# Exide EK457 · Auxiliary battery 12V 45Ah 380A

![Exide EK457 · Auxiliary battery 12V 45Ah 380A](https://bateriasonline.es/352-home_default/exide-ek457.jpg)

> Exide EK457: 45 Ah auxiliary battery, 380 A (EN), 237×127×227 mm, positive terminal on the left, B24 case, AGM. Equivalent to Tudor TK457.

**Category:** [Auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries) → [Exide](https://bateriasonline.es/en/exide-batteries)

- **Canonical URL**: https://bateriasonline.es/en/exide-ek457
- **Language**: en
- **Brand**: Exide
- **Reference**: BOL-EXIDE-EK457
- **EAN**: 3661024038089
- **MPN**: EK457
- **Price**: 208,15 € (VAT incl., Spain)
- **Last updated**: 2026-11-07

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Exide |
| Range | EXIDE AGM |
| Application | Auxiliary and back-up use |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 45 Ah |
| Cold cranking amps (EN) | 380 A |
| Length | 237 mm |
| Width | 127 mm |
| Height | 227 mm |
| Weight | 13.5 kg |
| Polarity | Positive terminal on the left |
| Terminal type | /eu/sites/default/files/sharepoint/ROZaV1bm9ZUA9adtg0inxHSTW3kqnm_ZoI9oz2 BNXSs-large.png?itoktzHlGQUr |
| Case size | B24 (238 × 129 × 227 mm) |

## Quick description

Exide EK457: auxiliary battery (AGM) with 12 V, 45 Ah and 380 A cold cranking current, case size B24 (237 × 127 × 227 mm), with the positive terminal on the left. With the positive terminal on the right, the exact counterpart is the Exide EK454.

## Description

## The Exide EK457 at a glance

The Exide EK457 is the second battery fitted in many modern cars. Without it, Start-Stop or back-up warnings appear on the dashboard.
The EK457 belongs to the Exide EXIDE AGM range. [See all Exide batteries](https://bateriasonline.es/en/exide-batteries)

## What it means that the EK457 is AGM

Inside, the EK457 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Exide EK457 vs EK454: differences

The real differences between the EK457 and the closest Exide models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Exide EK457 (this one) | 45 Ah | 380 A | 237 × 127 × 227 | left | 13.5 kg |
| Exide EK454 | 45 Ah | 380 A | 237 × 127 × 227 | right | 13.5 kg |

- If the positive terminal of your battery is on the other side, the one you need is the Exide EK454 (positive terminal on the right).

## Equivalents and alternatives to the Exide EK457

Other AGM batteries that fit the EK457's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Tudor TK457 | AGM | 45 Ah | 380 A | 237 × 127 × 227 |

## Part numbers and codes for the Exide EK457

Shops, garages and catalogues identify the EK457 with these codes:

| Commercial reference | EK457 |
|---|---|
| EAN | 3661024038089 |
| Case size (EN) | B24 |
| Terminal type | /eu/sites/default/files/sharepoint/ROZaV1bm9ZUA9adtg0inxHSTW3kqnm_ZoI9oz2BNXSs-large.png?itoktzHlGQUr |
| Not to be confused with | Exide EB457 (45 Ah, 330 A), Exide EK454 (45 Ah, 380 A, positive terminal on the right) |

## Check this before ordering the Exide EK457

- Check the EN amps on your battery: if it says 380 A or less, the EK457 covers your engine.
- Capacity of the EK457: 45 Ah; the same as your current battery or slightly more is fine.
- With the terminals facing you, the positive terminal of the EK457 is on the left.
- Length, width and height of the EK457: 237 × 127 × 227 mm (European case size B24).

## Frequently asked questions about the Exide EK457

### Exide EK457 or EK454: what is the difference?

Only the polarity: the EK457 has the positive terminal on the left and the EK454 the positive terminal on the right. Capacity (45 Ah), cranking power and dimensions are identical.

### How much does the Exide EK457 weigh?

13.5 kg, with 45 Ah of capacity.

### Which battery is equivalent to the Exide EK457?

Only other AGM batteries with its dimensions and polarity: Tudor TK457. Neither an EFB nor a conventional battery replaces the EK457.

### What case size is the Exide EK457?

Case size B24: 237 × 127 × 227 mm. The EK457 fits any standard B24 battery tray such as the Tudor TK457.

### What is the cold cranking current of the Exide EK457?

380 A to the EN standard, with 45 Ah capacity.

### Is the auxiliary battery replaced together with the main one?

Not necessarily, but they usually age together. If the main battery is over five years old, check the auxiliary one too.

## Keep comparing: alternatives to the EK457

- [More auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries)
- [Full Exide catalogue](https://bateriasonline.es/en/exide-batteries)
- [Exide EK500](https://bateriasonline.es/en/exide-ek500) · 50 Ah, 570 A, 207×175×190 mm

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