WEN
WEN 20839 20V 19-Inch Cordless Brushless Lawn Mower: Detailed Spec Analysis
The WEN 20839 is a capable cordless push mower powered by a brushless motor, offering quieter, more efficient operation and longer lifespan than brushed alternatives. Its 2-in-1 design doubles as a mulcher or bagger, and twin 5Ah lithium-ion batteries deliver up to 49 minutes of combined runtime , enough to cover yards up to 10,300 sq ft. It's best suited for flat suburban lots where cord-free convenience, zero emissions, and near-zero maintenance are the priority.
As an Amazon Associate, we earn from qualifying purchases. This does not affect our analysis or recommendations.
Last updated: . Based on our analysis of 364 lawn mowers.
What Sets It Apart
Key specification highlights based on our analysis.
Foldable Handle
Compact storage (98 of 364 mowers have this)
Why We Recommend It
- 01.
Comes with two 5Ah 20V lithium-ion batteries and a dual-port charger , no extra purchase needed
- 02.
Brushless motor design reduces friction and heat, improving performance and extending motor lifespan significantly
- 03.
5 cutting height positions between 1.5-3.2 inches cover most residential grass types and seasonal needs
- 04.
Lightweight at 41.9 lbs with a foldable handle for compact storage in tight garages or sheds
- 05.
Zero direct emissions and quieter than gas , friendlier for early-morning mowing and eco-conscious users
Considerations
- 01.
19-inch cutting deck means more passes on larger properties compared to 21-22 inch decks
- 02.
49-minute runtime is adequate but may require a mid-mow battery swap on the upper end of the 10,300 sq ft coverage range
- 03.
No self-propelled drive , requires full manual push effort, which can be tiring on uneven or inclined terrain
Technical Specifications
| Feature | Specification |
|---|---|
| Mower Type | Push |
| Power Source | Battery |
| Cutting Width | 19" |
| Blade Type | Rotary |
| Cutting Height | 1.5" – 3.2" |
| Height Positions | 5 |
| Battery | 20V 5Ah |
| Runtime | 49 min |
| Discharge | Mulch, Bag |
| Weight | 41.9 lbs |
| Foldable Handle | Yes |
| Start Type | Push button |
Power & Performance
The WEN 20839 runs on a 20V brushless motor, which is a meaningful upgrade over brushed designs , the brushless motor delivers more consistent performance across battery discharge cycles, generates less heat, and extends overall lifespan. For typical residential lawns with cool- or warm-season grasses at moderate growth, this motor provides adequate cutting torque.
It will handle normal conditions well but may bog down in very thick or wet grass where higher-voltage (40V+) systems have an edge.
Cutting System
The 19-inch rotary deck with a single blade keeps the mower compact and nimble around obstacles. Five cutting height positions span 1.5 to 3.2 inches, covering the recommended range for most common grass types including fescue, Bermuda, and Kentucky bluegrass.
The 2-in-1 discharge system lets you mulch clippings back into the lawn as natural fertilizer or collect them in the 0.52-bushel rear bag , a practical combination for seasonal flexibility.
Drive & Handling
This is a push mower at 41.9 lbs, which is on the lighter end for a battery mower with dual batteries onboard, making it relatively easy to maneuver on flat ground. The adjustable handle height accommodates different operator heights, and the foldable design reduces the footprint for storage.
On level or gently sloping terrain it handles well; steep hills will require notable effort given the lack of self-propelled drive.
Battery / Fuel
WEN includes two 20V 5Ah lithium-ion batteries and a dual-port charger in the box , a standout value inclusion. Combined runtime is rated at approximately 49 minutes, which is competitive for this voltage class.
The dual-port charger means both batteries can recharge simultaneously, minimizing downtime between sessions. As with all lithium-ion systems, battery performance will degrade slightly in cold weather below 40°F, so plan mowing sessions accordingly.
Who Is This Mower For?
