DEWALT DCMW290H1 40-Volt Brushless Mower Review | 3-in-1 Cordless Lawn Kit

Price the DEWALT DCMW290H1 40-Volt Brushless Mower Review | 3-in-1 Cordless Lawn Kit on Amazon:
DEWALT Battery Lawn Mower – The DEWALT DCMW290H1 is the new 40-volt 20″ lawnmower the can mulch, bag or discharge the clippings out of the rear of the mower.  Currently, the 40-volt line is designed more for landscapers and contractors and the rear discharge would go along with that, allowing for easy use around seed beds and landscaping.  The 40-volt battery line-up is currently available in 4.0Ah, 6.0Ah, and 7.5Ah battery packs.  The battery pack included with this mower is a 6.0Ah pack.  The DEWALT 40V MAX Lawn Mower is rated by Dewalt to cut up to 1/4 acre and from our testing, the runtime equates to about 12-14 minutes for an average height cut.   There is a single lever that allows the user to adjust the height of the cut from 1.5″ to almost 3.5″.  The wheels do have ball bearings in them and the build quality seems good.  The metal deck is thin to be lightweight but also seems strong.  The 40-volt battery used in this mower is comparable with the other DEWALT 40-volt outdoor power equipment.

Brushless motor for high power output & runtime
3-in-1: mulching, bagging, and rear discharging
20 in. metal deck
Single lever height adjustment from 1.5 – 3.4 in
Folding handle and lift handles for easy transport and compact storage
40-Volt Performance
Since the DEWALT 40-volt battery is designated for commercial use in DEWALT’s line-up of outdoor power equipment, we have some pretty high expectations for this mower.  The large battery pack contains 3 sets of cells that each equal 40-volts.  That is many more cells than the 20-volt line or even the FlexVolt line that is 60-volt.  Even with the larger battery pack, the DEWALT 40-volt lawn mower is only able to run for about 12-14 minutes on one charge of a 6.0Ah battery pack.  For most city lots, that would mean a homeowner would need to have at least 2 batteries.  A landscaping contractor should easily be able to trim a yard and charge the battery again on their way to the next job.  That would not be the case if it was a larger commercial job.

The lawn mower power is amazing and maybe what is killing some of the runtimes.  We were able to cut 12-18″ grass with very few stalls and no overheating of the 40-volt 6.0Ah battery.  There is always a balance between power and runtime and this unit definitely has more power.  That is a good thing if this lawn mower would be used as a trimmer.  Ditch banks and taller grass is no challenge for this mower.  We will go out on a limb and say that this is the most powerful battery operated mower we have ever used.  The long grass we cut in the video shows the jaw-dropping performance this mower provides.

Build quality seems to be right up at the top of the pack with a nice metal deck that is both strong and lightweight.  The deck is deep to allow the grass to mutch effectively and also bag well.  There are two positions for the push handle that accommodate both shorter and taller users.  Storage of this lawn mower is simple and effective as it can store standing up, therefore taking up a 1/4 of the ground space of a similarly sized gas mower.

Overall, this mower seems to have the power for normal mowing but lacks just a bit in the runtime category.  It is priced right, so one could pick up another battery compared to the price of the closest competitor, the EGO 56-volt.  DEWALT came out swinging with this mower and constructed it very well!


Lord Ba'al says:

12 minutes? There’s others that have triple that run time.

Joe Framer says:

Great review,informative….always quality videos,thanks.

Josh Bartlett says:

***owner review***

This review is spot on. It is a quality build and it feels like a true Dewalt tool that you would come to expect. It cuts very well and I was impressed with the bagging feature. However, the run time is horrible. With the bag on I was only getting 12 minutes of run time. It takes up to 2 hours to recharge for just another 12 minutes of run time. That to me is unacceptable for a $400 mower.

I’ve cleaned it up and will be putting it back in a box to head back to the store here shortly. This is the first Dewalt tool I’ll be returning to the store.

Dewalt, please improve the run time. This is a great idea and really good quality but not up to speed with the run time from your competitors.

