , it will work with any of the DEWALT 20v batteries including the new Flex volt battery.
Just got the Dewalt 20v MAX 5 Ah String it! Although I was wondering If I can use my other 20v MAX 3 Ah batteries I use with my Dewalt Drill and Skill Saw without harming the battery?
Jamey T on Apr 26, 2017
BEST ANSWER: Yes I think it is fine to use it. It just won't last as long when you use it.
Is the battery new or reconditioned when purchasing the reconditioned tool?
Tigerbacker70 on Apr 6, 2016
BEST ANSWER: The batteries are not guaranteed to be new. Generally, the batteries are the same batteries that were returned with the trimmer. The manufacture has tested the batteries and guaranteed them for a year.
Could anyone help me how to replace the string.
Rene on Aug 7, 2015
BEST ANSWER: Turn spool clockwise to unlock as shown in Figure 9. The
white nub inside the spool will rotate away from the spool
window to indicate it is unlocked.Pull the spool straight out to remove.
Remove any dirt and grass from the spool and housing.
5. First, wind new line in the channel of the spool closest to the
holding slots (10C) as shown in Figure 10.
6. Place the end of the cutting line
FIG. 11
(10A) into the retaining hole
Wind the cutting line onto the
spool in the direction of the
arrow on the bottom of the
spool. Make sure to wind the
line on neatly and in layers. Do
not crisscross (Fig. 11).
8. When the wound cutting line
reaches the beginning of the
holding slots (10C), cut the line
approximately 4 inches (106 mm).
Will this work with my other Lith- ion batteries from Dewalt?
Jo Jo on Jul 20, 2015
BEST ANSWER: The Dewalt 20V MAX 5.0 Ah Cordless Lithium-Ion Brushless String Trimmer only works with 20 volt batteries.
Can you use other amp hour battery with this? like the ones for the drills and impacts?
DD on May 2, 2015
BEST ANSWER: Yes,all of the 20v max tools will accept any amp hour batteries.
Where does this ship from?
James on Apr 27, 2015
BEST ANSWER: This item ships from our CPO warehouse in Lawrenceville,Ga. 30046

New Vs. Reconditioned

What's the difference between New and Factory-Reconditioned?

Factory-Reconditioned products have been returned to the manufacturer and are restored to like-new operating condition; they go through a rigorous testing and inspection process. Plus, they offer a significant savings vs. new.
  • Reconditioned products may have minor cosmetic blemishes or scratches that do not affect item performance.
  • Reconditioned products may not come with all of the consumables the new version comes with (bits, sanding pads/papers, cases, etc.).
  • Both come with a manufacturer warranty and are covered by our Money Back Guarantee; New is 30 days, Reconditioned is 120 days.
Condition: New Factory Reconditioned
Features: Same Same
Specs: Same Same
Includes: 20V MAX Cordless Lithium-Ion Brushless String Trimmer - DCST920P1,
20V MAX 5.0 Ah Lithium-Ion Battery - DCB205,
20V MAX Lithium-Ion Battery Charger,
Auxiliary Handle and Guard,
0.080 in. Line Pre-wound in Spool
20V MAX Cordless Lithium-Ion Brushless String Trimmer - DCST920P1R,
20V MAX 5.0 Ah Lithium-Ion Battery - DCB205,
20V MAX Lithium-Ion Battery Charger,
Auxiliary Handle and Guard
Availability: In Stock Out of Stock
Warranty: 3 Year Limited 1 Year Limited


Most DEWALT® Tools purchased on or after January 1, 2004 come with a warranty package that includes:

Three-Year Limited Warranty. DEWALT will repair, without charge, any defects due to faulty materials or workmanship for three years from the date of purchase. This warranty does not cover part failure due to normal wear or tool abuse. For further detail of warranty coverage and warranty repair information, visit or call 1-800-4-DEWALT (1-800-433-9258). This warranty does not apply to accessories or damage caused where repairs have been made or attempted by others. This warranty gives you specific legal rights and you may have other rights which vary in certain states or provinces.

One-Year Free Service Contract. DEWALT will maintain the tool and replace worn parts caused by normal use, for free, any time during the first year after purchase.

90-Day Money Back Guarantee. If you are not completely satisfied with the performance of your DEWALT Power Tool, Laser, or Nailer for any reason, you can return it within 90 days from the date of purchase with a receipt for a full refund - no questions asked.