# Truck battery Varta B39 12V 45Ah 300A ![Truck battery Varta B39 12V 45Ah 300A](https://baterias.com/1427-home_default/battery-varta-b39-12v-45ah-300a.jpg) > Varta B39 truck battery 12V 45Ah 300A. Official Varta Distributor. ProMotive SLI range. Dimensions 210Γ—175Γ—175 mm, + terminal on the right. **Category:** [Truck Batteries](https://baterias.com/gb/batteries-for-truck) β†’ [VARTA](https://baterias.com/gb/varta) - **Canonical URL**: https://baterias.com/gb/battery-varta-b39-12v-45ah-300a - **Language**: en-GB - **Brand**: VARTA - **Reference**: BCOM-VARTA-B39 - **EAN**: 4016987166574 - **MPN**: B39 - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | VARTA | | Reference | B39 | | Model | ProMotive SLI (antes ProMotive HD) | | Voltage (V) | 12 V | | Largo | 207 cm | | Ancho | 175 cm | | Alto | 175 cm | | Peso | 11.05 kg | | TecnologΓ­a | Lead-acid | | EAN | 4016987166574 | | Terminal layout | 0 | | Terminal type | 0 | | Hold down | B13 | | Cold cranking amps (EN) | 300 A | | Capacity (C20) | 45 Ah (c20) | | Additional ETN | 545200030A742 | | Case type | T4 | ## Quick description **Varta B39 12V 45Ah 300A** 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 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 45 Ah C20 πŸ”‹ Cold cranking 300 A EN-1 πŸ“ Dimensions 210Γ—175Γ—175 mm βš™οΈ Technology Lead-acid 🧭 Polarity Positive on the right βš–οΈ Weight 10,76 kg 🏷️ Model ProMotive SLI ## Description ## Varta B39 ProMotive SLI (formerly ProMotive HD) 45Ah 300A 12V Lorry Battery 12*V* Voltage 45*Ah* Capacity 300*A* Cold cranking 11.05*kg* Weight The **Varta B39 lorry battery** is the **12 V**, **45 Ah** model delivering **300 A** of cold cranking power (EN), from Varta's **ProMotive SLI (formerly ProMotive HD)** range, designed for lorries, buses, large vans and machinery. It replaces the original battery in lorries with the 207 Γ— 175 Γ— 175 mm format without any modifications: the same 45 Ah capacity and the same terminal layout (positive on the right). - High cranking current for large-capacity diesel engines. - Tolerance of the vibration of thousands of kilometres on the road. - Reinforced grids and casing for the severe demands of haulage. - Dependable through repeated starts and while powering cab equipment. ### Applications of the Varta B39 battery The Varta B39 covers the needs of lorries, buses, large vans and machinery with 45 Ah of capacity and a construction built for that use. Check that it matches your current battery in dimensions, terminals and hold-down: this reference weighs 11.05 kg and has a B13 hold-down. ### Format and fitting of the Varta B39 In terms of format, the Varta B39 measures 207 Γ— 175 Γ— 175 mm (length Γ— width Γ— height) and weighs 11.05 kg. The positive terminal on the right determines which side the cables sit on: it is the detail that causes the most buying mistakes, so it is worth checking before you order. It uses a B13 hold-down, the system that anchors it to the vehicle's battery tray. Before replacing it, measure the space your current battery occupies: if it matches on all three dimensions and on terminal position, the swap is direct and needs no adapters. ### The Varta B39 and the ProMotive SLI range The **ProMotive SLI** range is Varta's starter series for commercial vehicles β€” lorry, bus and machinery β€” which in the new portfolio brings together the former ProMotive HD (Heavy Duty) and SHD (Super Heavy Duty). It offers a high cranking current for large-capacity diesel engines and a reinforced construction. Its reinforced grids and separators cope with the vibration and cycling of long-distance haulage and of the most severe use, aiming for maximum service life and starting reliability in fleets that work long hours. Commercial vehicles demand a high cranking current and stamina against the vibration of thousands of kilometres. This series uses reinforced grids and a rugged construction to withstand repeated starts of large diesel engines and the draw of the cab's auxiliary equipment. *This battery used to belong to Varta's **ProMotive HD** or **ProMotive SHD** range; following the brand's change of commercial naming (2025), it now forms part of the new **ProMotive SLI** series.* ### Why choose a Varta battery Manufactured by Clarios to German standards, Varta is one of the world's benchmark brands in starter batteries and an OEM supplier to the leading car makers. Choosing it as a replacement guarantees specifications equal to or better than the originals. Varta combines more than a century of experience with the industrial production of Clarios: it is the battery many manufacturers fit as standard and one of the most recommended by workshops. Like every lead-acid battery, it is 100% recyclable. More than 100 manufacturing parameters are checked on every Varta battery before it leaves the plant, a level of rigour that explains why so many workshops and manufacturers trust the brand as their first-choice replacement. ### Manufacturer's warranty The Varta B39 battery comes with the **official manufacturer warranty**. One important warning for commercial vehicles: most lorries carry **two batteries connected in series** (a 24 V installation). If you replace only one, the new battery ends up working alongside the old one β€” which has already lost capacity and has higher internal resistance β€” and that imbalance means one overcharges while the other falls short, shortening the life of the new unit; the manufacturer may regard it as misuse and **void the warranty**. That is why we always recommend changing **both batteries at the same time**. ### Care and maintenance In professional use, checking the state of charge and the battery's hold-down regularly prevents breakdowns on the road. Vibration and the high temperatures of the engine bay are what shorten its life the most, so a secure mounting is key. Keeping the terminals clean and tight and checking the charging system extends battery life in vehicles that clock up long hours. A well-maintained battery reduces the risk of downtime caused by a no-start. ### Technical sheet Download the official technical sheet for this battery with all the manufacturer data. [Download technical sheet (PDF)](https://baterias.com/fichastecnicas/data-sheet-battery-varta-b39-45ah-300a-12v-en.pdf) ## Frequently asked questions ### Why does my lorry have two batteries? Most lorries, buses and tractors run on 24 V with two 12 V batteries connected in series. Always replace both at the same time and with the same model: if one is new and the other old, they become unbalanced and both last less. ### What is the service life of the B39 model? Expected lifespan of the Varta B39 is 4 to 6 years in normal lorry use. 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 size is this battery? Dimensions (length Γ— width Γ— height) are 210Γ—175Γ—175 mm β€” also written as 210x175x175 mm and correspond to the European LB1 case size 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. ### On which side is the positive of the B39 model? Polarity: positive on the right. 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 B39 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 B39 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Varta B39? 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 - [TUDOR TA472](https://baterias.com/gb/battery-tudor-ta472-47ah-450a) - [EXIDE EA472](https://baterias.com/gb/battery-exide-ea472-12v-47ah-450a) - [VARTA C6](https://baterias.com/gb/battery-varta-c6-12v-52ah-520a) - [KRONOBAT MS-52.0](https://baterias.com/gb/best-price-battery-12v-52ah-ms-52_0) ## 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· 2026-10-29*