21 in. 2x20V Brushless Cordless Push Lawn Mower Kit

Features

  • High-efficiency cutting system with dual blades
  • Up to 100 minutes runtime using both included batteries in succession (per manufacturer test conditions)
  • LED dashboard showing battery state of charge, cutting system load, and blade end-of-life
  • 15-gauge steel deck
  • One-touch telescoping/folding handle for vertical storage
  • Single-point 6-position height adjustment
  • Quieter operation compared with comparable gas mower (manufacturer claim)
  • Bag fills up to approximately 95% before emptying

Specifications

Cutting Width 21 inches
Deck Width 21 in
Battery Voltage 20V (x2 in series)
Battery Amp Hours 10 Ah (each)
Number Of Batteries Included 2
Batteries/Charger Included (2) 10 Ah batteries and (2) chargers
Battery Run Time (Manufacturer) 100 minutes (using both included batteries in succession, test conditions apply)
Charge Time 5 hours
Motor Brushless
Number Of Blades 2
Deck Material 15 gauge steel
Cutting Options Mulch, Bag, Rear Discharge
Cutting Height (Positions) 6-position single-point adjust
Maximum Cutting Height 4 in
Minimum Cutting Height 1.5 in
Power Type Battery
Recommended Yard Size 1/2 - 1 Acre
Intended Terrain Flat
Start Type Push button start (safety key / bail required)
Mower Type Manual push (not self-propelled)
Included Items Mower, two 10 Ah batteries, two chargers, bagger, rear side discharge chute, mulch plug
Warranty 3 Year Limited Warranty; 1 Year Free Service; 90-Day satisfaction guarantee
Returnable 90-Day

21-inch cordless push lawn mower with a brushless motor designed to run from two 20V batteries in sequence. It uses a two-blade cutting system and a steel deck. The unit supports mulching, bagging and rear discharge, has a single-point height adjustment, and a folding handle for more compact storage. A dashboard provides battery and system status indicators.

Model Number: DCMWP234U2
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DeWalt 21 in. 2x20V Brushless Cordless Push Lawn Mower Kit Review

3.7 out of 5

Why I reached for this mower

I’ve been steadily moving my yard over to battery power, and the last holdout was the mower. I wanted a 21-inch deck, true mulching capability, and a design that wouldn’t eat half the garage. This DeWalt 21-inch mower checks those boxes on paper: dual blades, a steel deck, a single-lever height adjust, and a handle that collapses with one button and stores vertically. After a season of weekly cuts and a handful of out-of-routine tests, here’s how it actually performs.

Setup and first impressions

Out of the box, it’s straightforward. The telescoping handle locks with one touch, the mulch plug clicks into the rear port, and the safety key lives under the dash. Two 20V 10Ah packs drop into the top; the mower uses them one at a time and automatically switches when the first is depleted, so there’s no mid-mow battery shuffle.

The LED dashboard is a nice surprise. I appreciate the quick battery state-of-charge display and the load indicator that spikes when you hit dense patches. There’s also a blade life indicator—handy as a nudge to check sharpness, even if you still want to inspect the edge yourself.

The deck is 15-gauge steel, which lends the machine a reassuring solidity compared to plastic-deck competitors. That said, more on the wheel hardware later.

Ergonomics and controls

The single-point, six-position height adjuster is one of the reasons I like using this mower. One lever moves all four wheels from 1.5 to 4 inches. I mostly cut cool-season turf at 3.25–3.5 inches, then drop to 3 inches when growth surges. The handle has three usable heights via its telescoping mechanism and folds flat in seconds for vertical storage—a small joy when garage space is tight.

It’s a push mower (no self-propel), and you feel that on longer sessions. On flat ground, the weight balance is good and it rolls easily. On slopes or bumpy sections, you will earn your stripes. The push-button start and bail work as expected, and blade stop time after releasing the handle is quick.

Cutting performance and cut quality

The dual-blade setup is the headline feature, and it delivers a fine, even cut across most of the deck. In normal weekly mowing—dry turf, 1/3-of-the-blade rule respected—the clippings are finely chopped and disappear into the canopy. When growth gets away from you or you hit thick, lush patches, the motor audibly ramps, which helps keep blade speed up, but you can still leave some speckling of clippings. You’ll clear that up by slowing down a touch or doing a second pass, but it’s not the “vacuum-cleaner” effect a strong gas unit can produce in heavy conditions.

