# Tudor TZ850 · Boat battery 12V 100Ah 900A

![Tudor TZ850 · Boat battery 12V 100Ah 900A](https://bateriasonline.es/2708-home_default/tudor-tz850.jpg)

> Tudor TZ850: 100 Ah boat battery, 900 A (EN), 353×175×190 mm, positive terminal on the right, L5 case, EFB. Equivalent to Exide EZ850.

**Category:** [Marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries) → [Tudor](https://bateriasonline.es/en/tudor-batteries)

- **Canonical URL**: https://bateriasonline.es/en/tudor-tz850
- **Language**: en
- **Brand**: Tudor
- **Reference**: BOL-TUDOR-TZ850
- **EAN**: 3661024057608
- **MPN**: TZ850
- **Price**: 143,28 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Tudor |
| Range | TUDOR Marina & Leisure Dual EFB |
| Application | Boats |
| Technology | EFB |
| Voltage | 12 V |
| Capacity | 100 Ah |
| Cold cranking amps (EN) | 900 A |
| Length | 353 mm |
| Width | 175 mm |
| Height | 190 mm |
| Weight | 25.5 kg |
| Polarity | Positive terminal on the right |
| Terminal type | EN taper post |
| Case size | L5 (353 × 175 × 190 mm) |

## Quick description

The Tudor TZ850 is a boat battery with 12 V, 100 Ah and 900 A cold cranking current, case size L5 (353 × 175 × 190 mm), with the positive terminal on the right.

## Description

## Who the Tudor TZ850 is for

The Tudor TZ850 is made for marine use. Check whether your boat needs starting, service or a dual-purpose battery before choosing.
The TZ850 belongs to the Tudor TUDOR Marina & Leisure Dual EFB range. [See all Tudor batteries](https://bateriasonline.es/en/tudor-batteries)

## Equivalents and alternatives to the Tudor TZ850

Alternatives to the TZ850 with its dimensions and polarity, in EFB or AGM only: a conventional battery cannot cope with the Start-Stop cycles an EFB is built for.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EZ850 | EFB | 100 Ah | 900 A | 353 × 175 × 190 |
| Varta LED95 | EFB | 95 Ah | 850 A | 353 × 175 × 190 |
| Exide EP800 | AGM | 95 Ah | 850 A | 353 × 175 × 190 |
| Exide EQ800 | AGM | 95 Ah | 850 A | 353 × 175 × 190 |
| Varta LA95 | AGM | 95 Ah | 850 A | 353 × 175 × 190 |

## Tudor TZ850 vs TZ600: which one to choose?

Torn between the TZ850 and another similar Tudor? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Tudor TZ850 (this one) | 100 Ah | 900 A | 353 × 175 × 190 | right | 25.5 kg |
| Tudor TZ600 | 70 Ah | 760 A | 278 × 175 × 190 | right | 19.3 kg |

- Tudor TZ600: 30 Ah less, 140 A less cranking power, a different case (278 × 175 × 190 mm).

## Inside the TZ850: EFB technology

Inside, the TZ850 uses EFB technology, a reinforced version of the flooded battery. The TZ850 works with normal chargers that have a lead-acid or EFB mode.

## Before ordering the TZ850, check this

- Length, width and height of the TZ850: 353 × 175 × 190 mm (European case size L5).
- The TZ850 has the positive terminal on the right: compare it with your current battery.
- Capacity of the TZ850: 100 Ah; the same as your current battery or slightly more is fine.
- Check the EN amps on your battery: if it says 900 A or less, the TZ850 covers your engine.

## Tudor TZ850 codes and part numbers

This is how the Tudor TZ850 appears on the label and in parts catalogues:

| Commercial reference | TZ850 |
|---|---|
| EAN | 3661024057608 |
| Case size (EN) | L5 |
| Terminal type | EN taper post |
| Not to be confused with | Tudor TZ650 (75 Ah, 750 A, positive terminal on the left), Tudor TZ800 (95 Ah, 800 A, positive terminal on the left) |

## Frequently asked questions about the Tudor TZ850

### Tudor TZ850 or TZ600?

Compared with the TZ850, the Tudor TZ600 has 30 Ah less and 140 A less cranking power. The TZ850 cranks harder; the TZ600 is only a good option if your original battery says 760 A or less. Mind the space: the TZ600 measures 278 × 175 × 190 mm.

### How much does the Tudor TZ850 weigh?

The TZ850 weighs 25.5 kg. For reference, the Tudor TZ600 (70 Ah) weighs 19.3 kg.

### Which battery is equivalent to the Tudor TZ850?

In EFB or AGM, with its dimensions and polarity: Exide EZ850, Varta LED95 and Exide EP800. A conventional battery does not replace the TZ850.

### What case size is the Tudor TZ850?

Case size L5: 353 × 175 × 190 mm. The TZ850 fits any standard L5 battery tray such as the Exide EZ850.

### Which side is the positive terminal on the Tudor TZ850?

The TZ850 has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

## Keep comparing: alternatives to the TZ850

- [Other marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries)
- [More Tudor models](https://bateriasonline.es/en/tudor-batteries)
- [Exide EZ850](https://bateriasonline.es/en/exide-ez850) · 100 Ah, 900 A, 353×175×190 mm
- [Varta LED95](https://bateriasonline.es/en/varta-led95) · 95 Ah, 850 A, 353×175×190 mm

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