# Auxiliary battery Tudor TK143 12V 14Ah 80A AGM

![Auxiliary battery Tudor TK143 12V 14Ah 80A AGM](https://baterias.com/959-home_default/battery-tudor-tk143-12v-14ah-80a.jpg)

> Tudor TK143 auxiliary battery 12V 14Ah 80A AGM. Start-Stop Auxiliary range. Dimensions 150×100×100 mm, + terminal on the left. Check fitment by plate.

**Category:** [Auxiliary Batteries](https://baterias.com/gb/auxiliary-batteries) → [TUDOR](https://baterias.com/gb/tudor)

- **Canonical URL**: https://baterias.com/gb/battery-tudor-tk143-12v-14ah-80a
- **Language**: en-GB
- **Brand**: TUDOR
- **Reference**: BCOM-TUDOR-TK143
- **EAN**: 3661024056618
- **MPN**: TK143
- **Price**: 53,10 € (VAT incl., Spain)
- **Last updated**: 2026-10-28
- **Stock**: In stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | TUDOR |
| Reference | TK143 |
| Model | TUDOR AUXILIAR |
| Voltage (V) | 12 V |
| Largo | 150 mm |
| Ancho | 100 mm |
| Alto | 100 mm |
| Tecnología | AGM |
| EAN | 3661024056618 |
| Terminal layout | Positive terminal on the left |
| Cold cranking amps (EN) | 80 A |
| Capacity (C20) | 14 Ah (c20) |

## Quick description

**Tudor TK143 12V 14Ah 80A** is an AGM support battery designed for daily cycling while keeping voltage stable for the vehicle systems.

## Why this auxiliary battery?

- **Designed for Start-Stop** built for the intensive cycling of modern cars
- **2 to 3 times longer life** vs fitting a cheap conventional battery
- **Fast recovery** recharges in minutes once the engine is running

🔌 Voltage
12 V

⚡ Capacity
14 Ah C20

🔋 Cold cranking
80 A EN-1

📏 Dimensions
150×100×100 mm

⚙️ Technology
AGM

🧭 Polarity
Positive on the left

⚖️ Weight
4,2 kg

🏷️ Model
TUDOR Start-Stop Auxiliary

## Description

## Auxiliary battery Tudor TK143 Auxiliar 14Ah 80A 12V

12*V* Voltage
14*Ah* Capacity
80*A* Cold cranking
4.20*kg* Weight

The **12 V**, **14 Ah** **Tudor TK143** auxiliary battery from the **Auxiliar** range with AGM technology powers the auxiliary network of cars with advanced Start-Stop and heavy electronics. It replaces the original battery without adaptation in vehicles with an auxiliary battery with a 150 × 100 × 100 mm format: same 14 Ah capacity and the positive terminal on the left.
- Sealed AGM: safe when installed in the cabin.
- Maintenance-free.
- AGM technology: absorbed electrolyte, no spills, can be mounted at an angle.
- Stabilises the onboard network voltage.

### What the Tudor TK143 is for

As an auxiliary battery, the Tudor TK143 works alongside the main one; replace it when the vehicle reports a fault in the support network. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 4.20 kg.

### The Tudor TK143: Auxiliar range and AGM technology

The **Auxiliar** is the Tudor range the TK143 belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle.
AGM means the acid is held in a glass mat instead of floating free. That is why the battery can be installed in the cabin without gases, survives more cycles and recovers its charge quickly.

### Dimensions, polarity and mounting

It has external dimensions of 150 × 100 × 100 mm and weighs 4.20 kg. The positive terminal on the left decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.

### Why choose Tudor batteries

Tudor has made batteries in Spain for more than a century and remains one of the brands most trusted by Spanish workshops for reliability and value. We guarantee that every Tudor arrives new, charged and with the manufacturer's full warranty.

### Usage and maintenance tips

The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both. Replace it with the same technology and capacity as the original.

### Manufacturer's warranty

The Tudor TK143 comes with the **manufacturer's official warranty** against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you.

### When you get it and how to return it

Orders placed **before 6:00 pm** with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic Islands and the rest of the European Union allow 3 to 5 working days. You have **14 days** to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships.