Bagging performance is decent. The rear-mounted bag fills impressively full—around 90–95% in my experience—so you make fewer trips to the compost bin than you might expect from a battery mower. Wet clippings and very lush spring growth will still challenge the chute; that’s the nature of the beast. The included rear discharge chute works, though I mostly used mulch or bag.

This isn’t a stump-puller; it’s a residential battery mower. If you regularly mow tall, wet, or wildly uneven areas, expect to modulate your pace and take a second pass in the toughest spots. On the flip side, in typical weekly maintenance, it’s clean, consistent, and kinder to turf than throttling a high-vacuum gas deck.

Power and runtime

The headline runtime is “up to 100 minutes” on the two included 10Ah packs. In real use, I saw the following:

  • Weekly maintenance cut at 3.25 inches, dry turf: around 80–90 minutes total, leaving a little in the second pack.
  • Lush late-spring growth or slightly damp conditions: 55–70 minutes total.
  • Light fall cleanups with a higher cut and some leaf mulching: roughly 70–80 minutes.

The key is that it uses the two batteries in succession. You never swap mid-mow, and when the first pack drops, the mower flips to the second without a hiccup. Plan on one full session for 1/4 acre with margin or a careful 1/2 acre if you mow regularly and don’t let grass get too tall. If you’re routinely covering a half-acre plus, or you prefer a brisk pace, a self-propelled model or a spare battery set would be the better fit.

Charging is the tradeoff. With the included chargers, a 10Ah pack takes roughly five hours to refill. You do get two chargers, so both batteries can be topped in parallel overnight. That’s perfectly workable if you mow on a schedule and charge between sessions; not ideal if you want to do back-to-back cuts on the same day.

Noise and experience

The noise drop versus gas is significant. It’s not whisper-quiet—you still have blade noise over turf—but there’s far less engine bark and almost no vibration. I can carry on a conversation without shouting and won’t hesitate to mow in the morning when temperatures are friendlier.

Storage and maintenance

This is where battery mowers shine. The vertical footprint is small, and the handle design makes it as effortless as advertised. With the deck cleaned out and the batteries pulled, the mower tucks against a wall and stays put.

Maintenance is simple: keep the deck clean, inspect and sharpen/replace blades, and store batteries properly. The dashboard’s blade indicator helps, but you’ll still want to sharpen based on your turf and soil conditions. The steel deck handles the occasional stick or pine cone better than plastic.

A note on durability: while the deck itself is stout, the rear wheel mounts are stamped and not connected by a full-width axle. I haven’t broken anything, but I have noticed a bit of flex if you whack a curb or drop a wheel into a rut. Treat the wheels like you would any stamped-steel assembly—don’t use them as leverage—and you should be fine, but I’d prefer a more robust axle design on a mower intended for 1/2-acre work.

What could be better

  • No self-propel: Fine for smaller, flat lawns; a workout on hills or longer runs.
  • Heavy-growth mulching: Good, not gas-tier. Plan your pace or raise the cut for a first pass.
  • Charge time: Two chargers help, but each 10Ah pack still takes time.
  • Wheel hardware: Functional but not as confidence-inspiring as the steel deck.

What it gets right

  • Dual-blade cut quality: Clean, even results in regular conditions.
  • Runtime: Two 10Ah packs get most homeowners through a session without swapping.
  • Dashboard: Clear battery and load info is genuinely useful; blade reminder is a bonus.
  • Storage: The one-touch folding handle and vertical storage are excellent.
  • Single-lever height adjust: Fast, positive, and accurate.
  • Quiet, low-vibration operation: Less fatigue and more neighbor-friendly.

Who it’s for

  • Homeowners with 1/4 to 1/2 acre of mostly flat lawn who mow on a schedule.
  • Anyone who values compact storage and a quieter, cleaner mowing experience.
  • Users already in the DeWalt 20V ecosystem who appreciate battery flexibility.
  • Mulch-first folks who want a tidy finish and are willing to slow down in the heaviest patches.

Who should look elsewhere: If you want to cut infrequently and still expect perfect one-pass mulching in dense, tall grass, or if you routinely tackle hills, a self-propelled gas mower—or at least a self-propelled battery unit—will make you happier. If you need same-day multiple back-to-back sessions, the slow charge cycle is a constraint.

