Fulmen FG1251 · Truck battery 12V 125Ah 760A
Specifications
| Brand | Fulmen |
|---|---|
| Part number | FG1251 |
| Voltage (V) | 12 |
| Capacity (C20) | 125Ah (c20) |
| Cold cranking amps (EN) | 760A |
| Technology | Lead-acid |
| Length | 349 mm |
| Width | 175 mm |
| Height | 285 mm |
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Fulmen FG1251 12V 125Ah 760A is an SHD (Super Heavy Duty) truck battery for intensive professional use. Vibration-resistant, withstands long cold-diesel cranks and deep discharges during parking with active loads (tachograph, refrigeration, heater).
Why this truck battery?
- True Heavy Dutybuilt for intensive professional use
- Long cold-diesel cranksreliable even in extreme cold
- Powers services at idletachograph, heater and lights with engine off
Voltage
12 V
Capacity
125 Ah
Cold cranking
760 A
Dimensions
349×175×285 mm
Technology
Lead-acid
Polarity
Positive on the left
Weight
29,5 kg
Model
FULMEN StartPRO
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Truck battery Fulmen FG1251 StartPRO 125Ah 760A 12V
12VVoltage
125AhCapacity
760ACold cranking
29.50kgWeight
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.
- 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.
BCOM-FULMEN-FG1251
Data sheet
- Brand
- FULMEN
- Reference
- FG1251
- Model
- FULMEN StartPRO
- Voltage (V)
- 12
- Length
- 349 mm
- Width
- 175 mm
- Height
- 285 mm
- Weight
- 29.50 Kgs
- Technology
- Lead-acid
- EAN
- 3661024045414
- Terminal layout
- Positive terminal on the left
- Hold-down
- B00
- Cold cranking amps (EN)
- 760A
- Capacity (C20)
- 125Ah (c20)
- Case type
- D03
Specific References
- EAN13
- 3661024045414
- MPN
- FG1251
Codes and references Fulmen FG1251
| Brand | Fulmen |
|---|---|
| Manufacturer range | FULMEN StartPRO |
| Manufacturer part number (MPN) | FG1251 |
| EAN-13 barcode | 3661024045414 |
| Dimensions (length × width × height) | 349 × 175 × 285 mm (349x175x285) |
Comparison: Fulmen FG1251 vs equivalents
The Fulmen FG1251 is interchangeable with these equivalent references: J2 (Varta), EF1251 (Exide), EG1251 (Exide), TF1251 (Tudor), TG1251 (Tudor).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Fulmen
FG1251
This battery
|
12V 125Ah 760A | Lead-acid | |
Varta
J2
|
12V 125Ah 720A | Lead-acid | €139.70 |
Exide
EF1251
|
12V 125Ah 720A | Lead-acid | €123.20 |
Exide
EG1251
|
12V 125Ah 720A | Lead-acid | €136.20 |
Tudor
TF1251
|
12V 125Ah 720A | Lead-acid | €122.10 |
Tudor
TG1251
|
12V 125Ah 720A | Lead-acid | €136.20 |
Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.
Recommended accessories
How to change the battery
Guide to replace a truck battery in 30-60 minutes. Truck batteries weigh 25-50 kg — we recommend working in pairs and using a carrying strap.
Step 1. Prepare the vehicle
Park on a flat surface, switch off the engine and remove the key. Make sure all lights and electrical accessories are off. Wait 1-2 minutes before starting.
Step 2. Locate the battery
Open the bonnet. The battery is usually in the engine bay, but in many modern cars it may be in the boot or under the passenger seat. Check the manual if you cannot find it.
Step 3. Disconnect the negative (−) terminal
Use the 10 mm wrench to loosen the negative cable nut (black, marked −) and remove the cable from the post. Move it aside so it cannot touch any bodywork.
Step 4. Disconnect the positive (+) terminal
Repeat with the positive cable (red, marked +). Important: never let a terminal touch metal of the car while the other is still connected.
Step 5. Remove the old battery (two people)
Loosen the bottom hold-down clamp. Truck batteries weigh 25-50 kg — lift in pairs with gloves and a carrying strap. Forcing the lift alone risks back injury.
Step 6. Install the new battery
Place the battery in the same orientation as the old one (positive terminal on the same side). Tighten the hold-down clamp firmly.
Step 7. Connect the cables
Connect the positive (+) terminal first, then the negative (−). Tighten the nuts with the wrench until each terminal does not move. Apply anti-spark grease if you have any.
Step 8. Verify the engine starts
Close the bonnet. Start the engine to confirm everything works. On cars with Start-Stop or a BMS, you may need to register the battery via OBD so the alternator applies the correct charging profile.
Frequently asked questions
How is the Fulmen FG1251 battery installed in the vehicle?
In most trucks it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On trucks with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
How long does the Fulmen FG1251 battery last?
Expected lifespan of the Fulmen FG1251 is 4 to 6 years in regular truck use without Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.
What are the dimensions of the Fulmen FG1251 battery?
Dimensions (length × width × height) are 349×175×285 mm — also written as 349x175x285 mm — following the European DIN standard. Always measure the space in your truck before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.
Is the FG1251 valid for my vehicle?
Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The FG1251 typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which batteries are equivalent to the Fulmen FG1251?
Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop trucks. See the "Equivalents" section to view recommended options at the same performance level.
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