# Marine battery Tudor TZ850 12V 100Ah 900A EFB

![Marine battery Tudor TZ850 12V 100Ah 900A EFB](https://baterias.com/4658-home_default/battery-tudor-tz850-12v-100ah.jpg)

> Tudor TZ850 marine battery 12V 100Ah 900A EFB. Marina & Leisure Dual EFB range. Dimensions 353×175×190 mm, + terminal on the right. Cranking and house duties.

**Category:** [BARCO](https://baterias.com/gb/barco) → [TUDOR](https://baterias.com/gb/tudor)

- **Canonical URL**: https://baterias.com/gb/battery-tudor-tz850-12v-100ah
- **Language**: en-GB
- **Brand**: TUDOR
- **Reference**: BCOM-TUDOR-TZ850
- **EAN**: 3661024057608
- **MPN**: TZ850
- **Stock**: Out of stock

## Technical specifications

| Feature | Value |
|---|---|
| Largo | 353 mm |
| Ancho | 175 mm |
| Alto | 190 mm |
| Peso | 25.5 kg |
| Tecnología | EFB |
| EAN | 3661024057608 |
| Scheme | Positivo Derecha |
| Terminal | EN taper post |
| Subjection | B13 |
| Arranque en frío CCA EN | 900 A |
| Capacidad C20 (Ah) | 100 Ah (c20) |

## Quick description

**Tudor TZ850 12V 100Ah 900A** is a marine battery with reinforced anti-vibration case for moorings and offshore use. Tolerates the typical daily cycles on a boat (engine start + night-time services such as lights, sonar, fridge) and holds voltage even when the hull is rolling in open sea.

### Why this marine battery?

- **Marine design** built for boat swell and vibration
- **Dual function** starts the engine and powers onboard services
- **Sealed and safe** maintenance-free even when the boat rolls

🔌 Voltage
12 V

⚡ Capacity
100 Ah C20

🔋 Cold cranking
900 A EN-1

📏 Dimensions
353×175×190 mm

⚙️ Technology
EFB

🧭 Polarity
Positivo a la derecha

⚖️ Weight
25,5 kg

🏷️ Model
TUDOR Marina & Leisure Dual EFB

## Description

## Marine battery EFB Tudor TZ850 12V 100Ah 900A

The **Tudor TZ850** 100Ah 900A 12V battery belongs to Tudor's marine and leisure range. Designed for boats and leisure applications, it combines starting power and service capacity to power engines and on-board equipment with complete reliability.

### Ideal for:

- Boats and vessels
- Outboard motors
- Motorhomes and campervans
- On-board equipment (sounders, lights, fridges)

### Benefits and features of the Tudor TZ850 battery

- Dual purpose: starting and service
- Resistant to the vibration of the marine environment
- Withstands frequent discharge and recharge
- Maintenance-free
- Long service life
- Safe and spill-proof

### How to choose the right battery for your vehicle?

In recent years, the energy requirements of vehicles have increased by almost 300%. To get it right, it is essential to consider not only the engine's power and displacement, but also the equipment, the climate and your driving style. The extensive Tudor battery range offers a complete and varied catalogue to meet the electrical demands of any vehicle or device. If you cannot find the battery you need or have any doubts about which to choose, please do not hesitate to contact us.

## Frequently asked questions

### How do I know if the TZ850 model fits my car?

Three ways: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team for the TZ850; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 9:00–18:00 CET).

### How is the Tudor TZ850 battery installed in the vehicle?

In most cars it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.

### What warranty does the Tudor TZ850 battery have?

We provide 2 years of official manufacturer warranty against manufacturing defects. It covers cell failures, internal short-circuits and abnormal capacity drops. Wear from misuse (prolonged overcharging, wrong charger or faulty alternator) is not covered. On confirmed defect after technical inspection, we replace the TZ850 model at no cost.

### When will I receive the TZ850 model?

In mainland Spain and Portugal it arrives in 24 h if you order before 17:00 and the battery is in stock — it leaves the same day and arrives the next business day. Afternoon or weekend orders ship the next business day. For Balearics, Canaries and other EU destinations, allow 2-5 days. Shipping cost is calculated in the cart based on destination and service (standard, express, cash on delivery). Tracking number is sent by email + SMS as soon as the parcel ships.

### How do I return the TZ850 model if it doesn't fit?

Yes. You have 14 days from delivery to return it. In mainland Spain and Portugal returns are FREE — we cover the return shipping cost via prepaid label. In other EU countries the return shipping cost is the customer's. It must arrive in its original packaging with no signs of installation. If it was defective, the warranty covers replacement even after the 14-day period.

### Where do I find the TZ850 model online?

At baterias.com — authorised distributor with real stock, 24h delivery in mainland Spain and Portugal if you order before 17:00, and full manufacturer warranty. Shipping cost is calculated in the cart based on destination and chosen service (standard, express, cash on delivery). Secure payment by card, Bizum, PayPal or bank transfer. If you choose at-home installation, our technician will take the used battery and dispose of it through an authorised collection point.

### How many years does this battery last?

Expected lifespan of the Tudor TZ850 is 4 to 7 years in regular use (depends on technology and climate). In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.

### What are the dimensions of the Tudor TZ850 battery?

Dimensions (length × width × height) are 353×175×190 mm — also written as 353x175x190 mm and correspond to the European L5 case size — following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.

### How much does the Tudor TZ850 battery weigh?

It weighs 25,5 kg. Most of the weight is lead. If you plan to fit it yourself, use gloves and a carrying strap (AGM batteries are slightly heavier than conventional due to the absorbent glass-mat fibre).

### Which batteries are equivalent to the Tudor TZ850?

Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop cars. See the "Equivalents" section to view recommended options at the same performance level.

### Which is better: Tudor TZ850 or an alternative from another brand?

This battery and its equivalents from Bosch, Tudor or Exide are technically comparable: same dimensions, same voltage and same capacity. The differences are warranty (Varta and Bosch: 2 years; Tudor and Exide: 2 years on the equivalent line), manufacturing plant (Varta and Bosch share origin in the Clarios Group; Tudor and Exide belong to Exide Technologies) and price. For private use any of these brands will give 4-6 years of life. Compare them in the "Equivalents" section.

### What do users say about the Tudor TZ850 battery?

The product rating, when available, is shown on the product page next to the stars. You can also check our public Trustpilot profile at shop level (4.5/5 from 11,031+ verified reviews). Most-praised points: reliable cold start, lifespan above 5 years and fast delivery; most common complaints mention BMS-equipped cars that need OBD registration after fitting.


## Technical team (editorial authorship)

The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries.

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

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*baterias.com — Automotive batteries · 2026-08-07*