If you have already looked at the Scout 425 LXF, the obvious question about the 435 LXF Li-Ion is why it exists at all. Fourteen inches of extra length does not justify a second model. The answer is not in the hull. It is in what Scout took out of the systems room.
The same boat, minus the genset
Put the two spec sheets side by side and the family resemblance is almost total. Both carry a 13-foot-1 beam. Both run 22 degrees of transom deadrise on Scout's dual stepped bottom. Both are built in Carbon Epoxy Construction - carbon fiber and E-glass as the primary reinforcements in an epoxy infusion. Both draw approximately 28 inches and both are rated to 1,800 horsepower. The 425 is 42 feet 2 inches and 17,064 pounds dry; the 435 is 43 feet 4 inches and 17,450 pounds dry.
Two things actually change. The 425 carries an 8 kW diesel generator on its own 26-gallon diesel tank. The 435 carries no generator at all. And fuel goes from 545 gallons to 605.
What Scout actually publishes about the lithium system
It is worth being precise here, because this is the kind of feature that attracts more description than it deserves.
Scout's standard equipment list for the 435 LXF Li-Ion specifies a Fathom 48V e-Power lithium-ion battery system. Scout's own model page describes it as a Fathom e-Power lithium-ion battery management system with no generator necessary, and adds that the batteries are charged by the Mercury engines as well. The flyer lists one or two 40-amp chargers as standard depending on whether the boat is rigged with triple or quad engines, alongside a 50-amp Glendinning shore power cord reel. Digital switching is EmpirBus rather than the C-Zone system Scout uses on the 425.
That is the published extent of it. Scout does not publish a bank capacity in kilowatt-hours, an amp-hour rating, or a run-time for the 12,000 BTU air conditioner at anchor. If those numbers decide your purchase - and for a boat sold on exactly this feature they reasonably might - get them confirmed against the build sheet rather than inferred from anything you read, here or anywhere else.
What Scout does commit to in writing is the outcome: a 12,000 BTU air conditioner as standard cabin equipment on a boat with no genset and no diesel day tank aboard.
Triple Mercury 600s, and only triple Mercury 600s
Scout publishes one tested performance bulletin for this hull, run with the Seakeeper aboard on triple Mercury 600 V12 Verados with Verado 12 stainless props in 35p/33p/35p. The test is dated August 2026, which makes it one of the freshest sheets in the LXF range - several bulletins on neighbouring models predate their current spec sheets by two years or more.
Top speed is 70.2 mph at 6,400 rpm. Zero to 30 mph takes 6.97 seconds. Scout marks best fuel efficiency at 0.73 mpg at 37.7 mph, and the same 0.73 mpg appears again at 4,000 rpm and 43.8 mph. That is a broad plateau rather than a knife-edge, which is genuinely useful: it means a cruise anywhere in a six-mile-per-hour band costs you nothing in economy.
Scout publishes an estimated range of 441 miles for this configuration and footnotes it as an estimate based on fuel consumption at optimal cruising speeds and sea conditions. We are quoting it as Scout labels it, and we have not computed a range of our own. The spec table's range figure for the optional fuel saddle tanks is listed as TBD, so there is no published number for that build.
One gap to note. Scout publishes rigged dry weights for twin Mercury 600s at approximately 21,250 pounds and quad Mercury 425s at approximately 21,510 pounds - but not for the triple 600 package it tests and sells. The rigged weight of the boat on the bulletin is not published anywhere.
The cabin, with numbers attached
The 435 publishes what the 425 does not. Cabin headroom is 6 feet 6 inches. Head standing room is 6 feet 3. Berth sleeping length is 7 feet 2.
The head area is enclosed with a full-size toilet and a hot and cold sink. The shower is separately enclosed behind its own door. The galley carries a sink, a single-burner glass cooktop, a microwave and a drawer refrigerator. There is a 32-inch LED smart TV with speakers, port and starboard windows with privacy shades, a sitting area with a convertible berth, stainless accents and LED accent lighting. Waste goes to a 17-gallon holding tank with overboard discharge, and fresh water is 66 gallons with a standard water heater.
For a walkaround center console, that is a lot of boat below the deck line - and unlike most of its class, you can check the dimensions against your own height before you place an order.
Deck and fishing
Fifteen stainless flush-mount gunnel rod holders is five more than the 425 carries. There are eight pull-up flush-mount cleats, port and starboard floor fish boxes with overboard diaphragm discharge, a fully walkable transom swim platform with a removable ladder, and an electrically actuated transom stern seat.
Hydraulic beach platforms are fitted on both sides as standard, where the 425 gets one on the port side. The leaning post carries an aft-facing seat with an under-seat cooler, a hidden grill drawer, a tackle storage and trash unit, and retractable fresh and raw water hoses. An electronic bow table with cushion filler, integrated bow backrests, a Lewmar windlass with helm and bow foot switch operation, a bow anchor camera and Zipwake dynamic trim interceptors are all standard.
Where the paperwork disagrees with itself
Three things to confirm on the build sheet, because Scout's own documents are not consistent on them.
Fuel capacity: the model flyer's equipment list says a 615-gallon gas tank. The specification table, the performance bulletin and the model page all say 605 gallons. We have used 605.
Fish boxes: the specification table lists 120-gallon aft fish boxes port and starboard. The flyer's deck list says 92 gallons each, which is the 425 LXF's figure. We have used the specification table.
The Seakeeper: the model page's feature description says a Seakeeper 5 is standard, while the flyer's equipment list says a Seakeeper 4.5. Both agree that a Seakeeper is standard equipment; they disagree on which one.
None of these change what the boat is. All three are worth ten seconds of confirmation before a deposit.
Who this boat is for
The 435 LXF Li-Ion is for the buyer whose objection to a 43-foot center console is the generator - the tank, the service interval, the noise at anchor, the thing that ruins a good day when it will not start. Scout's answer is to remove it and run the boat's 120-volt load off a lithium bank instead, with the Mercury engines doing the charging.
It is not the only Scout that works this way. The 377 LXF and the 400 LXF Li-Ion take the same approach at smaller sizes. So the question is not whether you believe in the architecture; it is whether you want it at 43 feet, with 605 gallons underneath and a published 441-mile estimate on the sheet.
If you want a choice of engine packages, this is not the hull - there is one bulletin, and it is triple Mercury 600 V12s. If you want the conventional answer at almost exactly this size, the 425 LXF is 14 inches shorter, carries an 8 kW generator as standard, and gives you two tested packages to argue about instead of one.