The bottom line

The DeWalt 21-inch mower is a thoughtfully designed, quiet, and capable battery mower that thrives in regular, weekly maintenance. The dual blades and steel deck deliver a quality cut, the dashboard adds genuinely useful feedback, and the storage experience is best-in-class. It’s not a torque monster, and the lack of self-propel plus long charge times are real tradeoffs. I also wish the wheel hardware matched the deck’s sturdiness.

Recommendation: I recommend it for homeowners with up to a half acre of mostly flat lawn who value quiet operation, compact storage, and straightforward controls—and who mow regularly. If that describes your yard and routine, this mower makes the weekly cut easier and cleaner. If you want gas-like brute force, have steep terrain, or dislike the idea of a manual push, consider a self-propelled alternative.



Project Ideas

Business

Quiet Hour Micro-Mowing

Offer subscription mowing for small, flat lawns with early-morning/lunch-hour time slots, leveraging the quieter brushless motor. Include options: mulch for soil health or bag-and-haul for a tidy look. Route for density, use the LED dashboard to manage battery swaps, and store the mower vertically in a hatchback between stops. Market to noise-sensitive streets, WFH clients, and families with napping kids.


STR/Realty Curb-Ready Spruce-Up

Create a fast-turnover curb appeal package for short-term rentals and listings: mow, edge touch-up (with a separate battery trimmer), and bag removal in under an hour for small lots. The clean cut from dual blades photographs well, and the single-point height adjust ensures consistent results across properties. Offer pre-showing, open-house, and weekly STR schedules.


Leaf-to-Mulch Pickup and Delivery

Provide a seasonal service that picks up bagged leaves, shreds them finely using the mower on a tarp, and delivers dense, ready-to-use mulch back to clients’ beds. Fine particles from the two-blade deck break down faster. Price per bag processed or per cubic yard delivered; offer add-ons like bed top-offs and compost bay starts.


Eco HOA/Common-Area Maintenance

Pitch an all-electric maintenance plan for small, flat HOA strips and pocket parks: scheduled mowing, path definition, and clippings management. Quiet operation reduces complaints; bagging to ~95% capacity minimizes dump trips. Use standardized 2x20V batteries and two chargers to rotate packs overnight and maintain a weekly cadence with predictable costs.


Pop-up Neighborhood Mower Library

Run a weekend tool-lending program with brief safety/orientation sessions. Members reserve 1–2 hour slots, pick up the mower with a charged battery set, and return it for the next user while the second set charges. The one-touch folding handle makes transport easy in compact cars. Monetize via memberships, deposits, and optional delivery/pickup fees.

Creative

Lawn Labyrinth and Pattern Art

Lay out a simple maze or geometric stripes with string and stakes, then use the 6-position single-point height adjustment to vary grass height for visual contrast. The dual blades give a clean, even cut, and the quiet motor lets you work early or late without disturbing neighbors. Switch to bagging for crisp edges or mulching for blended gradients. The folding handle makes it easy to transport between yards for a neighborhood art walk.


Pollinator Patchwork Pathways

Design a yard with intentional no-mow micro-meadows and mowed walking paths. Keep paths at 1.5–2 in for definition, leave clover/flower zones at 4 in to support pollinators. Use the LED dashboard to pace the work within battery range, and the rear discharge for quick path maintenance without stopping. Create a seasonal plan that rotates which patches are mowed to stagger blooms.


Sheet-Mulch Garden Maker

Convert a section of lawn into fertile beds by mowing low, laying cardboard, and then mulching repeatedly with finely chopped clippings and shredded leaves. The dual blades produce finer mulch, and you can alternate bagging to move material and mulching to build layers. The steel deck handles repeated passes over leaf piles spread on a tarp to create uniform bedding material.


Neighborhood Compost Collective

Host a monthly clipping-and-leaf shred event. Neighbors bring bags of leaves; you spread them thin on a tarp and use the mower to finely shred for faster composting. Bag to 95% capacity for easy transport back to their bins or shared compost bays. Track battery usage on the dashboard to schedule swap-outs and keep the line moving.


Lawn-to-Crafts: Plant Paper and Natural Dye

Collect fresh clippings in bagging mode and blend with recycled paper pulp to make green-tinted handmade paper sheets. Dry flower petals and mow-shred them to create colorful inclusions. Use mulched leaves to brew gentle natural dyes for eco cards. The mower’s bag makes gathering consistent particle sizes easy for smoother pulp and dye extraction.