Fullriver FT438-U1 · Marine battery 35Ah 438A AGM

Marine battery Fullriver FT438-U1 Full Throttle Series 35Ah 438A 12V

The Fullriver FT438-U1 marine battery offers 12 V, 35 Ah and 438 A of cold cranking current (EN) from the Full Throttle Series range with AGM technology, designed for motor and sailing boats, both for engine starting and onboard services. Its 196 × 131 × 192 mm make it the exact replacement for the 35 Ah battery fitted as standard to many boats.

• Ready for starting outboard and inboard engines.
• AGM: faster recharging and better cycle resistance than a conventional battery.
• Resistant to humidity and salt air.
• Sealed: no spills or gases in the locker.

What the Fullriver FT438-U1 is for

With 35 Ah, the Fullriver FT438-U1 covers motor and sailing boats, both for engine starting and onboard services. At the end of the season, charge it fully before winter storage. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 11.30 kg and M6 + TP26 (SAE) terminals.

Will it fit your current battery tray?

In terms of format, the Fullriver FT438-U1 measures 196 × 131 × 192 mm (length × width × height) and weighs 11.30 kg. It uses M6 + TP26 (SAE) terminals, the system that anchors and connects it in the vehicle. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters.

Why choose Fullriver batteries

With its own plants and a catalogue focused on high-performance AGM, Fullriver is a familiar brand in power wheelchairs, boats and photovoltaic systems that need thousands of cycles. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty.

The Fullriver FT438-U1: Full Throttle Series range and AGM technology

Within the Fullriver catalogue, the Full Throttle Series series groups the references designed for this use. The FT438-U1 is the 35 Ah model of that family, with the same performance as its siblings in other sizes.

In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery.

How to make it last longer

As a service battery, avoid routine discharges below 50% to extend its cycle life. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections.

Warranty and coverage

The Fullriver FT438-U1 comes with the manufacturer's official warranty against manufacturing defects. Deep discharge from winter lay-up without charging is not covered.

Shipping, delivery and returns

Order before 6:00 pm with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have 14 days to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email.