Varta M6 · Truck battery 12V 170Ah 1000A

Varta M6 ProMotive SLI (formerly ProMotive HD) 170Ah 1000A 12V Lorry Battery

The Varta M6 lorry battery is the 12 V, 170 Ah model delivering 1000 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 × 223 × 223 mm and with the positive terminal on the left, it is the direct replacement for lorries that leave the factory with a 170 Ah battery in this format.

In short: the Varta M6 (170 Ah, 1000 A, 513 × 223 × 223 mm, positive terminal on the left). Verified equivalent alternatives: Varta M12 and Varta M18.

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

Vehicles compatible with the Varta M6 battery

This battery is listed as compatible with more than 368 vehicles from manufacturers such as Fiat, Carraro, Valmet, Case, Valtra and Steyr. If you are looking for a Fiat battery or a Carraro one in these dimensions, the M6 is one of the usual replacement references. The compatibility list also includes models from Same, Case International, Hurlimann, Lamborghini, Zetor, Komatsu, Bolinders - Volvo and Bröyt.

Size and fitting of the Varta M6

Its external dimensions are 513 × 223 × 223 mm and it weighs 43,930 kg. The positive terminal on the left determines which side the cables run to: it is the detail that causes the most buying mistakes, so it is worth checking before ordering. It uses a B00 hold-down and a type 1 terminal, the system that anchors it to the vehicle's battery tray. For the swap to be direct, the space your current battery occupies must respect those three dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will have to change.

The Varta M6 and the ProMotive SLI range

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

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

An industrial vehicle demands a high cranking current and the stamina to shrug off the vibration of thousands of kilometres. This series uses reinforced grids and a rugged construction to handle 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 commercial renaming (2025), it forms part of the new ProMotive SLI series.

Why choose a Varta battery

Choosing Varta means going with the reference the car manufacturer itself signed off on in its day. Against own-brand batteries, the difference is not the purchase price but how many winters the battery lasts before leaving 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.

Varta is Europe's leading manufacturer of starter batteries: its production volume and quality controls guarantee consistent reliability batch after batch, something own-brand makers cannot always assure.

Manufacturer's warranty

The Varta M6 battery comes with the official manufacturer warranty. One important warning for industrial vehicles: most lorries carry two batteries wired 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; that imbalance leaves one overcharged and the other short, shortens the life of the new unit, and the manufacturer may treat it as misuse and void 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 the factors that shorten its life the 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 no-start.