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08 of 10 Battery push & self-propelled · Walk-behind

Greenworks

80V 21 in. LM2108S

Greenworks 80V 21 in. Brushless Self-Propelled (LM2108S)

$699.99 MSRP Nav Walk-behind Verified

6.9/10 Score

It cuts like a gas mower and the rear-wheel self-propel is genuinely good, but plan on a second 4Ah battery for anything past a quarter acre and treat the plastic drive gears gently.

Where it sits 08 of 10 overall 01 of 1 in Battery push & self-propelled field median 7.3

Model no. LM2108S
Cut width
21in
Runtime per charge
33min
Weight
75lb

Drawn from the spec sheet: ¼-acre reference lot (walk-behinds are not lawn-rated) · slope not rated · 21 in passes, so far fewer of them · you push it, so the rows are yours. Manufacturer ratings, not our measurements.

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Amazon link · we earn a commission if you buy · $699.99 MSRP · Amazon price not shown

Reliability30% weight
6.5
Performance25%
7.0
Usability20%
7.0
Value15%
8.0
Support10%
6.0

cut = score, 5–10 in half-point notchesuncutdry patch = weakestbattery push & self-propelled median, n 1

Scoring note

Reliability 6.5 (30%): plenty of 3–5 year owners with no failures, but the plastic-gear failure theme and some battery replacements inside the warranty window keep it from scoring higher. Performance 7.0 (25%): cut quality and gas-like power are consistently praised, but the manufacturer's 33-minute runtime on one 4Ah pack is below the category norm and owners say a second battery is needed for typical yards. Usability 7.0 (20%): variable-speed RWD and vertical folding are strong, 40-minute recharge is quick, but 75 lb is heavy and one editorial review found the rear flap binds when pulling the mower backwards. Value 8.0 (15%): an 80V self-propelled kit with 4Ah battery and charger for less than the EGO and Ryobi 40V HP equivalents. Support 6.0 (10%): 4-year tool and battery warranty is above average, but no replacement gears, a lost-registration report, and only anecdotal responsiveness. Weighted total 6.9 (6.90).

Recommended for

and where to walk past it

Recommended for

  • Your lawn is a quarter acre or less, or you already own a second 80V battery
  • You want gas-level power and rear-wheel self-propel without the maintenance, for less than EGO or Ryobi
  • You are already on, or plan to build out, the Greenworks 80V tool platform

What backs it

  • Owners across Best Buy, Slickdeals and forum threads repeatedly say power matches or beats a comparable gas mower, especially with the 3200 RPM turbo
  • Variable-speed rear-wheel drive and the vertical EZ Fold storage are the two most-praised usability points
  • 4-year warranty on both the tool and the battery, backed by an 80V platform with 75+ tools

Not where

  • You mow tall or wet grass regularly — the plastic gearbox gears are the recurring failure point
  • You need more than about 30 minutes of runtime per charge from a single included battery
  • You want a light mower to lift or carry; this one is 75 lb

What counts against it

  • Manufacturer runtime is only 33 minutes on the included 4.0Ah battery; multiple owners say you need two batteries for a normal yard
  • Recurring reports of plastic gears in the blade/drive gearbox breaking on wet or overgrown grass, with no replacement gear sold
  • At 75 lb it is heavy for a 21-in battery mower, and one reviewer found the rear flap catches when pulling it backwards

Known issue

from owner reports, not the marketing page
Known issuePlastic gearbox gears strip when pushed through wet or overlong grass, and Greenworks sells no replacement gear for them Slickdeals · owner thread
Owners sayPower comparable to or greater than a 160cc-class gas mower, including in thick or damp grass Amazon reviews, Best Buy reviews
Owners warnBattery longevity is mixed: several 3-year owners report packs still like new, while one owner replaced two 80V packs within about two years Best Buy reviews

How this score was built

Manufacturer ratings, not our measurements.

Built from 9 sources: 4 owner threads, 1 hands-on review, 1 video, 3 spec pages.

We don't sell these and we don't run them. The score is the weighted result of five factors read from the sources above; specs last checked Sep 13, 2026. How the five factors are weighted →

Specifications

Last verified Sep 13, 2026
Cut width
21 in
Cut height range
1.38–4.0 in, 7 positions (single-lever)
Drive
Rear-wheel drive, variable speed self-propelled
Battery
80V 4.0Ah lithium-ion (1 included) + charger
Runtime per charge
Up to 33 min (manufacturer, with included 4.0Ah battery; 40-min recharge)
Deck material
Steel
Bag capacity
60 L
Weight
75 lb (manufacturer product page)
Noise
n/v — no primary source read
Warranty
4-year limited tool warranty + 4-year limited battery warranty

Manufacturer ratings, not our measurements. 1 value read from no primary source is shown as n/v rather than guessed. The retailer's page is the one that counts at checkout.

Sources

9 cited
  1. 01

    SpecGreenworkstools

    LM2108S / SKU 2550402 product page: 21 in steel deck, 7 heights 1.38–4.0 in, 4-in-1, 3200 RPM, up to 33 min runtime on 4.0Ah, 40-min recharge, 60 L bagger, 75 lb, LED headlights, EZ Fold, 4-yr tool + 4-yr battery warranty; sale-priced and sold out on the brand site

  2. 02

    SpecGreenworkstools

    Support page for LM2108S/2550402; the 'Owner's Manual' PDF it links is a 56V LM2130SP manual (wrong document), so no dB or manual weight figures usable

  3. 03

    SpecGreenworkstools

    Older 3-in-1 kit LM2138S / 2515902 (the MO80L410 generation): 45 min runtime, 71.65 lb, 1-3/8 to 3-3/4 in, 60 L, '60% quieter than gas'; out of stock, used to distinguish generations

  4. 04

    OwnerAmazon reviews

    Current-generation (LED headlight) 4.0Ah + charger kit: 4.7/5 from 537 ratings on 2026-09-10; the listing does not show a model number

  5. 05

    OwnerBest Buy reviews

    2544802 / MO80L413 kit, 4.5/5 from 726 reviews: praise for power, variable-speed self-propel, 60-min recharge, vertical storage; complaints that one battery is short for more than ~0.28 acre and one defective charger replaced quickly

  6. 06

    OwnerSlickdeals

    Apr 2025 thread: 3-year owners mostly happy; two batteries replaced in 2+ years and lost warranty registration; plastic gears break on wet/long grass with no replacement part; 'need 2 batteries for a normal sized yard'; drive-shaft rust

  7. 07

    OwnerSlickdeals

    Apr 2024 thread: 'more power than my gas mower'; one DOA unit that beeped and stopped, another owner fixed the same symptom by reseating the battery; minor cosmetic QC complaints

  8. 08

    Hands-onThe Lawn Review

    Hands-on review of a dual-port 80V 21 in: excellent cut, power on par with a Honda gas mower, but rear flap caught when pulling backwards, turbo cut out, auto battery switchover failed; 55% approval

  9. 09

    VideoYouTube

    CARVER ADVENTURES, 'Greenworks 80V Mower Review After 2 Years of Use' — title and channel verified, not watched in full

Alternatives

the nearest rival in the field

07 of 10Boundary wire

Gardena

Sileno City 250

7.0/10 Score

The quietest mower we track and the right size for a small urban lawn — provided you accept a weekly clean and a fiddly first setup.

vs. the 80V 21 in. LM2108SSupport +2.0Value −1.5Reliability −0.5

Not rated for this yard

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Amazon link · we earn a commission if you buy · No official US price for this EU-first model · Amazon price not shown

80V 21 in. LM2108S

6.9/10 · Greenworks

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