Fulmen FD851T · Truck battery 12V 85Ah 350A GEL

Truck battery Fulmen FD851T Endurance+PRO Gel 85Ah 350A 12V

The Fulmen FD851T truck battery is rated at 12 V, 85 Ah and 350 A of cold cranking current (EN) from the Endurance+PRO Gel range, and is prepared for trucks, buses, tractors and heavy machinery. Measuring 349 × 175 × 235 mm and the positive terminal on the left, it is the direct replacement for trucks fitted from the factory with a 85 Ah battery of this format.

• GEL: excellent resistance to deep discharge and long cycle life.
• Resistant to constant chassis vibration.
• Powers tachograph, fridge and heater during rest stops.
• Better tolerance to deep discharge than a conventional starter battery.

What the Fulmen FD851T is for

With 85 Ah, the Fulmen FD851T cranks large-displacement diesel engines in the cold and powers tachograph, fridge and heater during rest stops. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 29.50 kg and B00 hold-down.

Dimensions, polarity and mounting

The Fulmen FD851T is made in the 349 × 175 × 235 mm format and weighs 29.50 kg. The positive terminal on the left decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses a B00 hold-down, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.

Why choose Fulmen batteries

With more than a century of history, Fulmen offers complete ranges for cars, trucks, motorcycles and leisure with the industrial quality of the Exide group. All the Fulmen batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.

The Fulmen FD851T: Endurance+PRO Gel range and GEL technology

The Endurance+PRO Gel is the Fulmen range the FD851T belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle.

A GEL battery is the choice when cycle resistance and safety matter most: no gases, no liquid and thousands of partial discharges in its lifetime.

How to make it last longer

In 24 V installations, check periodically that both batteries show the same voltage; an imbalance means one is failing. During rest stops with active loads, avoid repeated deep discharges: they shorten the life of any starter battery.

Warranty and coverage

The Fulmen FD851T comes with the manufacturer's official warranty against manufacturing defects. An important note for commercial vehicles: most trucks use two batteries connected in series (24 V installation). If you replace only one, the new battery works alongside the old one, which has already lost capacity; that imbalance shortens its life and the manufacturer may treat it as misuse. Always replace both at the same time.

When you get it and how to return it

Orders placed before 6:00 pm with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic and Canary Islands and the rest of the European Union allow 3 to 5 working days. You have 14 days to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships.