40V Cordless Lawn Mower Compatible with Dewalt 2x20V MAX Battery, 14 Inch Electric Lawn Mower with 35L Grass Bag, 6-Position Height Adjustment, Foldable Push Mower for Yard (Tool Only) Review

Overview

The DEWALT 40V Cordless Lawn Mower is a compact, battery-powered push mower designed for small to medium-sized yards. Unlike most DEWALT outdoor tools that run on their 20V MAX platform, this mower uses a unique 40V system but is compatible with two 20V MAX batteries (sold separately). It’s best for homeowners with up to 1/4 acre of grass who already own DEWALT 20V tools and want a lightweight, quiet, and gas-free mowing solution that stores easily.

Who Should Buy This

• Homeowners with small, flat yards (under 1/4 acre): The 14-inch cutting deck is narrow enough to maneuver around flower beds and tight corners, but too small for a half-acre lot without frequent battery swaps.
• DEWALT tool loyalists: If you already own a collection of DEWALT 20V MAX batteries and chargers, this mower (tool only) is a cost-effective addition. You can use your existing batteries to power it.
• Apartment or condo dwellers with small patches of grass: Lightweight at under 30 pounds and folds flat for vertical storage, this mower is easy to carry up stairs or stash in a closet.
• Anyone tired of gas engine headaches: No oil changes, no stale fuel, no pull cords. Just insert batteries, press a button, and mow silently (well, as silent as a mower gets).

Key Features Breakdown

40V Power System (Compatible with Dewalt 2x20V MAX Battery) This mower accepts two 20V MAX batteries in series to create 40V of power. That means you can use your existing DEWALT batteries—but only if they’re the 20V MAX type (not the older 18V). The trade-off: runtime depends entirely on the amp-hours of the batteries you own. A pair of 5Ah batteries gives about 25–30 minutes of mowing on a typical lawn.

14-Inch Cutting Deck This is a small deck. Great for precision trimming around gardens and fences, but you’ll make more passes on open lawn areas. It’s best for yards with lots of obstacles or for people who want a mower that feels more like a trimmer on wheels.

35L Grass Bag The bag holds about 9 gallons of clippings. That’s small—expect to empty it every 5–8 minutes of mowing on dense grass. For a small yard, it’s manageable. For anything larger, you’ll be making frequent trips to the compost pile.

6-Position Height Adjustment You can set cutting height from about 1 inch to 3 inches using a single lever. The range is sufficient for most cool-season and warm-season grasses, but the lowest setting won’t scalp a lawn (which is actually a good thing for grass health).

Foldable Design The handle folds down without tools, and the mower stands upright for storage. It takes up about half the floor space of a traditional mower—perfect for garages or sheds already packed with bikes and boxes.

Pros

1. Lightweight and easy to push: At roughly 28 pounds, you can lift it with one hand. No struggling over bumps or slopes.
2. Quiet operation: At about 75 decibels, you can mow early Saturday morning without waking the neighbors. Gas mowers typically hit 90+ dB.
3. Zero emissions: No fumes, no gas can smell, no oil spills on your garage floor.
4. Uses your existing DEWALT batteries: If you’re already in the DEWALT ecosystem, this saves you the cost of a dedicated battery platform.
5. Compact storage: Folds flat and stands upright, taking up minimal space in a corner or on a wall hook.
6. Simple height adjustment: The single-lever system is quick and doesn’t require bending down to adjust each wheel individually.

Cons

1. Batteries not included, and they’re expensive: This is a “tool only” purchase. A pair of DEWALT 20V 5Ah batteries plus charger can cost $150–200. Factor that into your total price.
2. Small cutting deck: 14 inches means more passes. For a 1/4 acre lawn, you’re looking at 45–60 minutes of mowing time (including bag empties).
3. Tiny grass bag: The 35L bag fills up fast, especially in thick or damp grass. You’ll be emptying it constantly.
4. Not for thick or tall grass: The 40V system lacks the torque of a gas engine. If you let your lawn get over 6 inches tall, you’ll stall the blades or need to raise the deck and make multiple passes.

Bottom Line

The DEWALT 40V Cordless Mower is a niche tool that excels for one specific buyer: the DEWALT fan with a small, tidy lawn and a stack of 20V batteries already on hand. At $179.99 (tool only), it’s a reasonable price for a lightweight, quiet, and easy-to-store mower—but only if you already own the batteries. If you’re starting from scratch, the total investment (mower + two 5Ah batteries + charger) pushes you past $350, which buys a more powerful gas mower or a better-equipped battery mower from a brand like EGO or Ryobi. For tight spaces, small yards, and DEWALT loyalists, this is a solid pick. For everyone else, look for a kit with batteries included.

Frequently Asked Questions

Can I use my existing DEWALT 20V MAX batteries with this mower? Yes, but you need two of them. The mower accepts two 20V MAX batteries (any Ah rating) and runs them in series to produce 40V. Note: It will not work with a single 20V battery. Both slots must be filled for the mower to operate.

How long will the batteries last? Runtime depends on your battery capacity and grass conditions. With two 5Ah batteries, expect 20–30 minutes of continuous mowing on a typical lawn. With two 2Ah batteries, you’ll get about 10–15 minutes. Thick, wet, or tall grass drains batteries faster.

Does this mower mulch or side-discharge? It comes with a rear grass bag only. There is no mulching plug or side-discharge chute included. If you want to leave clippings on the lawn, you’ll need to remove the bag and let the mower blow clippings out the back—but it’s not designed for efficient mulching.