Varta K8 · Truck battery 12V 140Ah 800A

Varta K8 ProMotive SLI (formerly ProMotive HD) 140Ah 800A 12V Lorry Battery

The Varta K8 lorry battery is the 12 V, 140 Ah model delivering 800 A of cold cranking power (EN), from Varta's ProMotive SLI (formerly ProMotive HD) range, designed for lorries, buses, large vans and machinery. Measuring 513 × 189 × 223 mm with the positive terminal on the left, it is the direct replacement for lorries that leave the factory with a 140 Ah battery in this format.

• High cranking current for large-capacity diesel engines.
• Withstands 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.

Vehicles compatible with the Varta K8 battery

According to our database, the Varta K8 is fitted to more than 360 vehicles from makes such as Fiat, Deutz-Fahr, Fendt, Claas, John Deere and Massey Ferguson, among others. If you are looking for a battery for a Fiat or a Deutz-Fahr with these dimensions, the K8 is one of the usual replacement references. It also appears as a replacement in vehicles from Case, Gueldner, Bührer, Stavostroj, Steyr, Timberjack, Bourgoin and Komatsu, among other manufacturers.

Format and fitting of the Varta K8

Its external dimensions are 513 × 189 × 223 mm and it weighs 37.4 kg. The positive terminal on the left determines which side the cables end up on: this is the detail behind more wrong purchases than any other, so it is worth checking before you order. It takes a B03 hold-down and terminal 1, 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 K8 and the ProMotive SLI range

The ProMotive SLI series is Varta's starter line for professional transport, bringing the former ProMotive HD and SHD together under a single name. It is built to crank large-capacity diesel engines and to take the daily punishment of the lorry, the bus and site machinery.

The key to this range is sheer toughness: reinforced plates and mountings that resist thousands of kilometres of vibration and deep discharge cycles, keeping fleet downtime from starting failures to a minimum.

Commercial vehicles demand high cranking current and endurance against the vibration of thousands of kilometres. This series uses reinforced grids and a robust construction to cope with repeated starts of large diesel engines and with 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 commercial renaming (2025), it now forms part of the new ProMotive SLI series.

Why choose a Varta battery

Choosing Varta means sticking with the reference the vehicle manufacturer itself signed off in the first place. Against own-brand batteries, the difference is not the purchase price but how many winters the battery lasts before it leaves you stranded.

Varta batteries are made under the Clarios group with German technology and quality controls that make them one of the best-selling choices in Europe. As a lead battery, it is 100% recyclable through any collection point.

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 K8 battery comes with the official manufacturer warranty. An important warning for commercial vehicles: most lorries run 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, shortens the life of the new unit and may be treated by the manufacturer as improper use, voiding the warranty. That is why it is always advisable to change both batteries at the same time.

Care and maintenance

In professional use, checking the state of charge and the battery hold-down regularly prevents breakdowns on the road. Vibration and the high temperatures of the engine bay are what shortens a battery's life most, so 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 battery that will not start the engine.