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A battery lawn mower can handle everything from a small city lot to a sprawling suburban yard without gas, oil, or pull cords. The key factors are deck size, battery capacity, runtime, and whether you want a push or self-propelled model. Matching the mower to your lawn area helps avoid stopping mid-mow to recharge.
We looked at five cordless walk-behind mowers from WEN and Greenworks that cover a range of yard sizes and features. For more on choosing a mower by yard size and terrain, see our guide to selecting a lawn mower. If you are already invested in a battery system, our battery platform overview can help you pick compatible tools.
Every specification on this page comes from the manufacturer’s own product page, checked on 29 October 2026. We have not used these products ourselves, so the picks are based on published specifications only.
If you are deciding between push and self-propelled, read Push vs Self-Propelled Mowers. For a broader look at power sources, see Battery vs Gas vs Corded Garden Tools.
How we chose these
- Yard size: Match the mower’s stated acreage coverage to your lawn area so you can finish on a single charge.
- Battery and runtime: Higher voltage and amp-hour ratings generally deliver more power and longer runtimes, but actual performance depends on grass conditions.
- Deck size: Wider decks cut more grass per pass, reducing mowing time, while smaller decks are lighter and easier to store.
- Mulching and bagging: A 3-in-1 or 2-in-1 design lets you mulch clippings, bag them, or discharge to the side.
Manufacturer-stated runtimes and acreage are based on ideal conditions; thick or wet grass will reduce the area you can cover.
Comparison table
| Product | Deck Size | Battery | Max Runtime | Cutting Height | Mulching | Warranty |
|---|---|---|---|---|---|---|
| WEN 20839 | 19 in | 2x 20V 5Ah | 68 min | 1.5-3.2 in | 2-in-1 mulcher | 2 years |
| WEN 20835 | 15 in | 1x 20V 5Ah | 57 min | 1.0-2.6 in | Not stated | 2 years |
| Greenworks LM2104S | 21 in | 1x 40V 5Ah | 50 min | Not stated | 3-in-1 | 3 years |
| Greenworks LM2034 | 20 in | 1x 40V 5Ah | 60 min | Not stated | Not stated | Not stated |
| Greenworks GLM801601 | 21 in | 2x 80V 2Ah | 40 min | Not stated | 3-in-1 | 4 years |
Max runtime as stated by manufacturers; actual runtime depends on grass conditions and cutting height. Cutting height ranges are not provided for all Greenworks models.
1. WEN 20839 20V Max 19-Inch Cordless Brushless Lawn Mower: for yards up to 1/4 acre
WEN says this 19-inch mower uses a brushless motor and two 5Ah batteries to cut up to 10,300 square feet on a charge. It offers five cutting heights from 1.5 to 3.2 inches and includes a 13-gallon bag and mulching plug. The 8-inch rear wheels help navigate bumpy terrain, and the handle collapses for upright storage.
- Blade speed: 3100 RPM (WEN)
- Collection bag: 13 gallons (WEN)
Pros: Includes two batteries for extended runtime; mulching capability; large 13-gallon bag
Cons: Heavier than single-battery models; cutting height minimum 1.5 inches may not suit very short grass
Check the WEN 20839 20V Max 19-Inch Cordless Brushless Lawn Mower on Amazon
2. WEN 20835 20V Max 15-Inch Cordless Brushless Lawn Mower: for small yards up to 1/8 acre
According to WEN, the 15-inch deck and single 5Ah battery can handle up to 6,500 square feet. The brushless motor spins the 13-inch blade at 3300 RPM, and five height stops range from 1.0 to 2.6 inches. It has 6.3-inch rear wheels and an 8-gallon collection bag.
