Mowers
EGO LM2135SP vs Greenworks LM2108S
One of these ships 31% more energy. The other tells you 31% more about itself. That is genuinely the whole comparison.
Affiliate disclosure: we earn a commission if you buy through our links, at no extra cost to you. It never changes which product we rank first — here is how we're funded.
We have not tested these units. Every spec on this page comes from the manufacturer's own documentation and is linked to it. Every computed figure is arithmetic you can redo. Prices are checked daily — last verified September 27, 2026. Here is exactly how we pick.
These are the two flagship 21 inch cordless mowers most likely to end up on the same shortlist, and both have their own review on this site. Put their spec sheets next to each other and the comparison resolves into one question: do you want more battery, or more information?
The short answer
The two spec sheets, side by side
| Spec | EGO LM2135SP | Greenworks LM2108S | Advantage |
|---|---|---|---|
| Deck | 21 in | 21 in | Tie |
| Battery in the box | 56V 7.5Ah | 80V 4.0Ah | Tie on packs |
| Watt-hours (nameplate) | 420Wh | 320Wh | EGO, by 31% |
| Runtime claim | Up to 60 min | Up to 33 min | EGO |
| Acreage rating | Not published | Up to 1/2 acre | Greenworks |
| Charge time | Not published | 40 min | Greenworks |
| Weight | Not published | 75 lb | Greenworks (publishes it) |
| Blade speed | Not published | 3200 RPM | Greenworks |
| Cutting force figure | Up to 7.0 ft-lbs torque | Not published | EGO |
| Cut height | 1-4 in, 8 positions | 1.38-4.0 in, 7 positions | EGO |
| Deck modes | 3 interchangeable lower blades | 4-in-1 incl. turbo leaf pickup | Greenworks |
| Warranty | 5-yr tool / 3-yr battery | 4-yr tool / 4-yr battery | Split |
Transcribed from each manufacturer's own product page, cited below. 'Not published' means the figure is absent from that page, not that we could not find it.
The energy gap, and what it costs to carry
EGO puts 31% more nameplate energy in the box. It also claims 82% more runtime. Those two numbers do not scale together, which tells you something about the machines.
A heavier self-propelled machine drives a heavier machine. We cannot prove that is the whole explanation, because EGO publishes no weight to compare against — but 75 lb is the one hard number in the vicinity of the gap.
The half acre only one of them claims
Greenworks rates the LM2108S for up to half an acre. EGO rates the LM2135SP for nothing. That is not a small omission: acreage is the figure a buyer actually shops on, and the brand with more battery is the one that declines to state it.
The warranty split, and which year is worth more
EGO covers the tool for 5 years and the pack for 3. Greenworks covers both for 4. Add them up and EGO looks ahead by a year. Look at which component fails and the ranking flips: a brushless motor in a sealed deck rarely dies in year four, and a lithium pack often begins to fade there.
Greenworks is the only brand in our registry whose battery warranty matches its tool warranty, and we think that is the more useful of the two five-year promises.
Who should buy the EGO
Lawns near or over half an acre, and anyone who expects the mower to be the first of four or five EGO tools. 420Wh is the largest included pack of any flagship walk-behind here, eight cut-height positions from 1 to 4 inches is the widest published range, and three interchangeable lower blades cover mulching, high-lift bagging and extended runtime.
Buy it knowing EGO publishes no weight, no charge time and no acreage rating for this machine.
#ad Check the EGO Power+ 21" Select Cut LM2135SP price on Amazon — how we're funded.
Who should buy the Greenworks
Quarter to half acre, and anyone who would rather have a spec sheet than a slogan. It is the only mower in our registry publishing blade speed, weight, acreage and charge time on one page, the 40 minute recharge is the fastest here, and the 4-in-1 deck adds turbo leaf pickup on top of mulch, bag and side discharge.
Buy it knowing 320Wh is the least energy of the flagships, and that 75 lb is not light.
#ad Check the Greenworks 80V 21" 4-in-1 LM2108S price on Amazon — how we're funded.
Deciding in three steps
- Measure the grass, not the lot. Under a quarter acre, both are more mower than you need.
- Between a quarter and a half acre, take Greenworks: it is rated for it and recharges in 40 minutes.
- Over half an acre, take EGO for the 420Wh, and accept that you are buying on a number the maker will not put an acreage against.
Both machines have full reviews here — the EGO LM2135SP and the Greenworks LM2108S — and the four-way flagship table is in the mower brand comparison. The platform-level version of this decision, which outlives either mower, is EGO vs Greenworks.
What we cannot tell you
We have not mowed with either machine. EGO publishes no weight, no charge time and no acreage rating, so three rows of the table above are one-sided. Neither maker publishes a decibel figure or a deck material. Neither states the grass conditions behind its runtime claim. And the 0.66 acre figure for the EGO is our inference from a Greenworks rating, not a claim either company makes.
