# Tudor TK457 · Auxiliary battery 12V 45Ah 380A

![Tudor TK457 · Auxiliary battery 12V 45Ah 380A](https://bateriasonline.es/2695-home_default/tudor-tk457.jpg)

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

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

- **Canonical URL**: https://bateriasonline.es/en/tudor-tk457
- **Language**: en
- **Brand**: Tudor
- **Reference**: BOL-TUDOR-TK457
- **EAN**: 3661024057745
- **MPN**: TK457
- **Price**: 207,87 € (VAT incl., Spain)
- **Last updated**: 2026-11-07

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Tudor |
| Range | TUDOR 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 | JIS taper post |
| Case size | B24 (238 × 129 × 227 mm) |

## Quick description

The Tudor TK457 is an 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 Tudor TK454.

## Description

## Where the Tudor TK457 fits

The Tudor TK457 is an auxiliary vehicle battery: it powers back-up functions such as Start-Stop, electric steering or the emergency system while the main battery starts the engine. Without it, Start-Stop or back-up warnings appear on the dashboard.
The TK457 belongs to the Tudor TUDOR AGM range. [More Tudor batteries](https://bateriasonline.es/en/tudor-batteries)

## What it means that the TK457 is AGM

The TK457 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the TK457 can be fitted in the boot or under a seat with no risk of spills.

## Tudor TK457 vs TK454

Torn between the TK457 and another similar Tudor? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Tudor TK457 (this one) | 45 Ah | 380 A | 237 × 127 × 227 | left | 13.5 kg |
| Tudor TK454 | 45 Ah | 380 A | 237 × 127 × 227 | right | 13.5 kg |

- The Tudor TK454 is the same battery with the positive terminal on the other side: choose it if your current battery has the positive terminal on the right.

## Equivalents and alternatives to the Tudor TK457

Other AGM batteries that fit the TK457's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EK457 | AGM | 45 Ah | 380 A | 237 × 127 × 227 |

## Part numbers and codes for the Tudor TK457

Look for any of these TK457 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | TK457 |
|---|---|
| EAN | 3661024057745 |
| Case size (EN) | B24 |
| Terminal type | JIS taper post |
| Not to be confused with | Tudor TK454 (45 Ah, 380 A, positive terminal on the right), Tudor TB457 (45 Ah, 330 A) |

## Before ordering the TK457, check this

- The TK457 delivers 380 A cold cranking (EN standard); do not go below what your original battery states.
- Capacity of the TK457: 45 Ah; the same as your current battery or slightly more is fine.
- Polarity of the TK457: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Measure the space: the TK457 takes up 237 × 127 × 227 mm (European case size B24).

## Frequently asked questions about the Tudor TK457

### Tudor TK457 or TK454: what is the difference?

Only the polarity: the TK457 has the positive terminal on the left and the TK454 the positive terminal on the right. Capacity (45 Ah), cranking power and dimensions are identical.

### How much does the Tudor TK457 weigh?

13.5 kg, with 45 Ah of capacity.

### Which battery is equivalent to the Tudor TK457?

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

### What case size is the Tudor TK457?

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

### What is the cold cranking current of the Tudor TK457?

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

### Which charger does the Tudor TK457 need?

A charger with an AGM mode that limits voltage to about 14.4-14.7 V. Never an old unregulated charger: overcharging dries out an AGM beyond repair.

## Other options if you are unsure about the TK457

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

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