# Tudor TK508 · Start-Stop battery 12V 50Ah 800A

![Tudor TK508 · Start-Stop battery 12V 50Ah 800A](https://bateriasonline.es/2635-home_default/tudor-tk508.jpg)

> Tudor TK508: 50 Ah Start-Stop battery, 800 A (EN), 260×173×206 mm, AGM. Equivalent to Exide EK508 and Fulmen FK508.

**Category:** [Start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb) → [Tudor](https://bateriasonline.es/en/tudor-batteries)

- **Canonical URL**: https://bateriasonline.es/en/tudor-tk508
- **Language**: en
- **Brand**: Tudor
- **Reference**: BOL-TUDOR-TK508
- **EAN**: 3661024056595
- **MPN**: TK508
- **Price**: 139,47 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Tudor |
| Range | TUDOR AGM |
| Application | Start-Stop cars |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 50 Ah |
| Cold cranking amps (EN) | 800 A |
| Length | 260 mm |
| Width | 173 mm |
| Height | 206 mm |
| Weight | 17.5 kg |
| Terminal layout | 9 |

## Quick description

Tudor TK508: Start-Stop battery (AGM) with 12 V, 50 Ah and 800 A cold cranking current, measuring 260 × 173 × 206 mm.

## Description

## Who the Tudor TK508 is for

The Tudor TK508 is a battery for cars with Start-Stop: it withstands many more starting and partial-discharge cycles than a conventional battery and powers the electronics every time the engine stops at the lights. It takes repeated discharges without losing capacity the way a conventional battery would.
At 50 Ah it covers petrol compacts and small diesels, the best-selling format in Europe. The TK508 belongs to the Tudor TUDOR AGM range. [More Tudor batteries](https://bateriasonline.es/en/tudor-batteries)

## Part numbers and codes for the Tudor TK508

The TK508 is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | TK508 |
|---|---|
| EAN | 3661024056595 |
| Not to be confused with | Tudor TK500 (50 Ah, 570 A, positive terminal on the right) |

## Tudor TK508 vs TK620: differences

What sets the TK508 apart from its neighbours in the Tudor range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Weight |
|---|---|---|---|---|
| Tudor TK508 (this one) | 50 Ah | 800 A | 260 × 173 × 206 | 17.5 kg |
| Tudor TK620 | 62 Ah | 680 A | 242 × 175 × 190 | 17.9 kg |

- Tudor TK620: 12 Ah more, 120 A less cranking power, a different case (242 × 175 × 190 mm).

## Equivalents and alternatives to the Tudor TK508

Other AGM batteries that fit the TK508's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EK508 | AGM | 50 Ah | 800 A | 260 × 173 × 206 |
| Fulmen FK508 | AGM | 50 Ah | 800 A | 260 × 173 × 206 |
| Deta DK508 | AGM | 50 Ah | 800 A | 260 × 173 × 206 |

## AGM technology in the TK508

The TK508 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. It withstands many more cycles than a conventional lead battery, at the cost of being more sensitive to overcharging.

## What to look at before buying the TK508

- The TK508 is AGM: it replaces an AGM or an EFB of the same size. You can swap an EFB for an AGM, but not an AGM for an EFB.
- The TK508 delivers 800 A cold cranking (EN standard); do not go below what your original battery states.
- Capacity of the TK508: 50 Ah; the same as your current battery or slightly more is fine.
- Length, width and height of the TK508: 260 × 173 × 206 mm.

## Frequently asked questions about the Tudor TK508

### TK508 or TK620: which one suits me?

Compared with the TK508, the Tudor TK620 has 12 Ah more and 120 A less cranking power. The TK508 cranks harder; the TK620 is only a good option if your original battery says 680 A or less. Mind the space: the TK620 measures 242 × 175 × 190 mm.

### Can the Tudor TK508 be used in a car with Start-Stop?

Yes. As an AGM battery, the TK508 handles automatic engine stop and brake energy recovery, and it can replace an EFB of the same size.

### How much does the Tudor TK508 weigh?

17.5 kg, with 50 Ah of capacity. For reference, the Tudor TK620 (62 Ah) weighs 17.9 kg.

### Which battery is equivalent to the Tudor TK508?

Only other AGM batteries with its dimensions and polarity: Exide EK508, Fulmen FK508 and Deta DK508. Neither an EFB nor a conventional battery replaces the TK508.

### Why does a Start-Stop battery cost more than a standard one?

Because it uses reinforced plates and separators to withstand thousands of starts and partial discharges. A conventional battery in a Start-Stop car can fail in under a year.

## Other options if you are unsure about the TK508

- [Other start-Stop batteries (AGM and EFB)](https://bateriasonline.es/en/start-stop-batteries-agm-efb)
- [More Tudor models](https://bateriasonline.es/en/tudor-batteries)
- [Exide EK508](https://bateriasonline.es/en/exide-ek508) · 50 Ah, 800 A, 260×173×206 mm
- [Fulmen FK508](https://bateriasonline.es/en/fulmen-fk508) · 50 Ah, 800 A, 260×173×206 mm

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