Compact walk-behind comparison
Greenworks LM1404 or LM1624? Compare 14- and 16-inch 40V push mowers
The Greenworks LM1404 and LM1624 are easy to group because each is a 40V, push-only walk-behind kit with one 4.0Ah battery, a charger, a rear catcher and a 2-in-1 mulch/bag description. They are not identical products: LM1404 is the 14-inch SKU 2508202 with internal code MO40B410; LM1624 is the 16-inch SKU 2540802 with internal code LMF417. The two-inch difference is a cutting-path choice, not a statement about each mower's full width, folded size or weight.
Start with the route and the mowing plan
Measure the tightest gate, turn and storage opening before deciding that a small deck will fit. Neither listing supplies a dependable full assembled-width figure in the material used here. A 14-inch path can take more passes across an open rectangle than a 16-inch path, while it may be easier to work around separated lawn strips. These are geometry tradeoffs, not a claimed productivity test. If operator-pushed travel is not acceptable, both models are the wrong drive configuration; neither supplies self-propelled assistance.
Both product pages support mulching and rear bagging. They do not document side discharge, so do not cross-match a chute from a larger Greenworks mower. LM1624's matching manual identifies the grass catcher and mulch plug and explains how to switch between them. LM1404's page FAQ describes plug use, but the operator PDF linked from its exact page has a different cover identity and should not be treated as a confirmed MO40B410 manual. For either model, distinguish an operating mode from a promise that every removable insert appears in the carton.
Battery kits share a voltage line, not every fit detail
Each reviewed package includes one 40V 4.0Ah battery and a charger. Greenworks claims up to 45 minutes with that included pack and a 120-minute recharge for both. Treat those as maximum manufacturer figures; grass height, clipping route, slope and turning load can reduce what is completed in one session. The 14-inch page claims up to one-third acre. LM1624's page conflicts with itself: one specification block states one-quarter acre, while its feature section and extended summary say up to one-third. The area comparison is therefore not a clean basis for choosing between them.
LM1404 has one especially useful kit caveat: Greenworks says its 40V 8Ah battery will not let the cover close. A platform label alone is not a substitute for checking the actual pack, connector and compartment. The LM1624 page advertises use within the Greenworks 40V system but does not settle every battery-size fit question. If an existing pack is the reason to buy either mower, check the exact battery compatibility information before relying on it.
Two unresolved measurement details
LM1624's matching LMF417 manual gives five positions over 1¼–3⅜ inches. The product page also lists five, and gives that same range. It lists “product weight” at 40.7 pounds, while the manual gives 29 pounds without the battery; those are different weight bases. Neither number alone is the assembled, ready-to-mow mass of the kit. LM1404's page also lists five positions, but its feature section says 1¼–3⅜ inches while its specification table says 1.2–3.1 inches. Its 43-pound product weight has no stated basis.
There is also a documentation distinction that matters more on the 14-inch model. LM1624's linked manual cover shows SKU 2540802 and LMF417. LM1404's linked manual instead shows SKU 2506302, MO40B00 and LMF334, while the kit page names SKU 2508202 and MO40B410. That mismatch leaves the exact blade-service and part instructions unbridged. Ask Greenworks for a manual tied to the label on an LM1404 before model-specific maintenance; do not assume the nearly identical deck size makes service procedures interchangeable.
Which one belongs on the shortlist?
LM1404 makes sense when the narrowest stated cutting path is a real advantage, a 40V kit is wanted and its manual/height documentation can be clarified for the delivered unit. LM1624 makes sense when a 16-inch path is still compact enough and the matching manual, 5-position range and exact manual-listed weight without battery are valuable; its area and total-weight differences still need careful interpretation. If your questions are less demanding than those conflicts—push versus self-propel, bag versus mulch, single 4Ah kit versus two—either can remain on a shortlist.
For regular mowing, wait for dry grass, clear objects, avoid unsafe slopes and remove the battery before clearing or maintaining the mower. The LM1624 manual and Greenworks' page advice limit operation on slopes above 15 degrees and recommend mowing across rather than up and down. Use the manual that actually matches the mower in your possession. Read the LM1404 review and LM1624 review for their configuration-specific evidence, then confirm the exact model code, battery and included parts with the seller.