Our take
The Oregon LM400 is a 20-inch cordless mower whose manual documents six height settings, a 60-liter grassbox, and rear bagging, mulching, and side discharge. The plain LM400 configuration is tool-only, so the battery and charger are separate purchases. Its manual pairs an approximate 3,500-square-foot claim with 350 square meters, which are not equivalent conversions; the area claim is left unresolved. The manual does not give a comparable maximum runtime or identify a self-propelled drive system. This review compares manufacturer documentation; it is not a cutting test.
A buyer who already owns a compatible Oregon 40 V B-series battery and charger and wants a 20-inch mower with bagging, mulching, and side discharge..
It is not a ready-to-mow kit for someone who needs a battery and charger in the box. Buyers who require documented self-propelled drive, a guaranteed area per charge, or a stated runtime should verify those needs before choosing it.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The manufacturer documents a 20-inch cutting width and six settings from approximately 1 to 3 inches.
- The manual identifies rear bagging, mulching, and side discharge, so the clipping method can change with the job.
- The mower accepts one or two Oregon 40 V B-series packs; one battery is sufficient to operate it.
What to weigh up
- The LM400 tool-only configuration includes neither a battery nor a charger.
- The manual’s area estimate has conflicting imperial and metric figures, and it does not state a runtime in minutes.
- The exact-model manual does not state a self-propelled drive configuration or a maximum self-propel speed.
Specifications and exact model details
The key details
| Model covered | LM400 |
|---|---|
| Cutting width | 20 in cutting width; six settings from approximately 1 to 3 in |
| Drive and battery platform | Oregon 40 V B-series battery platform; operates with one or two batteries |
| Battery and charger configuration | Tool-only LM400 configuration; battery and charger are not included |
| Cutting and collection | Rear bagging, mulching, and side discharge are documented |
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 20-inch deck with six height settings
Oregon lists a 20-inch blade width and six central height positions, approximately 1, 1⅜, 1¾, 2⅛, 2½, and 3 inches. That gives the LM400 a middle-width role between narrow compact mowers and broader 21-inch models. The manual advises starting with a higher setting and testing a small area before lowering the cut. The settings help compare documented adjustment range; they do not establish the right height for a specific grass type or guarantee a finish on uneven ground.
Bring an Oregon battery and charger
The maker identifies the LM400 as using Oregon 40 V B-series batteries and says the mower can hold two packs but needs only one to run. Oregon lists a separate LM400 tool-only configuration without a battery or charger; kit variants use different model suffixes. The manual’s area statement pairs approximately 3,500 square feet with 350 square meters, figures that do not convert to the same area. Because the manufacturer’s units conflict, the comparison leaves the area field unknown instead of choosing one number. No runtime in minutes is stated.
Choose between bagging, mulch, and side discharge
The LM400 manual names a rear debris bag, a mulching plug, and a side-discharge chute. Its grassbox is 60 liters, or 15.9 gallons; the comparison profile converts that volume to dry bushels so it can be compared with products whose makers publish that unit. This is a relatively substantial documented collection volume, though bag capacity alone does not say how often an operator will empty it. The three clipping modes are useful configuration options, not evidence of superior cut quality, which has not been independently tested here.
A folding handle helps define storage
Oregon’s manual shows the handle moving forward and the mower resting upright on its rear frame for storage. That provides a documented way to reduce the floor area it occupies when the mower is not in use. Oregon lists a weight of 58.8 pounds with one battery, so a buyer should consider lifting and storing the machine as well as its footprint. The tool-only listing does not include that battery, and the manual does not describe a powered drive system that would move the mower forward for the operator.
Keep the area estimate and drive details in perspective
The manual’s area estimate is tied to a 4.0 Ah battery, but it pairs approximately 3,500 square feet with 350 square meters; those values conflict under unit conversion. The comparison therefore does not use either figure to screen or promise coverage. Oregon does not state a maximum runtime in minutes. The instructions identify a safety button and switch lever but do not specify self-propelled drive or a speed range, so those profile fields remain unknown rather than being inferred from the mower’s battery power. Confirm the exact LM400 tool-only code, compatible battery, and charger contents on the seller page before buying.
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Before you buy
Does the LM400 include a battery and charger?
The manufacturer lists LM400 as a tool-only configuration. Other LM400 kit variants use different model suffixes, so check the exact seller model and package contents.
Can the mower use two batteries?
Yes. Oregon says it can hold two Oregon 40 V B-series packs, but it only requires one to operate. Its manual pairs approximate area figures of 3,500 square feet and 350 square meters, so the comparison leaves that claim unresolved.
Which clipping modes are documented?
The LM400 manual describes rear bagging, a mulching plug, and a side-discharge chute. It does not provide a comparative cut-quality test for those modes.
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.
- Oregon LM400 lawn mower instruction manual ↗ — checked October 16, 2026.
- Oregon LM400 lawn mower instruction manual ↗ — checked October 16, 2026.
- Oregon 40 V lawn mower configurations, including LM400 tool-only ↗ — checked October 16, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.