Battery Platforms
EGO 56V vs Greenworks 80V: higher voltage, smaller pack
Greenworks wins on voltage, warranty and published detail. EGO wins on the number that decides whether you finish the lawn.
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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 January 1, 1970. Here is exactly how we pick.
Greenworks 80V is the better-documented platform and EGO 56V is the better- equipped one. If you buy either flagship exactly as it ships, EGO finishes more lawn per charge. If you add a second pack to the Greenworks, the comparison flips and Greenworks costs less to keep alive.
Side-by-side: the flagship mowers
| Spec | EGO LM2135SP | Greenworks LM2108S |
|---|---|---|
| Deck width | 21 in | 21 in |
| Battery in the kit | 56V 7.5Ah | 80V 4.0Ah |
| Nameplate watt-hours | 420Wh | 320Wh |
| Published runtime | Up to 60 min | Up to 33 min |
| Cut height | 1-4 in, 8 positions | 1.38-4.0 in, 7 positions |
| Blade speed | Not published | 3200 RPM |
| Weight | Not published | 75 lb |
| Acreage rating | Not published | Up to 1/2 acre |
| Recharge time | Not published | 40 min |
| Warranty | 5-yr tool / 3-yr battery | 4-yr tool / 4-yr battery |
Sources: EGO LM2135SP and Greenworks LM2108S, both checked 3 September 2026.
The 80V catch nobody explains
So there are two effects stacked on top of each other: the Greenworks starts with less energy and spends it faster. Neither is a defect — the same deck that eats watt-hours is the one that picks leaves up — but it is why a straight voltage comparison misleads. If runtime is your priority, budget for a larger Greenworks pack from day one. Greenworks sells the same mower with an 8.0Ah pack and claims 80 minutes for it, which is exactly the arithmetic above running in reverse.
Spec transparency is a real differentiator
Count the "not published" cells in the table. Greenworks has none. EGO has three, including the weight of a mower you have to push.
That is not a trivial observation. When a manufacturer publishes blade RPM, weight, recharge time and an acreage rating, it is committing to numbers you can hold it to. When it publishes a torque figure and a runtime claim and nothing else, you are being asked to trust the marketing. For a buyer trying to make this decision on paper — which is how almost everyone makes it — Greenworks is simply the easier brand to evaluate honestly.
Warranty: read the battery line, not the tool line
EGO publishes 5 years on the tool and 3 on the battery. Greenworks publishes 4 and 4. The headline favors EGO; the useful number favors Greenworks.
Motors in brushless outdoor tools very rarely fail inside a decade. Lithium packs degrade continuously from the day they are made, and that degradation is the thing that ends a cordless tool's useful life. An extra year of coverage on the component that actually wears out is worth more than an extra year on the component that generally does not. We go into what actually kills a pack in how long these batteries last.
Recharge speed changes how you use the tool
A 40-minute recharge is fast enough that a single pack plus a coffee break covers a half acre. That is a genuinely different ownership experience from waiting two hours, and it partly offsets the smaller pack. EGO does not publish a charge time for this kit, so we cannot run the same sum for it — which is the transparency point again, in practical form.
Tool range
EGO's 56V line is the broader of the two and reaches higher: the same packs run a 42-inch zero turn, which Greenworks 80V does not match in the consumer range. EGO also runs a multi-head system where one power head drives a trimmer, an edger and a pole saw.
Greenworks answers with strong individual tools — its 730 CFM axial blower publishes 5.5 lb bare, the best airflow-per-pound figure we found anywhere — and with a 4-year warranty across the line. But be careful with the brand name: Greenworks runs 24V, 40V, 60V and 80V as separate, non-interchangeable platforms. "Buying Greenworks" commits you to nothing; buying Greenworks 80V commits you completely.
The verdict
Choose EGO 56V if
- You want the kit as sold to finish your lawn without a second pack
- A riding mower on the same battery is plausible within ten years
- You want the multi-head system for trimming, edging and pruning
Choose Greenworks 80V if
- You are willing to buy a bigger pack, and want the lower running cost
- The 4-year battery warranty matters to you (it should)
- You want to compare specs before you buy rather than adjectives
- A 40-minute recharge fits how you mow
One warning for either brand: check which voltage line the specific tool sits on before you buy the second one. That is the mistake that turns a platform into a drawer full of orphaned chargers — see our battery compatibility guide.
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 No verified live price right now, so we show none rather than a stale one. 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 No verified live price right now, so we show none rather than a stale one. 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.
Common questions
Is Greenworks 80V better than EGO 56V?
Are EGO and Greenworks batteries interchangeable?
Why does the 80V mower run for less time than the 56V one?
Which brand publishes more useful specs?
Does Greenworks 80V work with Greenworks 40V tools?
Sources
Read next
- Battery Platforms
Pick the system once and the next four tools are decided for you. Start here.
- 40V vs 80V: what the voltage on the sticker actually buys you
Volts x amp-hours = watt-hours. The one calculation that makes every battery spec comparable.
- EGO 56V vs Ryobi 40V: which platform should you start on?
420Wh in one pack against 480Wh in two, with the warranty and build-out cost worked out.
- Best battery lawn mowers of 2026
Six flagship battery mowers ranked on watt-hours in the box and energy spent per minute.
- How long do electric lawn mower batteries last?
Runtime per charge is arithmetic. Lifespan in years is mostly warranty terms and honest uncertainty.