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Model#: BDKNCM2040

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

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


Cordless: Yes
Weight: 43.5 lbs.
Bag Capacity: 15 gal.
Batteries Included: 2
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



4.5 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend?
Yes (4)
Lightweight (4)
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 20, 2015
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 26, 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 7, 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 18, 2016

Questions & Answers

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Browse 8 questions Browse 8 questions and 11 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.
Does this mower use the 2 batteries as sequential or parallel? Or does it use one battery and the second as an automatic backup when the first battery runs out? Is the charger furnished capable of charging both batteries at the same time or only one at a time?
DonD13 on Jul 12, 2015
BEST ANSWER: The Black & Decker 40V Cordless 20 in. Lawn Mower uses one battery at a time with the second baery being the backup.
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.


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).