Battery and exact configuration
Greenworks LM2108S or LM2112S? Compare the exact battery kits
Greenworks LM2108S and LM2112S are both self-propelled 21-inch battery mowers, but the nameplate voltage does not describe the full difference. LM2108S SKU 2550402 is an 80V kit with one 4.0Ah pack; LM2112S SKU 2532502 creates its listed 48V system with two 24V 5.0Ah packs. If you already own Greenworks batteries, begin by identifying the actual voltage family and compatible pack models. The manufacturer's product support states that battery lines are separate rather than cross-compatible.
Compare the exact boxes, not just mower names
The publicly reused LM2108S name appears with different Greenworks kits. The reviewed 2550402 configuration has one 4.0Ah battery and a charger, with published maxima of 33 minutes and one-half acre and a 40-minute recharge claim. A different LM2108S package, SKU LM2108SA1, lists both a 4Ah and 2Ah pack with a 2A charger; the 8Ah configuration is another package. Check the whole retailer SKU and included-battery list so you do not budget using the wrong pack. LM2112S, SKU 2532502, is clearly described as two 24V 5.0Ah USB batteries plus a dual-port charger. Greenworks says it needs two batteries to run; its maxima are 60 minutes and one-half acre, and its recharge estimate is 75 minutes per battery.
What changes in mowing?
Both are steel-deck, 21-inch, self-propelled models with seven height settings and a manufacturer's one-half-acre ceiling for the exact kit described here. Those similarities do not make a one-charge result interchangeable. The 80V mower's 4Ah pack and 33-minute claim differ from the 48V mower's two-pack 5Ah set and 60-minute claim. The LM2112S requires two 24V 5Ah packs together for its stated 48V system; the labels are per-pack ratings, not a single 48V 10Ah capacity or a runtime estimate. Dense or wet grass, a low cut, longer slopes, repeated turns, the collection bag and self-propel usage can reduce the work finished. Neither claim is a guarantee for the lawn in front of you.
Clipping claims also need careful reading. LM2112S's support-page introduction and its operator manual describe mulching, rear bagging and side discharge. Later page marketing text calls out a fourth leaf-pickup feature. Because the package description/manual do not establish a distinct leaf-pickup route, treat those three modes as verified and ask the seller or Greenworks for written details if leaf collection is essential. LM2108S is also marketed as 4-in-1, but its manual lists the same three clipping routes plus Turbo, and defines Turbo as a temporary rise in blade speed. That is an operating boost, not a separate bag, chute or vacuum attachment.
Choose around ownership limits
The LM2112S box is the better documented route if the need is specifically two 24V packs and a dual-port charger, or if those batteries match the user's existing Greenworks 24V tools. The LM2108S may suit an 80V tool owner who prefers a single supplied pack, with the caveat that one 4Ah kit does not equal the separate 4+2 or 8Ah packages sold under the same model name. Their listed warranties also differ: four years for the LM2108S SKU 2550402 tool and battery, versus three years for the LM2112S tool and battery. Read the written warranty for the exact purchase SKU and local seller; warranty duration alone does not show expected life or service access.
Both manuals caution about slopes and wet grass. Greenworks sets a 15-degree limit for walk-behind units and instructs the operator to cross slopes rather than mow directly up and down. Remove batteries before maintenance, keep people away from discharge paths, and measure the complete mower for gates and storage. If your decision requires exact transport weight, high-lift blade inclusion or a fourth clipping route, the product-page names alone do not settle it. Ask for the model/SKU-specific facts before buying rather than making an assumption from a similar Greenworks mower.
Exact package sources: LM2108S SKU 2550402, LM2108SA1 4Ah + 2Ah variant, and LM2112S SKU 2532502.