# Exide EM900 · Boat battery 12V 42Ah 700A

![Exide EM900 · Boat battery 12V 42Ah 700A](https://bateriasonline.es/266-home_default/exide-em900.jpg)

> Exide EM900: 42 Ah boat battery, 700 A (EN), 230×173×206 mm, AGM. Compare sizes and equivalents; 14-day returns.

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

- **Canonical URL**: https://bateriasonline.es/en/exide-em900
- **Language**: en
- **Brand**: Exide
- **Reference**: BOL-EXIDE-EM900
- **EAN**: 3661024036030
- **MPN**: EM900
- **Price**: 509,55 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Exide |
| Range | EXIDE MARINA START AGM |
| Application | Boats |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 42 Ah |
| Cold cranking amps (EN) | 700 A |
| Length | 230 mm |
| Width | 173 mm |
| Height | 206 mm |
| Weight | 15.8 kg |
| Terminal layout | 1+9 |
| Terminal type | SAE M 3/8"- 5/16"&stud |

## Quick description

Exide EM900: boat battery with 12 V, 42 Ah and 700 A cold cranking current, measuring 230 × 173 × 206 mm.

## Description

## The Exide EM900 at a glance

The Exide EM900 is a battery for boats: engine starting or on-board service, depending on its design, with resistance to damp and hull vibration. Fit the EM900 securely on board and away from bilge water.
The EM900 belongs to the Exide EXIDE MARINA START AGM range. [The full range of Exide batteries](https://bateriasonline.es/en/exide-batteries)

## Equivalents and alternatives to the Exide EM900

We have no other battery with exactly the dimensions and polarity of the EM900. Browse the rest of our [marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries) to compare close options.

## Exide EM900 vs EM1000 and EP450

The real differences between the EM900 and the closest Exide models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Weight |
|---|---|---|---|---|
| Exide EM900 (this one) | 42 Ah | 700 A | 230 × 173 × 206 | 15.8 kg |
| Exide EM1000 | 50 Ah | 800 A | 260 × 173 × 206 | 17.9 kg |
| Exide EP450 | 50 Ah | 750 A | 260 × 173 × 206 | 18.6 kg |

- Exide EM1000: 8 Ah more, 100 A more cranking power, a different case (260 × 173 × 206 mm).
- Exide EP450: 8 Ah more, 50 A more cranking power, a different case (260 × 173 × 206 mm).

## Inside the EM900: AGM technology

The EM900 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the EM900 can be fitted in the boot or under a seat with no risk of spills.

## Check this before ordering the Exide EM900

- Length, width and height of the EM900: 230 × 173 × 206 mm.
- With 42 Ah, the EM900 replaces an original battery of that capacity or slightly less.
- The EM900 delivers 700 A cold cranking (EN standard); do not go below what your original battery states.

## Part numbers and codes for the Exide EM900

Look for any of these EM900 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | EM900 |
|---|---|
| EAN | 3661024036030 |
| Terminal type | SAE M 3/8"- 5/16"&stud |
| Not to be confused with | Exide EA900 (90 Ah, 720 A, positive terminal on the right), Exide EC900 (90 Ah, 720 A, positive terminal on the right), Exide ES900 (80 Ah, 540 A, positive terminal on the right) |

## Frequently asked questions about the Exide EM900

### EM900 or EM1000: which one suits me?

Compared with the EM900, the Exide EM1000 has 8 Ah more and 100 A more cranking power. If your current battery says 800 A or more, choose the EM1000; if it says 700 A or less, the EM900 is enough. Mind the space: the EM1000 measures 260 × 173 × 206 mm.

### How much does the Exide EM900 weigh?

15.8 kg, with 42 Ah of capacity. For reference, the Exide EM1000 (50 Ah) weighs 17.9 kg.

### Can the Exide EM900 be used for starting and service at the same time?

Only if it is dual purpose. A starter battery is not built for deep discharge, and a service battery does not deliver the current peak the engine asks for.

## Other options if you are unsure about the EM900

- [All marine and boat batteries](https://bateriasonline.es/en/marine-boat-batteries)
- [More Exide models](https://bateriasonline.es/en/exide-batteries)

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