Varta B23 Dynamic SLI · Car battery 45Ah 300A

Varta B23 Dynamic SLI (formerly Black Dynamic) 45Ah 300A 12V Car Battery

The Varta B23 car battery is the 12 V, 45 Ah model with 300 A of cold cranking power (EN) from Varta's Dynamic SLI (formerly Black Dynamic) range, intended for cars with conventional starting, without a Start-Stop system. Its 219 × 135 × 225 mm dimensions and positive terminal on the right make it the exact replacement for the 45 Ah battery fitted as standard in many cars.

In short: the Varta B23 (45 Ah, 300 A, 220 × 135 × 225 mm, positive terminal on the right). 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 TB450 and Exide EB450.

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

Vehicles compatible with the Varta B23 battery

This battery is listed as compatible with more than 33 vehicles from manufacturers such as Piaggio, Marcos, Renault, Hyundai, Nissan and Rover. If you are after a battery for a Piaggio or Marcos in these dimensions, the B23 is one of the usual replacement references. It also appears as a replacement in vehicles from Mazda and Suzuki, among other manufacturers. It covers 20 original equipment references, one of the widest coverages in its format. Not sure whether it is the one for your car? Check in seconds by entering your registration in our finder.

Format and fitting of the Varta B23

The Varta B23 is made in the 219 × 135 × 225 mm format and weighs 10,8 kg. The positive terminal on the right determines which side the cables end up on: it is the detail that causes the most buying mistakes, so it is worth checking before you order. It uses a B01 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 B23 and the Dynamic SLI range

The Dynamic SLI is Varta's entry range for vehicles with traditional starting (without Start-Stop), bringing what used to be the Blue, Silver and Dynamic SLI series together under a single name by technology. Its lead-calcium construction with optimised separators puts the emphasis on punchy starting and a long, maintenance-free life.

It covers the vast majority of conventional petrol and diesel cars on the European market. It is the sensible choice when you want German manufacturing quality without paying the premium for AGM or EFB technology the vehicle does not need.

This series uses lead-acid technology with plates optimised for a good balance between cranking power and service life. It is the natural successor when your car has no Start-Stop and came with a standard battery from new: the same thinking, without paying over the odds for a chemistry you do not need. This battery used to belong to Varta's Dynamic SLI, Dynamic SLI or Dynamic SLI range; following the brand's commercial renaming (2025), it forms part of the new Dynamic SLI series.

Why choose a Varta battery

When a workshop recommends Varta it is not down to marketing: it is one of the brands with the lowest return rates in the sector, with an application coverage spanning practically the whole European fleet, from the city car to the commercial vehicle.

Varta combines more than a century of experience with Clarios's industrial production: it is the battery many manufacturers choose 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 B23 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 the terminal or using a trickle charger so it does not drop below the safe threshold. Making sure the terminals are clean and properly tightened also helps towards reliable starting.