Fullriver DC20-12 · Marine battery 20Ah 135A AGM

Marine battery Fullriver DC20-12 DC 20Ah 135A 12V

With 20 Ah at 12 V and 135 A of cold cranking current (EN), the Fullriver DC20-12 from the DC range is built for motor and sailing boats, both for engine starting and onboard services. It replaces the original battery without adaptation in boats with a 181 × 77 × 167 mm format: same 20 Ah capacity.

• Powers onboard services: lights, sounder, GPS, fridge.
• Tolerates the daily cycling of a boat in season.
• AGM technology: absorbed electrolyte, no spills, can be mounted at an angle.
• Reinforced case against vibration and swell.

What the Fullriver DC20-12 is for

With 20 Ah, the Fullriver DC20-12 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 6.44 kg and M5 terminals.

Dimensions, polarity and mounting

In terms of format, the Fullriver DC20-12 measures 181 × 77 × 167 mm (length × width × height) and weighs 6.44 kg. It uses M5 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.

The Fullriver DC20-12: DC range and AGM technology

Within the Fullriver catalogue, the DC series groups the references designed for this use. The DC20-12 is the 20 Ah model of that family, with the same performance as its siblings in other sizes.

AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery.

What Fullriver does differently

Fullriver specialises in deep-cycle AGM batteries for mobility, marine, solar and traction. Its DC and HC series are known for their tolerance to deep discharge and long cycle life. We guarantee that every Fullriver arrives new, charged and with the manufacturer's full warranty.

Warranty and coverage

The Fullriver DC20-12 comes with the manufacturer's official warranty against manufacturing defects. Deep discharge from winter lay-up without charging is not covered.

Usage and maintenance tips

Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up.

Delivery times and returns

Same-day dispatch from our warehouse for in-stock orders placed before 6:00 pm: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for 14 days if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email.