Greenworks 80V 21-Inch Review: LM2108S, MO80L410, and LMB401

Greenworks’ 80V line is the answer to a specific question: what if you care more about finishing the yard on one charge than about anything else? This review covers the three models that matter — the LM2108S self-propelled flagship, the MO80L410 value push mower, and the LMB401 push alternative — because the 80V family is really one battery platform with different drive and deck configurations bolted on.

Best for

• Half-acre yards where one-battery completion matters — the LM2108S’s 640 Wh pack is the single-battery answer for a half-acre cut, which is exactly the class where most walk-behinds need a second pack.
• Buyers who want 80V power without paying for self-propulsion — the MO80L410 puts the same 80V cutting power in a push configuration at a lower price band.
• Flat quarter-acre yards — the MO80L410’s typical 4.0Ah pack (320 Wh) sizes to about a quarter acre per charge by our math.
• Anyone who wants a 4-year warranty — Greenworks covers tool and battery for 4 years on these models, which is longer than Ryobi’s 3-year terms.

Not ideal for

• Buyers who want the widest tool ecosystem — Greenworks’ 80V platform, while solid, doesn’t match EGO’s 56V breadth or Ryobi’s 40V scale. Check the tool lineup before committing to the platform.
• Anyone who has to carry the mower — the LM2108S is the heaviest mower in this review at a listed 89.1 lb. The push models are lighter but still substantial.
• Small flat yards — a 640 Wh flagship on a 3,000 sq ft city yard is wasted money and garage space. The 24V and 40V lines are the right size for small lawns.

Why consider it

The 80V platform’s whole identity is energy. At 80 volts, Greenworks can fit more watt-hours into a single pack than a 40V or 56V system of the same amp-hour rating — and watt-hours, not voltage, is what predicts runtime. The LM2108S’s 8.0Ah pack works out to 640 Wh, roughly 50% more energy than the EGO LM2135SP’s 420 Wh pack. That’s the difference between finishing a half acre on one charge and swapping batteries halfway through.

The LM2108S is the self-propelled flagship: 21-inch deck, brushless motor, and Greenworks’ SmartCut power-save feature, which automatically adjusts blade speed to grass thickness to stretch runtime. Greenworks lists runtime up to 80 minutes and sizes the mower for up to three-quarters of an acre. The 4-year tool-and-battery warranty is a genuine strength — it covers the battery, which is the part that wears out first.

Biggest drawback

The 80V platform is the trade-off. It’s a smaller ecosystem than EGO’s 56V or Ryobi’s 40V — fewer tools share the packs, and the 80V batteries are heavier and pricier than their lower-voltage counterparts. If you’re buying into a platform for the long haul, that’s a real consideration. And the flagship is heavy: 89.1 lb listed, which puts it firmly in the Heavy Duty class. The 40V vs 80V comparison explains the voltage-versus-watt-hours trade-off in full.

What makes it different

1. The 640 Wh pack — the most energy on board of any walk-behind in this class. Runtime per charge is the LM2108S’s entire reason to exist.
2. SmartCut power-save — Greenworks’ automatic blade-speed adjustment that throttles up only when the grass is thick, stretching runtime on normal cuts.
3. The value path — the MO80L410 delivers 80V cutting power in a push configuration at a lower price band, which is a rare way to get flagship-class power without flagship-class cost.

The three models

LM2108S — the self-propelled flagship

The LM2108S is the pick if you want the most runtime per charge in a self-propelled walk-behind. The 640 Wh pack covers a half-acre cut on one battery, and the SmartCut feature stretches it further on normal grass. The counterweights are the 89.1 lb weight and the smaller 80V ecosystem. It’s the strongest single-battery answer for a half acre in this review.

MO80L410 — the value path

The MO80L410 is how you buy 80V cutting power without paying for self-propulsion hardware you may not need. It’s a 21-inch steel-deck push mower, typically bundled with a 4.0Ah pack (320 Wh) — check your listing, because kits vary. By our consumption math, 320 Wh sizes to about a quarter acre per charge. The trade is your legs: this is a push mower, which is the right trade on flat quarter-acre lawns and the wrong one past that. It’s the value pick in the best budget mowers guide.

LMB401 — the push alternative

The LMB401 is the lighter push option in the 80V line, for buyers who want 80V power in a machine that’s easier to handle than the self-propelled flagship. It’s a simpler machine — no drive system to maintain — and it keeps the full battery for cutting, which is the push-mower advantage. Confirm the exact battery configuration on your listing, because Greenworks’ 80V push kits vary.

The runtime math

The 80V family’s advantage is pure watt-hours. The LM2108S’s 640 Wh pack, at our planning estimate of roughly 25–35 Wh per 1,000 sq ft of turf for self-propelled mowing, covers a half-acre cut (about 15,200 sq ft of turf) at 380–530 Wh — comfortably inside one charge. That’s the single-battery answer for a half acre that most walk-behinds can’t give you. The MO80L410’s 320 Wh pack sizes to about a quarter acre, which is exactly the class it’s built for. The battery runtime guide walks through the full math.

Alternatives

• EGO LM2135SP — the all-round benchmark with better cut quality and a deeper 56V ecosystem, but less runtime per charge. See the EGO LM2135SP review.
• Ryobi RY40HPLM01K2 — dual 40V packs (480 Wh) at a lower price band with the largest big-box tool ecosystem. See the Ryobi 40V HP review.
• EGO LM2156SP XP — the premium one-battery half-acre answer with 560 Wh and 8.3 ft-lb of torque.

Verdict

The Greenworks 80V family is the right answer when runtime per charge is your top priority. The LM2108S flagship is the strongest single-battery self-propelled option for a half acre, the MO80L410 is the value path into 80V power for flat quarter-acre yards, and the LMB401 is the lighter push alternative. The trade-offs are the smaller 80V ecosystem and the flagship’s 89.1 lb weight. If you’re building a multi-tool battery yard, check the 80V tool lineup before committing — if you just want the most grass cut per charge, this is the family.

Greenworks 80V FAQ

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