## Frequently asked questions

### Is the TK143 model AGM? What does this technology offer?

Yes: the TK143 from Tudor uses AGM (Absorbent Glass Mat) technology, a sealed lead-acid battery whose electrolyte soaks a glass-fibre mat. It is the technology required by cars with advanced Start-Stop and regenerative braking. It withstands more cycles than a conventional battery and copes better with heat.

### Is the TK143 model suitable for Start-Stop cars?

Yes. It is a AGM battery of 14 Ah, designed for vehicles with Start-Stop. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. It works once fitted; on most modern cars, registering it via OBD is advisable so the alternator applies the optimum charging profile. The general recommendation is EFB for basic Start-Stop and AGM where there is regenerative braking (it handles more cycles), unless the car manufacturer says otherwise.

### What is the service life of the TK143 model?

Estimated lifespan of the Tudor TK143: 5 to 8 years in mild-climate car use with Start-Stop. Treat it as an approximate guide, as every case is different. It can vary considerably with usage (short or long journeys), temperature, the condition of the alternator and charging system, power drawn with the engine off and maintenance, plus the car itself and Start-Stop. Cold demands more at every start and intense heat evaporates the electrolyte.

### What are the dimensions of the Tudor TK143 battery?

Measure your car's battery tray first; if the battery exceeds it by even a millimetre, the hold-down clamp may not close. Length × width × height: 150x100x100 mm. Height is measured to the top of the terminals.

### Which side is the positive terminal on this battery?

The TK143 has the positive on the left: that is its polarity. Face the battery with its terminals nearest you and see which side the positive post (+, red ring) is on. Compare it with the battery you are replacing: if it does not match, cables must be lengthened or the system reconfigured, with a risk of short circuit.

### Is the TK143 valid for my vehicle?

Not sure? Try your number plate in the finder (DGT/DVLA/KBA detect model and engine) or the "Compatible vehicles" tab, checked by our technical team; if your car is not there, send us make, model, engine and year on WhatsApp and we will reply during business hours (Mon–Fri 10:00–13:30 and 16:30–18:00 (Spanish time, CET)). If our table and the car handbook disagree, go with what the manufacturer says.

### Which interchangeable batteries are there for this one?

To replace the Tudor TK143 without modifications, the other battery must be identical in size, polarity, Ah and CCA. Not just any technology will do: an EFB cannot be replaced with a conventional battery in Start-Stop cars. The "Equivalents" section further down lists the recommended alternatives.

### Tudor TK143 or Exide EK143: which one to choose?

It is the verified Exide equivalent for the TK143 tray. Compared with the TK143 it has the same Ah and cranking power. It costs 11,90 € less. Decide by price, brand preference and availability: both fit and crank the same.

### Why choose AGM instead of EFB for my Start-Stop car?

For regenerative braking systems such as BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO or Volvo i-Stop, AGM is the recommendation; it also copes better than an EFB with tilting, vibration and extreme temperatures. Many more charge/discharge cycles than a conventional battery and no leaks: that is what AGM technology brings, with the electrolyte absorbed in glass fibre. This TK143 delivers 80 A cold cranking (EN).

### Is there anything to do after replacing a Start-Stop battery?

It is not strictly necessary on most cars, because the alternator detects the change and adapts the charge. The advisable step is to register it via OBD: the charging profile is optimum from the first minute and the battery lasts longer, especially on brands with sophisticated BMS (BMW, Mercedes, Audi, Volvo, Land Rover). Any garage with an OBD scanner can do it in a few minutes. If you prefer to do it yourself: VCDS / Carista (VAG), Bimmercode (BMW) or iCarsoft. If you do not register the TK143, it will keep starting fine while the alternator adjusts the profile over a few days.


## Equivalent batteries

- [EXIDE EK143](https://baterias.com/gb/battery-exide-ek143-12v-14ah-80a)

## Technical team (editorial authorship)

The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2012.

→ https://baterias.com/gb/technical-team

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*baterias.com — Automotive batteries · 2026-11-09*