Fulmen FG1251 StartPRO · Truck battery 125Ah 760A

Truck battery Fulmen FG1251 StartPRO 125Ah 760A 12V

The Fulmen FG1251 with conventional lead-acid technology delivers 125 Ah at 12 V and 760 A of cold cranking current (EN): what trucks, buses, tractors and heavy machinery demand. Its 349 × 175 × 285 mm and the positive terminal on the left make it the exact replacement for the 125 Ah battery fitted as standard to many trucks.

In short: the Fulmen FG1251 (125 Ah, 760 A, 349 × 175 × 285 mm, positive terminal on the left). Verified equivalent alternatives: Varta J2 and Exide EF1251.

• Better tolerance to deep discharge than a conventional starter battery.
• Powers tachograph, fridge and heater during rest stops.
• Resistant to constant chassis vibration.
• Good balance of capacity, cranking power and price.

Dimensions, polarity and mounting

In terms of format, the Fulmen FG1251 measures 349 × 175 × 285 mm (length × width × height) 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.

What the Fulmen FG1251 is for

With 125 Ah, the Fulmen FG1251 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.

The Fulmen FG1251: StartPRO range and conventional lead-acid technology

Within the Fulmen catalogue, the StartPRO series groups the references designed for this use. The FG1251 is the 125 Ah model of that family, with the same performance as its siblings in other sizes.

Conventional lead-acid is the benchmark against which other technologies are compared: good cranking current, great tolerance to alternator charging and the best price per amp-hour.

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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty.

Manufacturer's warranty

The Fulmen FG1251 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.

Usage and maintenance tips

Keep the terminals clean and tight and the battery firmly secured against chassis vibration. On batteries with filler caps, check the electrolyte level and top up only with distilled water.

Shipping, delivery and returns

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 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.