# 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 210×175×175 mm, + terminal on the right. **Category:** [Truck Batteries](https://baterias.com/gb/batteries-for-truck) → [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 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | VARTA | | Reference | B39 | | Model | ProMotive SLI (antes ProMotive HD) | | Voltaje | 12 V | | Largo | 207 cm | | Ancho | 175 cm | | Alto | 175 cm | | Peso | 11.05 kg | | Tecnología | PLOMO/ACIDO | | EAN | 4016987166574 | | Scheme | 0 | | Subjection | B13 | | Arranque en frío CCA EN | 300 A | | Capacidad C20 (Ah) | 45 Ah (c20) | | ETN EXTRA | 545200030A742 | | Box 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 🔌 Voltage 12 V ⚡ Capacity 45 Ah C20 🔋 Cold cranking 300 A EN-1 📏 Dimensions 210×175×175 mm ⚙️ Technology Plomo-Ácido 🧭 Polarity Positivo a la derecha ⚖️ 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 × 175 × 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 × 175 × 175 mm (length × width × 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 — lorry, bus and machinery — 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 **a 1-year official warranty** from the manufacturer. 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 — which has already lost capacity and has higher internal resistance — 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)](/fichastecnicas/data-sheet-battery-varta-b39-45ah-300a-12v-en.pdf) ## Frequently asked questions ### How do I check that the Varta B39 battery fits my vehicle? Three ways: 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 for the B39; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 9:00–18:00 CET). ### How is the Varta B39 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. ### What warranty does the Varta B39 truck battery have? This battery includes 1 year of official manufacturer warranty against manufacturing defects. It covers internal electrical failures and abnormal capacity drops. It does NOT cover misuse (sulfation from heavy duty without proper recharge, alternator overcharge, etc.). On confirmed defect after technical inspection, we replace the B39 at no cost. ### How long does Varta B39 delivery take? In mainland Spain and Portugal it arrives in 24 h if you order before 17:00 and the battery is in stock — it leaves the same day and arrives the next business day. Afternoon or weekend orders ship the next business day. For Balearics, Canaries and other EU destinations, allow 2-5 days. Shipping cost is calculated in the cart based on destination and service (standard, express, cash on delivery). Tracking number is sent by email + SMS as soon as the parcel ships. ### How do I return the B39 model if it doesn't fit? Yes. You have 14 days from delivery to return it. In mainland Spain and Portugal returns are FREE — we cover the return shipping cost via prepaid label. In other EU countries the return shipping cost is the customer's. It must arrive in its original packaging with no signs of installation. If it was defective, the warranty covers replacement even after the 14-day period. ### Where do I find the B39 model online? At baterias.com — authorised distributor with real stock, 24h delivery in mainland Spain and Portugal if you order before 17:00, and full manufacturer warranty. Shipping cost is calculated in the cart based on destination and chosen service (standard, express, cash on delivery). Secure payment by card, Bizum, PayPal or bank transfer. If you choose at-home installation, our technician will take the used battery and dispose of it through an authorised collection point. ### What is the service life of the B39 model? Expected lifespan of the Varta B39 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 size is this battery? Dimensions (length × width × height) are 210×175×175 mm — also written as 210x175x175 mm and correspond to the European LB1 case size — 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. ### How much does the Varta B39 battery weigh? It weighs 10,8 kg. Most of the weight is lead. If you plan to fit it yourself, use gloves and a carrying strap (AGM batteries are slightly heavier than conventional due to the absorbent glass-mat fibre). ### How many amps does the Varta B39 battery have? Nominal capacity 45 Ah[?cca: and [cold-cranking amps 300 A]] at 12 V. Ah measure the total energy available (autonomy); CCA (also written A in cold or EN under the European standard) measure the instantaneous power to crank the starter motor. A battery with more CCA starts better in winter; one with more Ah keeps accessories on for longer. ### 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 — we reply during business hours (Mon–Fri 9:00–18:00 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 — 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. ### Which is better: Varta B39 or an alternative from another brand? This battery and its equivalents from Bosch, Tudor or Exide are technically comparable: same dimensions, same voltage and same capacity. The differences are warranty (Varta and Bosch: 2 years; Tudor and Exide: 2 years on the equivalent line), manufacturing plant (Varta and Bosch share origin in the Clarios Group; Tudor and Exide belong to Exide Technologies) and price. For private use any of these brands will give 4-6 years of life. Compare them in the "Equivalents" section. ### What reviews does the B39 model have? The product rating, when available, is shown on the product page next to the stars. You can also check our public Trustpilot profile at shop level (4.5/5 from 11,447+ verified reviews). Most-praised points: reliable cold start, lifespan above 5 years and fast delivery; most common complaints mention BMS-equipped trucks that need OBD registration after fitting. ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-09-03*