Deta DG1251 · Truck battery 12V 125Ah 760A
Specifications
| Brand | Deta |
|---|---|
| Part number | DG1251 |
| Voltage (V) | 12 |
| Capacity (C20) | 125Ah (c20) |
| Technology | Lead-acid |
| Length | 349 mm |
| Width | 175 mm |
| Height | 285 mm |
| Weight | 29.50 Kgs |
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Deta DG1251 12V 125Ah 760A is a professional battery for heavy commercial vehicles. Withstands constant chassis vibration, supports long cold-engine cranks and keeps auxiliary services running (tachograph, heater, refrigeration, GPS) during driver's mandatory rest stops.
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
DETA StartPRO
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Truck battery Deta DG1251 StartPRO 125Ah 760A 12V
12VVoltage
125AhCapacity
760ACold cranking
29.50kgWeight
The Deta DG1251 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. It replaces the original battery without adaptation in trucks with a 349 × 175 × 285 mm format: same 125 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 Deta DG1251 is made in the 349 × 175 × 285 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.
What the Deta DG1251 is for
With 125 Ah, the Deta DG1251 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 Deta DG1251: StartPRO range and conventional lead-acid technology
The DG1251 is part of the Deta StartPRO range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family.
The conventional lead-acid battery remains the most widespread technology thanks to its balance of capacity, cranking current and price. Well maintained and kept charged, it offers years of reliable service in vehicles without Start-Stop.
What Deta does differently
Deta is the German brand of the Exide group: batteries built with original-equipment technology and a very complete range for cars, Start-Stop, trucks, motorcycles and leisure. We guarantee that every Deta arrives new, charged and with the manufacturer's full warranty.
Manufacturer's warranty
The Deta DG1251 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.
How to make it last longer
During rest stops with active loads, avoid repeated deep discharges: they shorten the life of any starter battery. In 24 V installations, check periodically that both batteries show the same voltage; an imbalance means one is failing.
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-DETA-DG1251
Data sheet
- Brand
- DETA
- Reference
- DG1251
- Model
- DETA StartPRO
- Voltage (V)
- 12
- Length
- 349 mm
- Width
- 175 mm
- Height
- 285 mm
- Weight
- 29.50 Kgs
- Technology
- Lead-acid
- EAN
- 3661024025416
- 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
- 3661024025416
- MPN
- DG1251
Codes and references Deta DG1251
| Brand | Deta |
|---|---|
| Manufacturer range | DETA StartPRO |
| Manufacturer reference (MPN) | DG1251 |
| EAN-13 barcode | 3661024025416 |
| Dimensions (length × width × height) | 349 × 175 × 285 mm (349x175x285) |
Comparison: Deta DG1251 vs equivalents
The Deta DG1251 is interchangeable with these equivalent references: J2 (Varta), EF1251 (Exide), EG1251 (Exide), TF1251 (Tudor), TG1251 (Tudor).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Deta
DG1251
This battery
|
12V 125Ah 760A | 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 is the Deta DG1251 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 many years does this battery last?
Expected lifespan of the Deta DG1251 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 Deta DG1251 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.
Does this battery fit my truck?
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 DG1251 typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which batteries are equivalent to the Deta DG1251?
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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