Mr Bailey says:



Which mower would you recommend the Kobalt 80 volt versus the DeWalt 40-volt? I am on the fence of getting the DeWalt except the run time is what kills it for me. The Kobalt 80 volt has 2 Amp Hour batteries versus the DeWalt has a 6 amp hour batteries

allen speed says:

20v mower has two 5ah, total 18650 cells 20. 40v mower hay 30 cells with the 6.0 and 7.5 batteries.

james jones says:

I have 36 volt dewalt batterys will it work with these

Stephen Dixon says:

I’m trying to decide between this, Kobalts 40 volt and Ryobis 40 volt. I have a .30 acre lot. What would you go with?

JeeperJimbo 1990 says:

I do have a question I’ve looked at one of these mowers personally i thought the wheels were flimsy @ 3:09 min on your video it shows what i found the wheels don’t seam strong at all …. You can see how they lean in your video …. Awesome review as always !! Just seems like this model was rushed but it does look like dewalt with a few small changes will be a top runner is the battery market !

Mark Bartlett says:

Hey guys, i need some advice please. Looking at buying the Dewalt DCD796 combi drill. I’ve got 2 prices – £140 with 2x 4AH batteries or £185 with 2x 5AH. Should i pay an extra £45 for the 2 bigger batteries (1ah difference) just for DIY. What u think?

Tommy and Eric 4130 says:

just got this mower waitn on the battery to charge ,prior i always used a side discharge gas mower for my small town home yard which of the 3 ways do you recommend using this mower ? mulching,rear discharge,or bagging? which way seems to work best? i will post back on my experience and run times once i get it goin thanks for any input on which of the 3 ways works best comming from a side discharge gas mower.

William Todd says:

For bagging you really need a high lift blade, the blades that are on most of today’s mowers are what they call a 3 in 1 blade, they don’t do any of those tasks very well so its best to have the right blade for your specific type of mowing, whether it be mulching, side discharge, or bagging…side discharge and bagging you really need a good high lift blade to throw those clippings, where with mulching you want the blade to create a cyclonic action to toss the clippings up under the deck and keep doing so to keep chopping them into finer and finer pieces in which a dedicated mulching blade is the way to go.

Could you throw a high lift blade on that lawn mower and do your bagging test again and see what it does?

Joni English says:

IF you LOOK AT THE STIHL ELECTRIC MOWER RMA510 wheels look the Same !!!!!!!!!!!!!!!
Deck looks the Same !!!!!!!!!! CLONE !!!!!!!!of a Stihl

Aaron Repper says:

Come on Milwaukee make me a lawnmower and include a 12.0 ah or two.

Russ Webster says:

Good review Brian. But the dog was my favorite part of the video. #WORKSHOPADDICT

Joy Kwiatkowski says:

Love your dog …

EOSJOE says:

Interesting. DeWalt has two nearly identical push mowers, one takes (2) 20V and the other takes (1) 40V battery. They cost the same and they both get similar short run times. Seems very confusing to the consumer. I saw a review of the 20V version on another site and they never even mentioned that there was a 40V single battery version. The built quality does seem nice. It’s a shame the batteries are $200.

Joy Kwiatkowski says:

Really surprised they didn’t go 60v

They Live says:

40 volts just does not have the run time of a 56 volt of the same amp hour never mind the power.  12 minutes of runtime is not worth it even if you had 3 batteries set aside most people would still not buy this, its to niche.  I think if dewalt ramped down the power setting it would last longer and had a ramp up mode.

George Washington says:

Don’t know why anybody makes a steel deck these days. Honda provided years ago that plastic decks can be made to last, and don’t rust

superspeeder says:

Uh, 12 minutes on well maintained grass? I live in an end unit townhouse and it takes me longer than that to cut my lawn. I can’t imagine many people cutting smaller lawns than mine.

I can cut my lawn twice on a single charge of my Ego 5Ah battery, though.

scott d says:

Great review, thanks. Ruff ruff.

Jms Fabrication says:

Great review. Do you know how big (HP or Wattage) the motor is on this unit?

Joy Kwiatkowski says:

Which would you prefer ego 56 or dewalt 40

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