Fulmen FG1203 · Truck battery 12V 120Ah 680A

Truck battery Fulmen FG1203 StartPRO 120Ah 680A 12V

The Fulmen FG1203 with conventional lead-acid technology delivers 120 Ah at 12 V and 680 A of cold cranking current (EN): what trucks, buses, tractors and heavy machinery demand. It replaces the original battery without adaptation in trucks with a 513 × 189 × 223 mm format: same 120 Ah capacity and the positive terminal on the left.

• Powerful cold cranking for large-displacement diesel engines.
• Designed for 24 V installations with two batteries in series.
• Conventional lead-acid: the most proven and economical technology.
• Heavy Duty construction for intensive professional use.

Will it fit your current battery tray?

The Fulmen FG1203 is made in the 513 × 189 × 223 mm format and weighs 32.50 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. 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.

What the Fulmen FG1203 is for

The Fulmen FG1203 is designed for trucks, buses, tractors and heavy machinery. In 24 V installations with two batteries in series, replace both at the same time to avoid imbalance. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 32.50 kg and B00 hold-down.

The Fulmen FG1203: StartPRO range and conventional lead-acid technology

Within the Fulmen catalogue, the StartPRO series groups the references designed for this use. The FG1203 is the 120 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 FG1203 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.

Care and maintenance

Keep the terminals clean and tight and the battery firmly secured against chassis vibration. During rest stops with active loads, avoid repeated deep discharges: they shorten the life of any starter battery.

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.