# Varta B31 · Car battery 12V 45Ah 330A

![Varta B31 · Car battery 12V 45Ah 330A](https://bateriasonline.es/1212-home_default/varta-b31.jpg)

> Varta B31 (ETN 545155033): 45 Ah car battery, 330 A (EN), 238×129×227 mm, positive terminal on the right, B24 case. Equivalent to Exide EB454.

**Category:** [Car batteries](https://bateriasonline.es/en/car-batteries) → [Varta](https://bateriasonline.es/en/varta-batteries)

- **Canonical URL**: https://bateriasonline.es/en/varta-b31
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-B31
- **EAN**: 4016987167526
- **MPN**: B31
- **Price**: 46,37 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA Dynamic SLI |
| Application | Cars |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 45 Ah |
| Cold cranking amps (EN) | 330 A |
| Length | 238 mm |
| Width | 129 mm |
| Height | 227 mm |
| Weight | 11.3 kg |
| Polarity | Positive terminal on the right |
| Case size | B24 (238 × 129 × 227 mm) |
| ETN code | 545155033 |

## Quick description

Varta B31 (ETN 545 155 033, also written B 31 or 545155033): car battery with 12 V, 45 Ah and 330 A cold cranking current, case size B24 (238 × 129 × 227 mm), with the positive terminal on the right. Need the positive terminal on the left? The same battery is the Varta B33.

## Description

## The Varta B31 at a glance

The Varta B31 is made for petrol and diesel cars without automatic engine stop. If your car has no Start-Stop and had a 45 Ah battery, the B31 is a direct replacement.
At 45 Ah it is a small size: the usual choice for petrol superminis and city cars with little equipment. In the Varta catalogue, the B31 belongs to the Dynamic SLI line. [More Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Part numbers and codes for the Varta B31

This is how the Varta B31 appears on the label and in parts catalogues:

| Commercial reference | B31 (B 31) |
|---|---|
| ETN code | 545155033 (also 545 155 033) |
| EAN | 4016987167526 |
| Case size (EN) | B24 |
| UK code | 156 |
| Base hold-down | B00 |
| Also known as | Varta B 31 · Varta 545155033 · Varta 545 155 033 |
| Not to be confused with | Varta B33 (45 Ah, 330 A, positive terminal on the left), Varta B34 (45 Ah, 330 A, positive terminal on the left), Varta B36 (44 Ah, 420 A) |

## Varta B31 vs B23, B33 and A14: differences

The real differences between the B31 and the closest Varta models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta B31 (this one) | 45 Ah | 330 A | 238 × 129 × 227 | right | 11.3 kg |
| Varta B23 | 45 Ah | 300 A | 220 × 135 × 225 | right | 10.7 kg |
| Varta B33 | 45 Ah | 330 A | 238 × 129 × 227 | left | 11.3 kg |
| Varta A14 | 40 Ah | 330 A | 187 × 127 × 227 | right | 9.49 kg |

- Varta B23: the same capacity, 30 A less cranking power, a different case (220 × 135 × 225 mm).
- If the positive terminal of your battery is on the other side, the one you need is the Varta B33 (positive terminal on the left).
- Varta A14: 5 Ah less, the same cranking power, a different case (187 × 127 × 227 mm).

## Equivalents and alternatives to the Varta B31

Batteries that fit the B31's tray with the same polarity; besides other conventional batteries, an EFB or AGM of this size is a valid upgrade for the B31.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Kronobat PB-45.0F | Lead-acid | 45 Ah | 330 A | 238 × 129 × 227 |
| Kronobat PB-45.0T | Lead-acid | 45 Ah | 330 A | 238 × 129 × 227 |
| Exide EB454 | Lead-acid | 45 Ah | 330 A | 237 × 127 × 227 |
| Exide EB456 | Lead-acid | 45 Ah | 330 A | 237 × 127 × 227 |
| Tudor TB454 | Lead-acid | 45 Ah | 330 A | 237 × 127 × 227 |
| Tudor TB456 | Lead-acid | 45 Ah | 330 A | 237 × 127 × 227 |

## What it means that the B31 is lead-acid

Inside, the B31 is classic lead-acid: liquid electrolyte and lead plates. If the B31 is left discharged for weeks it sulphates: a maintenance charger prevents this.

## Before ordering the B31, check this

- If your car has Start-Stop, the B31 is not the right one: it needs an EFB or an AGM.
- Cold cranking: 330 A (EN), equal to or higher than the original.
- Your current battery should say about 45 Ah; a little more is also fine.
- With the terminals facing you, the positive terminal of the B31 is on the right.
- The B31 needs 238 × 129 × 227 mm of space (European case size B24): measure it with the hold-down clamp in place.

## Frequently asked questions about the Varta B31

### B31 or B23: which one suits me?

Compared with the B31, the Varta B23 has 30 A less cranking power. The B31 cranks harder; the B23 is only a good option if your original battery says 300 A or less. Mind the space: the B23 measures 220 × 135 × 225 mm.

### Varta B31 or B33: what is the difference?

Only the polarity: the B31 has the positive terminal on the right and the B33 the positive terminal on the left. Capacity (45 Ah), cranking power and dimensions are identical. That is why their ETNs only differ in the middle group: 545 155 033 for the B31 and 545 157 033 for the B33.

### What does the code 545 155 033 on the Varta B31 mean?

It is its ETN (European Type Number), also written 545155033. The first three digits (545) encode voltage and capacity: 12 V and 45 Ah (5xx = under 100 Ah, 6xx = 100 to 199 Ah, 7xx = 200 Ah or more). The middle group (155) identifies the specific model within that capacity, and the last three digits (033) multiplied by 10 give the cold cranking current: 330 A. Its twin with the positive terminal on the other side, the Varta B33, is 545 157 033: only the middle group changes.

### Can the Varta B31 be used in a car with Start-Stop?

No. The B31 is a lead-acid battery for cars without automatic engine stop; Start-Stop needs an EFB or an AGM.

### How much does the Varta B31 weigh?

11.3 kg, with 45 Ah of capacity. For reference, the Varta B23 (45 Ah) weighs 10.7 kg.

### Which battery is equivalent to the Varta B31?

With the same dimensions, polarity and similar capacity you have the Kronobat PB-45.0F, Kronobat PB-45.0T and Exide EB454. As the B31 is a conventional battery, an EFB or AGM of the same size also works.

### What case size is the Varta B31?

Case size B24: 238 × 129 × 227 mm. The B31 fits any standard B24 battery tray such as the Kronobat PB-45.0F.

## Keep comparing: alternatives to the B31

- [All car batteries](https://bateriasonline.es/en/car-batteries)
- [Full Varta catalogue](https://bateriasonline.es/en/varta-batteries)
- [Kronobat PB-45.0F](https://bateriasonline.es/en/kronobat-pb-45-0f) · 45 Ah, 330 A, 238×129×227 mm
- [Kronobat PB-45.0T](https://bateriasonline.es/en/kronobat-pb-45-0t) · 45 Ah, 330 A, 238×129×227 mm

---
*bateriasonline.es — Batteries and accessories · 2026-11-10*