# Truck battery Deta DF1251 12V 125Ah 850A ![Truck battery Deta DF1251 12V 125Ah 850A](https://baterias.com/3584-home_default/battery-deta-df1251-12v-125ah-850a.jpg) > Deta DF1251 truck battery 12V 125Ah 850A. Power Pro (HDX) range. Dimensions 349Γ—175Γ—285 mm, + terminal on the left. For heavy-duty fleets. **Category:** [Truck Batteries](https://baterias.com/gb/batteries-for-truck) β†’ [Deta](https://baterias.com/gb/deta) - **Canonical URL**: https://baterias.com/gb/battery-deta-df1251-12v-125ah-850a - **Language**: en-GB - **Brand**: Deta - **Reference**: BCOM-DETA-DF1251 - **EAN**: 3661024027175 - **MPN**: DF1251 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | DETA | | Reference | DF1251 | | Model | DETA PowerPRO | | Voltage (V) | 12 V | | Largo | 349 mm | | Ancho | 175 mm | | Alto | 285 mm | | Peso | 31 kg | | TecnologΓ­a | Lead-acid | | EAN | 3661024027175 | | Terminal layout | Positive terminal on the left | | Hold down | B00 | | Cold cranking amps (EN) | 850 A | | Capacity (C20) | 125 Ah (c20) | | Case type | D03 | ## Quick description **Deta DF1251 12V 125Ah 850A** 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 Duty** built for intensive professional use - **Long cold-diesel cranks** reliable even in extreme cold - **Powers services at idle** tachograph, heater and lights with engine off πŸ”Œ Voltage 12 V ⚑ Capacity 125 Ah C20 πŸ”‹ Cold cranking 850 A EN-1 πŸ“ Dimensions 349Γ—175Γ—285 mm βš™οΈ Technology Lead-acid 🧭 Polarity Positive on the left βš–οΈ Weight 31 kg 🏷️ Model DETA Power Pro (HDX) ## Description ## Truck battery Deta DF1251 PowerPRO 125Ah 850A 12V 12*V* Voltage 125*Ah* Capacity 850*A* Cold cranking 31*kg* Weight The **Deta DF1251 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. It replaces the original battery without adaptation in trucks with a 349 Γ— 175 Γ— 285 mm format: same 125 Ah capacity and the positive terminal on the left. - Conventional lead-acid: the most proven and economical technology. - Heavy Duty construction for intensive professional use. - Powerful cold cranking for large-displacement diesel engines. - Designed for 24 V installations with two batteries in series. ### Dimensions, polarity and mounting In terms of format, the Deta DF1251 measures 349 Γ— 175 Γ— 285 mm (length Γ— width Γ— 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, 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 DF1251 is for The Deta DF1251 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 31 kg and B00 hold-down. ### The Deta DF1251: PowerPRO range and conventional lead-acid technology The **PowerPRO** is the Deta range the DF1251 belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle. 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. ### Deta: the maker behind the DF1251 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. All the Deta batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Official warranty The Deta DF1251 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 On batteries with filler caps, check the electrolyte level and top up only with distilled water. In 24 V installations, check periodically that both batteries show the same voltage; an imbalance means one is failing. ### Delivery times and returns Order **before [[ks:cutoff]]** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **[[ks:return_days]] days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email. ## Frequently asked questions ### How do I fit the DF1251 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 our blog. 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 (βˆ’) 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 β€” with positive on the left match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (βˆ’). On trucks with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How long does the Deta DF1251 battery last? Expected lifespan of the Deta DF1251 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 DF1251 battery? Dimensions (length Γ— width Γ— height) are 349Γ—175Γ—285 mm β€” also written as 349x175x285 mm β€” 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. ### What polarity does the Deta DF1251 battery have? Polarity: positive on the left. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk. ### Is the DF1251 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 β€” we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The DF1251 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the DF1251 model? 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 β€” 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. ## Equivalent batteries - [VARTA J2](https://baterias.com/gb/battery-varta-j2-12v-125ah-720a) - [EXIDE EF1251](https://baterias.com/gb/battery-exide-ef1251-12v-125ah-850a) - [EXIDE EG1251](https://baterias.com/gb/battery-exide-eg1251-12v-125ah-760a) - [TUDOR TF1251](https://baterias.com/gb/battery-tudor-tf1251-12v-125ah-850a) - [TUDOR TG1251](https://baterias.com/gb/battery-tudor-tg1251-12v-125ah-760a) ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team β€” automotive battery specialists since 2012. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-10-19*