Varta B20 · Car battery 12V 45Ah 400A

Varta B20 Dynamic SLI (formerly Black Dynamic) 45Ah 400A 12V Car Battery

The Varta B20 car battery is the 12 V, 45 Ah and 400 A cold cranking (EN) model from Varta's Dynamic SLI (formerly Black Dynamic) range, designed for cars with conventional starting, without a Start-Stop system. Its 207 × 175 × 190 mm dimensions and positive terminal on the left make it the exact replacement for the 45 Ah battery fitted as standard in many cars.

In short: the Varta B20 (45 Ah, 400 A, 207 × 175 × 190 mm, positive terminal on the left). It is a conventional battery for cars without Start-Stop: if yours has Start-Stop, it needs an EFB or AGM battery of the same size. Verified equivalent alternatives: Tudor TB501 and Exide EB501.

• Direct replacement for the original battery in cars without Start-Stop.
• Reliable cold starting thanks to its high cranking current.
• Long service life with normal use and a charging system in good order.
• Maintenance-free lead-acid technology: no need to top up with water.

Vehicles compatible with the Varta B20 battery

This battery is listed as compatible with more than 58 vehicles from manufacturers such as Chevrolet, Seat, Fiat, Fso, Daewoo and Tofas. It is a benchmark option when you need a battery for Chevrolet, Seat or other models that use this same format. It also appears as a replacement in vehicles from Aro, Hyundai, Lancia, Zastava, ZAZ, Yugo, Austin and Kia, among other manufacturers. Not sure whether it is the right one for your car? Check in seconds by entering your registration number in our finder.

Format and fitting of the Varta B20

The Varta B20 is made in the 207 × 175 × 190 mm format and weighs 11,7 kg. The positive terminal on the left determines which side the cables end up on: it is the detail that causes the most purchasing mistakes, so it is worth checking before ordering. It uses a B13 hold-down and terminal 1, the system that secures it to the vehicle's battery tray. Checking the three dimensions and the terminal positions before buying avoids the most common mistake when replacing a battery.

The Varta B20 and the Dynamic SLI range

The Dynamic SLI series (blue label) is Varta's lead-acid line for cars with conventional starting, without Start-Stop. It succeeds the Blue, Silver and Black Dynamic ranges and retains the calcium-silver grid technology that guarantees low self-discharge and reliable cold starting, with no maintenance required.

Designed for the bulk of the car and van fleet, it offers Varta's classic balance between cranking power and durability at a keen price: the logical replacement for the original battery in a car without Start-Stop.

Compared with an EFB or AGM Start-Stop battery, this range prioritises a contained cost and punchy starting in conventional cars. With proper care — avoiding deep discharges and checking the alternator — a battery in this series delivers several years of trouble-free service. This battery used to belong to Varta's Black Dynamic, Silver Dynamic or Black Dynamic range; following the brand's commercial renaming (2025), it forms part of the new Dynamic 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.

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.

Varta's production combines automated lines with verification of more than 100 parameters per unit; that traceability is what underpins its reputation for reliable starting throughout the battery's life.

Manufacturer's warranty

The Varta B20 battery comes with the official manufacturer warranty.

Care and maintenance

To get the most out of it, keep the alternator in good order and avoid leaving lights or accessories on with the engine switched off. Repeated very short journeys are its main enemy: they stop the battery from recharging fully and shorten its life. If the car is going to stand unused for weeks, it is worth disconnecting a terminal or using a trickle charger so it does not discharge below the safe threshold. Checking that the terminals are clean and properly tightened also helps ensure reliable starting.