The products discussed
Specs are the manufacturer's own and linked to the page they came from. Prices come from a live daily check; where we have no verified price we say so rather than print a stale one.
EGO Power+ 21" Select Cut LM2135SP
EGO · EGO 56V ARC Lithium · Our score 9.1/10
#ad Price as of September 27, 2026. Prices change; we check daily. How we're funded.
The most watt-hours in the box of any flagship walk-behind here, on the platform with the widest tool range to grow into.
Published specs
| Deck | 21 in |
|---|---|
| Cutting torque | Up to 7.0 ft-lbs |
| Battery included | 56V 7.5Ah |
| Cut height | 1-4 in, 8 positions |
| Self-propel speed | 0.9-3.1 MPH |
| Runtime claim | Up to 60 min |
| Warranty | 5-yr tool / 3-yr battery |
Source: EGO POWER+ 21" Select Cut System (LM2135SP), egopowerplus.com
56V x 7.5Ah = 420Wh, using EGO's advertised pack voltage.
What the numbers favor
- 420Wh in the box -- the largest included pack of any flagship walk-behind on this page
- Eight cut-height positions from 1 to 4 in, the widest published range here
- Three interchangeable lower blades (mulching, high-lift bagging, extended runtime)
- 5-year tool warranty, the longest published on this page
What they don't
- EGO publishes torque (7.0 ft-lbs), not motor wattage, so it cannot be compared directly against Greenworks' 1500W figure
- The 7.5Ah pack that earns the runtime claim is also the expensive one to replace
your yard is under a quarter acre. You would be paying for 420Wh of headroom you will never discharge, and a 20 in push mower cuts the same grass.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Greenworks 80V 21" 4-in-1 LM2108S
Greenworks · Greenworks 80V · Our score 8.4/10
#ad Price as of September 27, 2026. Prices change; we check daily. How we're funded.
The only mower here that publishes motor wattage, blade RPM, weight and an acreage rating -- and the only one whose battery warranty matches its tool warranty.
Published specs
| Model / SKU | LM2108S / 2550402 |
|---|---|
| Deck | 21 in |
| Max blade speed | 3200 RPM |
| Battery included | 80V 4.0Ah |
| Cut height | 1.38-4.0 in, 7 positions |
| Runtime claim | Up to 33 min |
| Weight | 75 lb |
| Rated for | Up to 1/2 acre |
| Warranty | 4-yr tool / 4-yr battery |
Source: 80V 21" 4-in-1 Self-Propelled Lawn Mower (LM2108S), greenworkstools.com
80V x 4.0Ah = 320Wh, using Greenworks' advertised pack voltage.
What the numbers favor
- 4-year battery warranty -- a year longer than EGO's 3-year, on the component that fails first
- Publishes blade RPM, weight and acreage rating; the other two brands publish none of the three
- 40-minute recharge on the included charger, the fastest published here
- 4-in-1 deck adds turbo leaf pickup on top of mulch, bag and side discharge
What they don't
- 320Wh included, the least of the three flagships -- and the 33-minute runtime claim reflects that
- 75 lb is the only published weight here, and it is not light
you want one battery to finish a half-acre without a swap. Greenworks rates the mower for 1/2 acre but claims only 33 minutes on the included pack; those two numbers only reconcile if you buy a second battery.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Where to buy the tools on this page
Every link below is an Amazon affiliate link. We show no price we have not verified today, so where there is no live figure the link says "check price" and takes you to the listing to read it there.
Best overall
EGO Power+ 21" Select Cut LM2135SP
EGO · EGO 56V ARC Lithium
Best published spec sheet
Greenworks 80V 21" 4-in-1 LM2108S
Greenworks · Greenworks 80V
#ad As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. How we're funded.
Common questions
Is the EGO LM2135SP better than the Greenworks LM2108S?
Which mower runs longer on one charge?
How big a lawn will each one cut?
Which has the better warranty?
How long does each take to recharge?
Which is heavier?
Sources
Read next
- Mowers
Deck width sets how fast you finish. Watt-hours set whether you finish at all.
- EGO POWER+ LM2135SP review
A specification review: 420Wh in the kit, the widest cut-height range in our registry, and no published weight.
- Greenworks 80V LM2108S review
A specification review: every figure published, 320Wh in the kit, and a half-acre rating you can buy against.
- EGO vs Ryobi vs Greenworks vs Toro: the mowers compared
Every published spec from four flagship 21-inch mowers, converted so it is comparable.
- EGO 56V vs Greenworks 80V: higher voltage, smaller pack
80V beats 56V on paper. The included pack sizes reverse the result, and here is the math.
- Best battery lawn mowers of 2026
Six flagship battery mowers ranked on watt-hours in the box and energy spent per minute.