- Blade speed: 3300 RPM (WEN)
- Collection bag: 8 gallons (WEN)
Pros: Lightweight and compact; simple single-battery operation; lower cutting height minimum of 1.0 inch
Cons: Smaller deck and bag; mulching capability not stated; shorter runtime on one battery
Check the WEN 20835 20V Max 15-Inch Cordless Brushless Lawn Mower on Amazon
3. Greenworks 40V 21″ Cordless Battery Self-Propelled Lawn Mower LM2104S: for medium yards with slopes
Greenworks states this self-propelled 21-inch mower runs up to 50 minutes on a 40V 5Ah battery, covering up to 1/3 acre. It has a 3-in-1 system for mulching, bagging, or side discharge, and folding handles save storage space.
- Battery recharge time: 150 minutes (Greenworks)
- Folding handles reduce storage space by up to 70% (Greenworks)
Pros: Self-propelled drive eases effort on slopes; 3-in-1 versatility; large 21-inch deck
Cons: Cutting height range not specified; runtime limited to 50 minutes
Check the Greenworks 40V 21" Cordless Battery Self-Propelled Lawn Mower LM2104S on Amazon
4. Greenworks 40V 20″ Cordless Battery Push Lawn Mower LM2034: for flat medium yards
Greenworks describes this 20-inch push mower as having a 40V 5Ah battery with up to 60 minutes of runtime, suitable for up to 1/3 acre. The deck size is 20 inches, and the battery recharges in 150 minutes.
- Battery recharge time: 150 minutes (Greenworks)
- Deck size: 20 inches (Greenworks)
Pros: Longest runtime among these models at 60 minutes; simple push design
Cons: Mulching or side discharge not stated; cutting height not specified; warranty not stated
Check the Greenworks 40V 20" Cordless Battery Push Lawn Mower LM2034 on Amazon
5. Greenworks Pro 80V 21″ Brushless Push Lawn Mower GLM801601: for larger yards up to 3/4 acre
Greenworks says this 80V 21-inch push mower includes two 2.0Ah batteries for up to 40 minutes of runtime, covering up to 3/4 acre. It features a 3-in-1 design and a rapid charger that refills a battery in 30 minutes.
- Battery recharge time: 30 minutes per battery (Greenworks)
- Folding handles reduce storage space by up to 70% (Greenworks)
Pros: High voltage for more power; rapid charging; 3-in-1 capability; 4-year warranty
Cons: Runtime only 40 minutes with two small batteries; cutting height not specified; push only
Check the Greenworks Pro 80V 21" Brushless Push Lawn Mower GLM801601 on Amazon
Which one fits you
| Your situation | Look at | Why |
|---|---|---|
| You have a small yard (under 1/8 acre) | WEN 20835 | Compact, lightweight, and enough runtime for small lawns |
| You have a medium yard (1/4 to 1/3 acre) | WEN 20839 or Greenworks LM2034 | Larger deck and battery capacity cover more ground per charge |
| You want self-propelled assist | Greenworks LM2104S | Self-propelled drive reduces pushing effort on slopes and uneven terrain |
| You need mulching and bagging | Models with 3-in-1 or 2-in-1: Greenworks LM2104S, GLM801601, or WEN 20839 | Mulching returns nutrients to the lawn; bagging collects clippings for a clean finish |
Practical tips
- Consider your yard size to match the mower’s acreage rating, and remember that thick or wet grass can reduce the actual area you can mow on one charge.
- Check if the battery platform is compatible with other tools you own; both WEN 20V Max and Greenworks 40V/80V systems work with multiple yard tools.
- Look for adjustable cutting height if you mow different grass types; some models do not list their height range, so check the manual before buying.
- Runtime varies with grass conditions; having a spare battery can extend mowing time, and rapid chargers help minimize downtime.
Sources
Specifications from each manufacturer’s product page, checked 29 October 2026: WEN 20839 20V Max 19-Inch Cordless Brushless Lawn Mower, WEN 20835 20V Max 15-Inch Cordless Brushless Lawn Mower, Greenworks 40V 21" Cordless Battery Self-Propelled Lawn Mower LM2104S, Greenworks 40V 20" Cordless Battery Push Lawn Mower LM2034, Greenworks Pro 80V 21" Brushless Push Lawn Mower GLM801601. Makers can change specifications; check the product page before you buy.
