Model#: BDKNCM2040

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 or Recon 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

Black & Decker CM2040 40V Cordless 20 in. Lawn Mower

Sale Price:
You Save
Free Shipping
(continental U.S.)
In Stock
Ships Monday
  • Due to federal regulations, this product can only be shipped within the continental US. Express delivery not available. RANKED #3 BY LEADING CONSUMER MAGAZINE!


The 40V MAX Cordless 20 in. Lawn Mower provides ample power for any overgrowth. With two 40V MAX 2.5 Ah Lithium-Ion batteries included, this lawn mower offers 30 to 45 minutes of mowing time. This is a 3-in-1 mower that handles mulching, bagging, and side discharging. A variable speed motor allows battery conservation for greater efficiency and longer runtime. Its EdgeMax deck design allows cutting up to the edge of fencing and flower beds, providing a fast means to a clean lawn. A 6-setting height adjustment enables users to choose a height of cut between 1-1/2 in. to 4 in. to cut all types of grass.
  • 3 modes for a variety of cuts
  • Variable speed motor for battery conservation
  • EdgeMax deck design for close up edge cutting
  • 15 gallon nylon grass collection bag for overseeing fill levels
  • 6-setting height adjustment for a variety of cut heights
  • 40V Cordless 20 in. Lawn Mower - CM2040
  • (2) 40V MAX 2.5 Ah Lithium-Ion Batteries
  • (1) 15 Gallon Nylon Grass Collection Bag
Compliance and Restrictions
warning: Cancer and Birth Defect/Reproductive Harm --


Cordless: Yes
Weight: 43.5 lbs.
Bag Capacity: 15 gal.
Batteries Included: 2
Battery Amp Hours: 2.5 Ah
Battery Type: Li-Ion
Cutting Height (Max.): 4 in.
Cutting Height (Min.): 1-1/2 in.
Cutting Height Settings: 6
Cutting Path: 20 in.
Deck Material: ABS Polymer
Discharge Settings: Side / Rear
Drive System: Manual
Mulching Capability: Yes
Power Type: Electric
Recharge Time (Full Capacity): 2 hrs.
Voltage: 40V



4.3 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (6)
Lightweight (5)
Easy To Use (2)
Powerful (1)
Value (1)
Short Run Time (if applicable) (1)
Best Uses
Small Projects (1)
Works well, but
Adequate power. Lasts long enough for my small yard. Cuts well, and doesn't bog down where I wouldn't expect it to. I've been mowing lawns my whole life and have killed plenty of gas powered mowers by pushing them too hard into too tall grass. Other reviewers mentioning lack of power are waiting too long to cut their grass and not cutting at an appropriate height.

However, one huge issue is that it's terrible at mulching. Might as well not mulch at all. It leaves huge pieces of grass, very disappointed in this one aspect.
August 19, 2018
Originally posted at
Black & Decker is always three stars max
This was bought for a relatively small lawn that needed a very light weight machine. The height was set and remains on the second highest setting and this is the only mower ever used on a brand new lawn from seed which, here in California, is mowed weekly for 9 - 10 months out of the year. It has just enough power to cut the grass well but does "bog" down (electric) where the grass gets thick. Also, it is very inconsistent with picking up debris such as twigs and pulled weeds with a tap root. One of the batteries has been replaced as it stopped charging after about six months for some unknown reason and the flap at the back of the deck broke off. Am currently trying to find the parts to fix it myself. Still, it is mowing the lawn fine and is super light weight and that is what was important. Finally, I love that it folds up nice and compact for tidy storage. If you have a good sized or even averaged sized lawn I would stay away from this mower and get one that is self propelled, unless you are looking for a little bit more excercise. Where it asks if I would recommend to a friend I am putting "no" but it really all just depends on the lawn.
July 18, 2018
Originally posted at
Works Great and Great Value
This mower is super simple to use and it works very well. I think for the price it maintains excellent value for what you get out of it.
March 1, 2018
Originally posted at
Yes, I would recommend this to a friend
Easy To Use
Battery Longevity (if applicable)
Light and powerful
Much easier to mow, store and transport than the 24 volt Blavk and Decker I've used for the past 7 years.
October 8, 2016
over 2 years ago
Describe Yourself:
Avid Do-it-Yourselfer
Yes, I would recommend this to a friend
Great Mower!
This mower is not a toy by any means! It does a great job cutting the grass and weeds. Like all B&D tools that I have owned, it takes a licking and keeps on ticking.

