# Varta B24 · Car battery 12V 45Ah 300A

![Varta B24 · Car battery 12V 45Ah 300A](https://bateriasonline.es/1203-home_default/varta-b24.jpg)

> Varta B24 (ETN 545079030): 45 Ah car battery, 300 A (EN), 220×135×225 mm, positive terminal on the left. Equivalent to Exide EB451.

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

- **Canonical URL**: https://bateriasonline.es/en/varta-b24
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-B24
- **EAN**: 4016987167731
- **MPN**: B24
- **Price**: 79,49 € (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) | 300 A |
| Length | 220 mm |
| Width | 135 mm |
| Height | 225 mm |
| Weight | 10.7 kg |
| Polarity | Positive terminal on the left |
| ETN code | 545079030 |

## Quick description

Varta B24 (ETN 545 079 030, also written B 24 or 545079030): car battery with 12 V, 45 Ah and 300 A cold cranking current, measuring 220 × 135 × 225 mm, with the positive terminal on the left. If yours has the positive terminal on the right, you need the Varta B23.

## Description

## Where the Varta B24 fits

The Varta B24 is a starter battery for cars without Start-Stop: it delivers the current the starter motor needs and then powers lights, control units and audio with the engine off. The B24 covers the daily routine of a car without automatic engine stop: cold starts, short trips and loads with the ignition off.
At 45 Ah it is a small size: the usual choice for petrol superminis and city cars with little equipment. Varta lists the B24 in its Dynamic SLI line. [The full range of Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Varta B24 vs B33, B23 and B34: differences

The real differences between the B24 and the closest Varta models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta B24 (this one) | 45 Ah | 300 A | 220 × 135 × 225 | left | 10.7 kg |
| Varta B33 | 45 Ah | 330 A | 238 × 129 × 227 | left | 11.3 kg |
| Varta B23 | 45 Ah | 300 A | 220 × 135 × 225 | right | 10.7 kg |
| Varta B34 | 45 Ah | 330 A | 238 × 129 × 227 | left | 11.3 kg |

- Varta B33: the same capacity, 30 A more cranking power, a different case (238 × 129 × 227 mm).
- If the positive terminal of your battery is on the other side, the one you need is the Varta B23 (positive terminal on the right).
- Varta B34: the same capacity, 30 A more cranking power, a different case (238 × 129 × 227 mm).

## Part numbers and codes for the Varta B24

Look for any of these B24 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | B24 (B 24) |
|---|---|
| ETN code | 545079030 (also 545 079 030) |
| EAN | 4016987167731 |
| Case size according to Varta | E2R |
| UK code | 049 |
| Base hold-down | B01 |
| Also known as | Varta B 24 · Varta 545079030 · Varta 545 079 030 |
| Not to be confused with | Varta B20 (45 Ah, 400 A), Varta B23 (45 Ah, 300 A, positive terminal on the right), Varta B34 (45 Ah, 330 A) |

## Equivalents and alternatives to the Varta B24

Batteries that fit the B24's tray with the same polarity; besides other conventional batteries, an EFB or AGM of this size is a valid upgrade for the B24.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Kronobat SD-45.1T | Lead-acid | 45 Ah | 300 A | 219 × 135 × 225 |
| Exide EB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |
| Tudor TB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |
| Fulmen FB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |
| Deta DB451 | Lead-acid | 45 Ah | 330 A | 220 × 135 × 225 |

## What to look at before buying the B24

- Measure the space: the B24 takes up 220 × 135 × 225 mm.
- With the terminals facing you, the positive terminal of the B24 is on the left.
- Capacity of the B24: 45 Ah; the same as your current battery or slightly more is fine.
- Check the EN amps on your battery: if it says 300 A or less, the B24 covers your engine.
- If your car has Start-Stop, the B24 is not the right one: it needs an EFB or an AGM.

## Inside the B24: lead-acid technology

The B24 is a conventional lead-acid battery, with plates immersed in liquid electrolyte. In cars without energy management, the B24 needs no special registration: just connect it.

## Frequently asked questions about the Varta B24

### B24 or B33: which one suits me?

Compared with the B24, the Varta B33 has 30 A more cranking power. If your current battery says 330 A or more, choose the B33; if it says 300 A or less, the B24 is enough. Mind the space: the B33 measures 238 × 129 × 227 mm.

### Varta B24 or B23: what is the difference?

Only the polarity: the B24 has the positive terminal on the left and the B23 the positive terminal on the right. Capacity (45 Ah), cranking power and dimensions are identical. That is why their ETNs only differ in the middle group: 545 079 030 for the B24 and 545 077 030 for the B23.

### What does the code 545 079 030 on the Varta B24 mean?

It is its ETN (European Type Number), also written 545079030. 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 (079) identifies the specific model within that capacity, and the last three digits (030) multiplied by 10 give the cold cranking current: 300 A. Its twin with the positive terminal on the other side, the Varta B23, is 545 077 030: only the middle group changes.

### Can the Varta B24 be used in a car with Start-Stop?

No. The B24 is a lead-acid battery for cars without automatic engine stop; Start-Stop needs an EFB or an AGM.

### How much does the Varta B24 weigh?

10.7 kg, with 45 Ah of capacity. For reference, the Varta B33 (45 Ah) weighs 11.3 kg.

### Which battery is equivalent to the Varta B24?

With the same dimensions, polarity and similar capacity you have the Kronobat SD-45.1T, Exide EB451 and Tudor TB451. As the B24 is a conventional battery, an EFB or AGM of the same size also works.

### How long does a car battery like the Varta B24 last?

Between 4 and 6 years in normal use. Very short trips, extreme heat and leaving the car parked for weeks without starting it shorten its life.

## Other options if you are unsure about the B24

- [More car batteries](https://bateriasonline.es/en/car-batteries)
- [Full Varta catalogue](https://bateriasonline.es/en/varta-batteries)
- [Kronobat SD-45.1T](https://bateriasonline.es/en/kronobat-sd-45-1t) · 45 Ah, 300 A, 219×135×225 mm
- [Exide EB451](https://bateriasonline.es/en/exide-eb451) · 45 Ah, 330 A, 220×135×225 mm

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