Varta K7 · Truck battery 12V 145Ah 800A

Varta K7 ProMotive SLI (formerly ProMotive HD) 145Ah 800A 12V Lorry Battery

The Varta K7 lorry battery is the 12 V, 145 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. Its 513 × 189 × 223 mm dimensions and positive terminal on the left make it the exact replacement for the 145 Ah battery fitted as standard in many lorries.

• Reinforced grids and casing for the severe demands of haulage.
• Dependable through repeated starts and while powering cab equipment.
• High cranking current for large-capacity diesel engines.
• Withstands the vibration of thousands of kilometres on the road.

Vehicles compatible with the Varta K7 battery

The Varta K7 is compatible with more than 948 vehicles: it is fitted as standard or as a replacement by makes such as Fiat, Deutz-Fahr, Volvo, Fendt, John Deere and New Holland. It is a benchmark choice when you need a battery for a Fiat, a Deutz-Fahr or other models built around this same format. It also appears as a replacement in vehicles from Komatsu, Claas, Khd, Gueldner, Case, Caterpillar, Bourgoin and Stavostroj, among other manufacturers. It has been cross-checked against 2 original equipment references from different manufacturers.

Format and fitting of the Varta K7

Its external dimensions are 513 × 189 × 223 mm and it weighs 37 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 B00 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 K7 and the ProMotive SLI range

The ProMotive SLI range is Varta's starter series for commercial vehicles — lorries, buses and machinery — and in the new portfolio it unifies the former ProMotive HD (Heavy Duty) and SHD (Super Heavy Duty). It offers high cranking current for large-capacity diesel engines and a reinforced construction.

Its reinforced grids and separators stand up to 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.

Compared with a car battery, this range is calibrated for severe, continuous use: greater mechanical strength and more tolerance of cycling and of the knocks of the road. It is the correct replacement for a lorry, bus or machine working long shifts. 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

Varta is a byword for reliability: original equipment in a great many European vehicles and one of the most proven brands on the market. Replacing your battery with a Varta restores OEM quality — the same performance as the factory-fitted unit — with the manufacturer's backing behind it.

Behind Varta is Clarios, one of the largest manufacturers of starter batteries in the world and a supplier to the assembly lines of numerous car brands. That German engineering heritage translates into reliable starting year after year.

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 K7 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.