Our take
Greenworks documents the LMF403 as a 40 V, 21-inch self-propelled mower kit with one 5.0 Ah USB battery and a charger. The manufacturer lists three clipping choices and up to 45 minutes of runtime with the included battery, plus a stated 150-minute charge time. The page also describes folding handles. It does not give a self-propel speed, bag capacity, or cutting-height range for this exact product page, so those facts remain unknown here. This is a documentation-based assessment; no runtime or cut test is claimed.
A buyer who wants a wider self-propelled cordless mower and prefers to receive its battery and charger in the documented kit..
It is not a proven match if you need a documented drive-speed range, a particular bag capacity, or a maker-stated height setting that the cited page does not provide.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The manufacturer identifies the exact LMF403 as a 21-inch self-propelled model.
- The named kit includes a 40 V 5.0 Ah USB battery and charger.
- Mulching, bagging, and side discharge are all listed for the mower.
What to weigh up
- The up-to-45-minute runtime is a manufacturer claim, not a guarantee for every lawn.
- The cited exact-model page does not state the mower's drive-speed range or bag capacity.
- The listed 150-minute recharge time can matter when the included battery is depleted.
Specifications and exact model details
The key details
| Model covered | LMF403 |
|---|---|
| Cutting width | 21 in deck |
| Drive and battery platform | Self-propelled; maximum speed not specified on the cited page |
| Battery and charger configuration | 40 V platform; 5.0 Ah battery and charger included |
| Cutting and collection | Mulch, bag, or side discharge; bag capacity not stated |
Performance figures are manufacturer claims. Source checked October 16, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
A 21-inch deck paired with powered drive
The Greenworks page identifies a 21-inch cutting deck and self-propelled operation. That pairing may appeal to buyers comparing a wider pass and powered forward movement, particularly when a push-only mower is not the preferred format. The source does not state the LMF403's maximum self-propel speed, so a buyer who needs a particular walking pace cannot use the listing to verify that threshold. Width and drive describe configuration, not proven cutting speed.
A named 40 V battery and charger kit
The exact product page labels the machine as a 40 V mower kit and lists one 5.0 Ah USB battery with a charger. That evidence is useful for shoppers who do not already own a compatible pack and want the base configuration documented before buying. The Greenworks 40 V platform is distinct from its 80 V products and from other manufacturers' voltage systems. Check that a current seller page still names LMF403 and includes the same kit.
Runtime and charging remain maker claims
Greenworks states up to 45 minutes with the included battery and a 150-minute recharge time. Those figures describe a manufacturer-stated configuration; grass height, conditions, and operator use can change the time available. The runtime claim is below a 60-minute hard threshold in the questionnaire, and the sources do not provide a second-battery package for this row. Buyers should plan around their own work pattern rather than treating the area claim as a guarantee.
Three documented ways to handle clippings
The LMF403 product page lists mulching, bagging, and side discharge. A buyer who wants side discharge can rely on a model-level maker claim for that mode, while someone who bags should still verify the exact grass-bag package and capacity because the cited page gives no bushel figure. No mode is ranked as producing a better finish. The practical choice depends on the buyer's preferred clipping routine and the exact accessories supplied by the seller.
Folding handles help storage, within limits
Greenworks describes folding handles on the LMF403 page, which gives buyers a documented storage feature to compare. The page says the handles take up less space but the reviewed source does not establish a folded dimension or vertical-storage position for this model. A buyer with a narrow shed should measure the available opening and confirm the seller supplies the exact LMF403 configuration. The manufacturer also lists a 150-minute battery recharge time, which affects when the next session can begin.
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Before you buy
Is the LMF403 self-propelled?
Yes. Greenworks identifies the exact LMF403 as a self-propelled mower. The cited product page does not state a maximum drive speed.
What comes in the documented kit?
The Greenworks page lists one 40 V 5.0 Ah USB battery and a charger. Check that the seller's exact offer still includes both.
Does it support side discharge?
Yes. Greenworks lists a 3-in-1 system with mulching, bagging, and side discharge. The page does not state bag capacity.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources and review basis
Sources & review basis
We use the linked product documentation for the features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Greenworks LMF403 product specifications ↗ — checked October 16, 2026.
- Greenworks LMF403 product specifications ↗ — checked October 16, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.