Greenworks LM2138S 21-inch 80V self-propelled mower kit, SKU 2515902 review

The exact kit and its best-fit use

Greenworks identifies LM2138S as SKU 2515902 and model MO80L00 on its U.S. product page. This is a 21-inch, 80V brushless walk-behind mower with rear-wheel self-propel drive, one included 4.0Ah battery and a rapid charger. Greenworks lists a grass bag and side-discharge attachment in the package. Its page describes a mulching mode, but the checklist does not name a mulch plug; the page-linked manual shows one under different internal cover codes, so confirm the exact box contents if the plug must be included. The manufacturer claims up to 45 minutes of runtime and up to one-third acre with the included battery. Those are ceilings, not a mowing guarantee: grass condition, cutting height, drive speed and the bagging load all change the amount finished per charge.

The cutting path is one inch narrower than the 22-inch LM2208S. That does not automatically make the whole machine one inch narrower, but the LM2138S page does publish assembled dimensions of 61.42 by 22.05 by 37.8 inches. The listed width is useful when planning a route through a shed or gate; still measure the actual folded or assembled machine and the clearance you have. Its 60-liter catcher is a documented bag size, not a promise about how often you will need to empty it.

Three clipping routes, one battery package

The exact listing describes three modes: mulch, rear bag and side discharge. This is a simpler set of documented clipping routes than the 22-inch LM2208S marketing page, which says four-in-one but uses Turbo as a temporary blade-speed boost in its manual. The LM2138S is not documented as having that Turbo boost or the dual-blade system. For bagging, the exact package list identifies a catcher; for mulching, do not assume a plug ships with MO80L00 just because a different-code manual depicts one. The side-discharge attachment is listed for this SKU. That is one documented clipping route, not proof of a separate fourth leaf-pickup function.

One 4Ah pack is supplied, not two smaller packs. Greenworks says this mower operates with a single battery; its linked manual describes a battery storage compartment, so a storage cavity should not be counted as a second powered port. The manufacturer page states that its 80V battery platform spans other Greenworks 80V tools, but not its separate voltage families. The exact charger is called “rapid” and the page claims a 60-minute recharge; it does not provide a charger wattage or model in the package specification. If a second pack, two active ports or a known charger rating is mandatory, this kit has not been shown to meet that need.

The manufacturer lists a four-year limited tool and battery warranty, seven single-lever cut-height positions and a 1⅜-to-3¾-inch range. The listed deck is steel and the motor is brushless. It does not specify an included high-lift bagging lower blade, so do not select the mower for that exact blade requirement unless the delivered kit or current part list confirms it. A self-propelled mower can be harder to carry than a push-only one; ask whether the powered drive helps enough to offset the kit’s uncertain transport weight for your own stairs or vehicle.

A source-code mismatch worth resolving before service

The exact product page labels the kit MO80L00, while the “Owner’s Manual” link on that page opens a manual whose cover identifies LMB408 and MO80L410. The page still supplies concrete LM2138S package and feature details, and its FAQ states the maker’s slope advice, but the different codes are not interchangeable proof of every internal part or repair step. Before ordering blades, seeking service or relying on a code-specific maintenance instruction, compare the label on the mower and the manual supplied with that unit. The online manual’s technical table also lists a weight of 62.8 pounds without a battery, while the exact product page lists 71.65 pounds without stating a weight basis. I leave lifting weight unresolved rather than choosing whichever number looks convenient.

The exact page FAQ advises walk-behind mower operators not to use slopes greater than 15 degrees and to mow across rather than up and down. The linked manual also states a 15-degree limit and advises low self-propel speed, but its cover codes do not match MO80L00; rely on the exact page FAQ and the physical unit’s own manual for the limit that applies to your mower. Both the linked manual and Greenworks’ exact-page guidance say not to mow wet grass. Battery power and a brushless motor do not make slick turf a safe use case.

Choosing LM2138S over LM2208S

Shortlist LM2138S when a 21-inch cutting path, self-propelled travel and one included 4Ah 80V pack fit the yard better than a wider dual-blade package. Its exact page identifies mulch, bag and side discharge as modes; the bag and discharge attachment are listed in the kit, but the mulch-plug inclusion is not established for MO80L00. Compare it with LM2208S if you value that model’s 22-inch deck and two included 4Ah packs; confirm its exact weight and height-position count because its page and manual disagree too. Neither maker’s acreage claim predicts a particular property. A small but steep, dense lawn can be harder work than a larger, flat lawn with regular cuts.

Use the product-level maximum as a rough manufacturer comparison only, then account for battery ecosystem, storage, slopes, clipping route and the exact kit code. A push-only mower may be preferable when simplicity and hand-propelled movement matter more than a rear-drive system. LM2138S is not that push-only model: the suffix matters. Before purchase, make sure the seller’s carton says LM2138S / SKU 2515902 rather than a nearby 80V Greenworks mower or another kit, and keep the correct manual with the machine.

Manufacturer sources: Greenworks LM2138S / SKU 2515902 page, its linked operator manual, and the Greenworks recall register checked for the exact model and SKU.