Varta B31 Dynamic SLI (formerly Blue Dynamic) 45Ah 330A 12V Car Battery
12VVoltage
45AhCapacity
330ACold cranking
11,7kgWeight
The Varta B31 car battery is the 12 V, 45 Ah model with 330 A of cold cranking power (EN) from Varta's Dynamic SLI (formerly Blue Dynamic) range, intended for cars with conventional starting, without a Start-Stop system. Measuring 238 × 129 × 227 mm and with the positive terminal on the right, it is the direct replacement for cars fitted from the factory with a 45 Ah battery in this format.
- Reliable cold starting thanks to its high cranking current.
- Direct replacement for the original battery in cars without Start-Stop.
- Maintenance-free lead-acid technology: no topping up with water.
- Long service life with normal use and a charging system in good order.
Vehicles compatible with the Varta B31 battery
This battery is listed as compatible with more than 120 vehicles from manufacturers such as Toyota, Nissan, Suzuki, Honda, Daihatsu and Subaru. For anyone who needs to change the battery in their Toyota or Nissan, this Varta B31 reproduces the original specifications. It also appears as a replacement in vehicles from Mazda, Hafei, Kia, Geo, Lexus, Isuzu, Proton and Audi, among other manufacturers. 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 B31
Its external dimensions are 238 × 129 × 227 mm and it weighs 11,7 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 B00 hold-down and terminal 3, 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 B31 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 keeps the calcium-silver grid technology that guarantees low self-discharge and reliable cold starting, with no maintenance required.
Aimed at the bulk of the car and van fleet, it offers Varta's classic balance between cranking power and durability at a moderate 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 puts the emphasis on a keen price and punchy starting in conventional cars. With proper care — avoiding deep discharges and checking the alternator — a battery from this series delivers several years of trouble-free service. This battery used to belong to Varta's Blue 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
Choosing Varta means sticking with the reference the car manufacturer itself approved in the first place. Against own-brand batteries, the difference is not in the purchase price but in 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'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 B31 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.