Ideal For
- ✓ Homeowners with flat yards up to roughly 1/4 acre who want cord-free mowing without dealing with gas or oil
- ✓ Eco-conscious users who want zero direct emissions and quieter operation that won't disturb neighbors
- ✓ Low-maintenance seekers , no spark plugs, no fuel stabilizer, no pull-cord; just charge and mow
- ✓ Storage-limited households that need a compact mower with a foldable handle that tucks away easily
Not Ideal For
- ✕ Owners with hilly or sloped terrain who need self-propelled assist to reduce push effort
- ✕ Large property owners over 10,300 sq ft who need a wider deck or longer runtime to avoid multiple charge cycles
- ✕ Users with thick, overgrown, or heavily thatched grass that may demand the sustained torque of a higher-voltage or gas-powered mower
Assembly is required out of the box but is typically limited to attaching the handle, installing the grass bag, and charging the batteries , most users report completing setup in under 30 minutes. The push-button start means there's no priming or choke to configure.
Charge both batteries fully before first use using the included dual-port charger to ensure maximum runtime on your initial mow
Fold the handle for storage immediately after use to keep the footprint minimal and protect the handle hinge over time
WEN typically backs their outdoor power equipment with a 2-year warranty covering manufacturing defects , verify current warranty terms directly with WEN or your retailer at time of purchase, as coverage details may vary by region or sales channel.
FAQ
Does the WEN 20839 come with batteries, or do I have to buy them separately?
Two 5Ah 20V lithium-ion batteries and a dual-port charger are included in the box , no separate battery purchase needed. This is one of the better value propositions in this tier class, since battery bundles alone can cost nearly as much as the mower.
How long does the battery last on a single charge, and is 49 minutes enough for my yard?
WEN rates the runtime at approximately 49 minutes combined across both batteries. At a 19-inch cutting width, that's enough to cover up to around 10,300 sq ft under normal conditions.
If your yard is close to that upper limit, plan to swap batteries mid-mow or charge one while using the other.
What is the advantage of a brushless motor on a lawn mower?
A brushless motor has no physical brushes wearing against internal components, which means less friction, less heat, and a longer overall lifespan compared to brushed motors. It also draws power more efficiently from the battery, which translates to better performance and runtime, especially as the battery charge drops.
Can the WEN 20839 mulch and bag, or does it only do one?
It's a 2-in-1 mower , operation doubles as either a mulcher that shreds clippings back into the lawn, or a rear bagger with a 0.52-bushel collection bag. You switch between modes by installing or removing the bag and adjusting the rear discharge cover.
There is no side-discharge option listed.
What cutting height settings are available, and can I cut at 3 inches for Bermuda or fescue?
The mower offers 5 cutting height positions between 1.5 and 3.2 inches. That range covers the recommended mowing heights for most common residential grass types , you can set it at the upper end for fescue (typically 3-4 inches) or lower for warm-season grasses like Bermuda (1-2 inches).
Note the maximum is 3.2 inches, which is slightly below the ideal high-cut for some cool-season varieties.
Is this mower good for small yards, or is it better for larger properties?
The 19-inch deck and battery runtime make it best suited for small to medium yards , WEN rates it up to about 10,300 sq ft per charge. For smaller suburban lots under 1/4 acre it's an excellent fit.
For larger properties you'd benefit from a wider deck or higher-voltage platform to reduce the number of passes and charging stops.
Bottom Line
The WEN 20839 delivers a well-rounded cordless mowing package for small to mid-size flat yards: a long-lasting brushless motor, two 5Ah batteries with a dual-port charger included, and flexible 2-in-1 mulching and bagging. Buyers who want low-maintenance, zero-emissions performance without paying a premium for a big-brand name will find strong value here.
Those with hilly terrain, thick grass, or larger properties over 10,300 sq ft should look at self-propelled or higher-voltage alternatives.
Best for flat suburban yards up to 1/4 acre where cord-free, low-maintenance, eco-friendly mowing is the priority.
Consider alternatives if you have sloped terrain, consistently thick or wet grass, or a yard larger than 10,300 sq ft that demands more power or longer runtime.
Check Price on AmazonAs an Amazon Associate, we earn from qualifying purchases. This does not affect our analysis or recommendations.