Putting this mower together takes all of 5 minutes. Just attach the upper handle and adjust the angle, and then clip in the side discharge device.

The foam piece that covers the handle started to tear and disintegrate the second time I used it. I always wear gloves, so it's not a big deal.

It comes with 2 2.5 AH 40v batteries. Each lasts about 15-20 minutes. Like all of the B&D batteries, they have to cool off a bit before you can recharge them.

The mower has a compartment to keep the second battery so that you don't have to go back for it. I'd advise against that because it will keep the battery too warm on a hot day. You're better off making a trip back to your charger and setting it in the shade so that it can start to cool down while you use the second battery.

If you have other B&D 40v batteries, they work just fine but don't last as long. The 2.0 AH lasts maybe 12-15 minutes, and the 1.5 AH lasts about 8-10 minutes.
June 27, 2016
Yes, I would recommend this to a friend
Easy to own
Mower is easy to get out ,use, and put up. The batteries charge quickly and are easy to install and remove.The blade cuts evenly,when the grass is dry the bag works well.
May 8, 2016
Yes, I would recommend this to a friend
Easy to push
I use it to mow only about 2500 square feet, one battery easily mows that ammount.lightweight mower handles nicely and battery is very easy use and to charge.having multiple tools that use the same battery is convenient.
April 19, 2016
Yes, I would recommend this to a friend
It's easy to mower and light weight........................T
It's easy to mower and light weight. Thanks!
July 21, 2015
40V 20" Cordless Mower Review
This is an excellent cordless mower with plenty of power for deeper grass. Folds up nicely. Very light even with the battery in. Plastic deck is very easy to clean off.
May 21, 2015
Originally posted at

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 9 questions Browse 9 questions and 10 answers
Does the mower come with the charger?
Mark on May 4, 2016
BEST ANSWER: Yes the mower comes with a charger
Sent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone
where is the battery? do you remove battery to charge it? or do you charge the mower? if you remove the battery, where is the charger and does it cost extra. can you buy it without the bagger?
outtheroader on Mar 17, 2015
BEST ANSWER: The battery located under dark cover on the top&front of mower. The separate charger and 2nd battery are included. There are no option to buy without collection bag.
Does the included charger have a circuit to prevent over-charging?
Bruce on Jul 3, 2016
BEST ANSWER: No, it does not.
What is the proper way to charge the batteries? Do I charge after I've mowed the lawn or wait until I'm ready to mow again?
Liza on Apr 18, 2016
BEST ANSWER: Li-Ion batteries do not have a battery memory, either charging method will suffice.
How many charge and recharge cycles from the battery pack?
C Wayne on May 7, 2015
BEST ANSWER: The charge cycles are going to vary from user to user, depending on how many times it is used, is the battery fully depleted when it is put on the charger, is the battery left on the charger hours days at a time after it has fully charged. So, it is very difficult for me to give you an accurate number or charge cycles for a battery
do you sell a self propelled model?
Jack on Apr 19, 2015
BEST ANSWER: The Black & Decker SPCM1936 36V Cordless 19 in. 3-in-1 Self-Propelled Lawn Mower is the only Black And Decker cordless mower available.
Does the 40V cordless 20in. lawnmower come in the self-propelled?
Hope on Mar 18, 2015
BEST ANSWER: No,not at this time for the 40v 20" self propelled.
My brand new mower will not start. Battery is charged. Why will it not start?
A shopper on Oct 26, 2017

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: 40V Cordless 20 in. Lawn Mower - CM2040,
(2) 40V MAX 2.5 Ah Lithium-Ion Batteries,
(1) 15 Gallon Nylon Grass Collection Bag
(2) 40V MAX 2.5 Ah Lithium-Ion Battery Pack,
Nylon Grass Collection Bag
Availability: In Stock Out of Stock
Warranty: 2 Year Limited null


Warranty Information

Black & Decker Tools and Home Products

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).