Model#: DEWNDCB404

What are the different product conditions?

Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 120 day money back guarantee
Open Box
New items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Dewalt DCB404 40V MAX 4.0 Ah Lithium-Ion Battery

  • Dewalt DCB404 40V MAX 4.0 Ah Lithium-Ion Battery
(See Price in Cart)
Free Shipping
(continental U.S.)
In Stock
Ships Tomorrow
  • Due to federal regulations, this product can only be shipped within the continental US. Express delivery not available.


The new Dewalt DCB404 40V MAX 4.0 Ah Lithium-Ion Battery is compatible with all Dewalt 40V MAX tools to give a running time unmatched by any competitor. Get the reassurance and dependability of power and durability you've come to expect from Dewalt.
  • Compatible with all Dewalt 40V MAX tools
  • 40V MAX 4.0 Ah Lithium-Ion Battery - DCB404
Compliance and Restrictions
warning: This product can expose you to Lead, which is known to the State of California to cause Cancer and Birth Defect/Reproductive Harm. For more information go to


Length: 7.25 in.
Width: 4.94 in.
Height: 5.38 in.
Weight: 3.53 lbs.
Battery Amp Hours: 4 Ah
Battery Style: Slide
Battery System: 40V MAX
Battery Type: Li-Ion
Compatible Models: All Dewalt 40V MAX Tools
Voltage: 40V



3.2 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (3)
Powerful (3)
Dead after less than a year and three uses
I bought a DEWalt Hedge Tripp - after all DeWalt is the best right? Maybe for tools, but apparently not so for batteries. This product died after three trimmings of a small hedge. Charger indicates battery is bad and won't charge it anymore.

Now the dilemma; do I spend the ridiculous amount of money it takes to replace this batter, or throw away a perfectly good hedge trimmer? Hmmmm.... Seems like a different hedge trimmer with a battery that will last is the more cost effective option.
March 29, 2019
Originally posted at
Useless Lithium battery.
This DeWalt 40V lithium battery is useless. I only used my blower 4 times. The battery died after a month of non-use. Tried charging but it does not go past first green light. So yeah batter is defective.
October 18, 2018
Originally posted at
Works Great!
I bought a blower ad this battery came with it. I seen on here where people have had bad luck with the battery. I have bought several DeWalt items and I have yet to have any issues with any Battery. I use my blower every time I mow my yard and the charge last for about 20 min. One thing people fail to do is keep the battery fully charged when not in use. I have a charging station where I leave my batteries in chargers all the time. Any battery you let go dead for any extended amount of time will kill any battery if left uncharged for long periods of time. I recommend that during the winter you charge the battery once a month or just leave on charger. I have batteries that are 3 and 4 years old and have had no issues with leaving on charger.
July 6, 2018
Originally posted at
Battery is defective
I love the tools like the blower my battery goes to, however I have 3 batteries for it, all of which will not charge. What are the odds that 3 batteries and 2 chargers would be defective you say? Going back to gas powered...I have $750 wrapped up in these 3 batteries...I could have bought gas for a gas blower for 25 years.
June 16, 2018
Originally posted at
Lousy battery, questionable week cutter
Purchased a DeWalt weed cutter in 2017 and used it 4-5 times. Battery is dead this year and would not recharge. A truly horrible product (the battery at least that I wouldn't recommend to anyone. The weed cutter did not always let out cutting string when procedure performed as directed.
June 15, 2018
Originally posted at
Defective battery
Came with one of the 40v tools I own. Dated 2016. Call DeWalt service center and told them it would not charge. Took it up to the service center and they filled out a warranty sheet. Did not have one in stock. Had to drop ship one to me.
May 16, 2018
Originally posted at
Works well
Happy with performance so far. Charges in 90 min.
January 14, 2018
Originally posted at
Yes, I would recommend this to a friend
Dewalt 40v 4Ah battery
Just got it, charged it up and it works in the tools it's made for. So I guess it does what it's supposed to do.
May 19, 2016
Yes, I would recommend this to a friend
Great stuff
Around the house and cool looking and easy to use
May 6, 2016
Yes, I would recommend this to a friend
What you would expect from Dewalt
Good power blows wet and muddy leaves out of the gutters.
May 1, 2016

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 2 questions Browse 2 questions and 2 answers
what is the maximum continuous dischage of this product?
samuel on Apr 27, 2016
BEST ANSWER: The run-time will vary based on the usage. A best case scenario is 35-65 minutes.
Can this battery be used with a DeWalt 20 volt tool?
Raj on Oct 15, 2015
BEST ANSWER: No,the 40 volt and 20 volt batteries are not compatible.