Fulmen FF1251 · Truck battery 12V 125Ah 850A
Specifications
| Brand | Fulmen |
|---|---|
| Part number | FF1251 |
| Voltage (V) | 12 |
| Capacity (C20) | 125Ah (c20) |
| Technology | Lead-acid |
| Length | 349 mm |
| Width | 175 mm |
| Height | 285 mm |
| Weight | 31 Kgs |
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Fulmen FF1251 12V 125Ah 850A 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
850 A
Dimensions
349×175×285 mm
Technology
Lead-acid
Polarity
Positive on the left
Weight
31 kg
Model
FULMEN Power Pro (HDX)
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Truck battery Fulmen FF1251 PowerPRO 125Ah 850A 12V
12VVoltage
125AhCapacity
850ACold cranking
31kgWeight
The Fulmen FF1251 truck battery is rated at 12 V, 125 Ah and 850 A of cold cranking current (EN) from the PowerPRO range, and is prepared for trucks, buses, tractors and heavy machinery. 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.
Size, terminals and hold-down of the Fulmen FF1251
In terms of format, the Fulmen FF1251 measures 349 × 175 × 285 mm (length × width × height) and weighs 31 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 and 1 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.
What the Fulmen FF1251 is for
With 125 Ah, the Fulmen FF1251 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 31 kg, 1 terminals and B00 hold-down.
The Fulmen FF1251: PowerPRO range and conventional lead-acid technology
Within the Fulmen catalogue, the PowerPRO series groups the references designed for this use. The FF1251 is the 125 Ah model of that family, with the same performance as its siblings in other sizes.
In a conventional battery the electrolyte is liquid and the lead plates are immersed in it. It is a mature, economical and easily recycled technology, ideal for starting vehicles in normal use.
Fulmen: the maker behind the FF1251
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. We guarantee that every Fulmen arrives new, charged and with the manufacturer's full warranty.
Manufacturer's warranty
The Fulmen FF1251 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
In 24 V installations, check periodically that both batteries show the same voltage; an imbalance means one is failing. 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 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.
BCOM-FULMEN-FF1251
Data sheet
- Brand
- FULMEN
- Reference
- FF1251
- Model
- FULMEN PowerPRO
- Voltage (V)
- 12
- Length
- 349 mm
- Width
- 175 mm
- Height
- 285 mm
- Weight
- 31 Kgs
- Technology
- Lead-acid
- EAN
- 3661024047456
- Terminal layout
- Positive terminal on the left
- Terminal type
- 1
- Hold-down
- B00
- Cold cranking amps (EN)
- 850A
- Capacity (C20)
- 125Ah (c20)
- Case type
- D03
Specific References
- EAN13
- 3661024047456
- MPN
- FF1251
Codes and references Fulmen FF1251
| Brand | Fulmen |
|---|---|
| Manufacturer range | FULMEN PowerPRO |
| Manufacturer reference (MPN) | FF1251 |
| EAN-13 barcode | 3661024047456 |
| Dimensions (length × width × height) | 349 × 175 × 285 mm (349x175x285) |
Comparison: Fulmen FF1251 vs equivalents
The Fulmen FF1251 is interchangeable with these equivalent references: J2 (Varta), EF1251 (Exide), EG1251 (Exide), TF1251 (Tudor), TG1251 (Tudor).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Fulmen
FF1251
This battery
|
12V 125Ah 850A | Lead-acid | |
Varta
J2
|
12V 125Ah 720A | Lead-acid | €139.70 |
Exide
EF1251
|
12V 125Ah 850A | Lead-acid | €123.20 |
Exide
EG1251
|
12V 125Ah 760A | Lead-acid | €136.20 |
Tudor
TF1251
|
12V 125Ah 850A | Lead-acid | €122.10 |
Tudor
TG1251
|
12V 125Ah 760A | 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 do I fit the FF1251 model in my truck?
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.
What is the service life of the FF1251 model?
Expected lifespan of the Fulmen FF1251 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 measurements of the FF1251 model?
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 FF1251 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 FF1251 typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which batteries are equivalent to the Fulmen FF1251?
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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