# Marine battery Optima BTSLI-4.2 12V 50Ah AGM

![Marine battery Optima BTSLI-4.2 12V 50Ah AGM](https://baterias.com/3808-home_default/battery-optima-blue-top-btsli-42-8006-252-12v-50ah.jpg)

> Optima BTSLI-4.2 marine battery 12V 50Ah AGM. Vibration resistant, deep-discharge capable; cranking and house duties. 24 h delivery.

**Category:** [OPTIMA batteries](https://baterias.com/gb/batteries-optimal) → [OPTIMA](https://baterias.com/gb/optima)

- **Canonical URL**: https://baterias.com/gb/battery-optima-blue-top-btsli-42-8006-252-12v-50ah
- **Language**: en-GB
- **Brand**: OPTIMA
- **Reference**: BCOM-OPTIMA-BTSLI-4.2
- **EAN**: 4016987113493
- **MPN**: BTSLI-4.2
- **Price**: 180,80 €
- **Stock**: Out of stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | OPTIMA |
| Reference | BTSLI-4.2 |
| Model | OPTIMA BLUE TOP |
| Voltaje | 12 V |
| Largo | 254 mm |
| Ancho | 172 mm |
| Alto | 173 mm |
| Peso | 18 kg |
| Tecnología | AGM ESPIRAL |
| EAN | 4016987113493 |
| Scheme | 1 |
| Terminal | 1 & 21 |
| Arranque en frío CCA EN | 815 A |
| Capacidad C20 (Ah) | 50 Ah (c20) |
| ETN | 8062520008882 |

## Quick description

**Optima BTSLI-4.2 12V 50Ah 815A** is a marine battery, vibration resistant and deep-discharge capable.
⚡ Capacity 50 Ah (C20)

🔋 Cold cranking amps (CCA EN) 815 A

🔌 Voltage 12 V

📏 Dimensions (L×W×H) 254×172×173 mm

⚖️ Weight 18 kg

⚙️ Technology AGM

🧭 Polarity positive on the left

🏷️ Line OPTIMA BLUE TOP

## Description

[ ](https://www.optimabatteries.com/en-us)

## Battery Optima BTSLI 4.2 50Ah 815A 12V

The Battery OPTIMA BTSLI-4.2 50Ah 815A 12V BLUE TOP belongs to the Optima Bluetop battery range

This high -end battery incorporates Spiracell technology (cells with spiral structure inside that enhances the performance of the batteries) created by Optima, which offers more prolonged service time, faster recharges and even twiceconventional nautical batteries.

Specially designed to overcome the great demands of nautical applications offering a reliable energy supply, totally free of leaks and does not require maintenance.Totally free of leaks and does not require maintenance.
Among our Bluetop products catalog you will find double -use batteries that S can use in any deep cycle application (navigation accessory, on -board applications, outboard engine, bow propuls) or starting.

### Ideal for:

- Start applications

- Agricultural machines

- Construction vehicles

- Emergency vehicles

- Generators

- Trams

### Battery advantages and characteristics OPTIMA BTSLI-4.2 50Ah 815A 12V

- Long useful life.Lasts up to three times more than conventional flat plates batteries

- Constant performance

- Greater power.More power during the first one, two, five and ten seconds of the starting process compared to similar lead-acid batteries.

- Perfect for seasonal uses.If it is fully charged, it may not be used for a period of up to 12 months at room temperature (or lower) and yet start a car.

- x15 times more resistant to vibrations than standard lead-acid batteries

- Free of mantenimient

- It can be installed almost in any position

### How to find the right battery for your vehicle or device?

Optimal AGM AGM batteries are not comparable to any other battery in the world.Its Spi-Dpiell technology is among the most advanced lead-acid battery technologies available in the market.

If you are not sure what cover color is better under your hood, do not hesitate to contact us and we will be happy to advise you.

### Why choose an optimal battery?

If you look for the maximum possible power or a battery to work in the toughest working conditions.Do not hesitate, choose an optima battery

### OPTIMA - LEADING BRAND IN THE SECTOR

With a 40 -year history of technological innovation and engineering, Optima® products offer unstoppable power for extreme enthusiasts and other people who require the final source of energy.

In the 1970s, Optima Batteries presented the first main maintenanceless lead batteries for commercial and military use and the first high-performance AGM automotive batteries, but optimal innovation did not stop there.Optima the industry revolutionized with the introduction of its exclusive Spiord Technology® that grants certain key benefits such as:
- Incredibly high starter characteristics in a small battery
- Up to 15 times more resistance to vibrations than a conventional battery
- Have a higher life cycle compared to traditional batteries

If you want additional information about Battery Optima BTSLI 4.2, you can download the product's technical sheet at the following link:
[ Download technical sheet Optima BTSLI 4.2 50Ah 815A 12V](/fichastecnicas/data-sheet-battery-optima-btsli-4_2-50ah-815a-12v-en.pdf)

## Reviews

- **Average rating**: 4.8 / 5 (13 reviews)

## 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 · 2026-05-20*