# Car battery Optima RTU-4.2 12V 50Ah 815A AGM

![Car battery Optima RTU-4.2 12V 50Ah 815A AGM](https://baterias.com/833-home_default/battery-optima-red-top-rtu-42-8004-250-12v-50ah.jpg)

> Optima RTU-4.2 car battery 12V 50Ah 815A AGM. Original, 2-year manufacturer warranty, 24 h delivery. Check compatibility by plate.

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

- **Canonical URL**: https://baterias.com/gb/battery-optima-red-top-rtu-42-8004-250-12v-50ah
- **Language**: en-GB
- **Brand**: OPTIMA
- **Reference**: BCOM-OPTIMA-RTU-4.2
- **EAN**: 4016987113486
- **MPN**: RTU-4.2
- **Price**: 185,15 €
- **Stock**: In stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | OPTIMA |
| Reference | RTU-4.2 |
| Model | OPTIMA RED TOP |
| Voltaje | 12 V |
| Largo | 254 mm |
| Ancho | 172 mm |
| Alto | 173 mm |
| Peso | 18 kg |
| Tecnología | AGM ESPIRAL |
| EAN | 4016987113486 |
| Scheme | 1 |
| Terminal | 1 & 21 |
| Arranque en frío CCA EN | 815 A |
| Capacidad C20 (Ah) | 50 Ah (c20) |
| ETN | 8042500008882 |

## Quick description

**Optima RTU-4.2 12V 50Ah 815A** is a ready-to-use passenger car battery, sealed and maintenance-free. Delivers the cranking amps the engine needs in cold weather and keeps stable voltage for modern car loads (ECU, sensors, climate control, infotainment).

### Why this car battery??

- **Original-equipment quality** without dealership prices
- **Lasts 4 to 6 years** buy once instead of twice
- **Real human tech support** if you have any doubts before buying

🔌 Voltage i
12 V

⚡ Capacity i
50 Ah C20

🔋 Cold cranking i
815 A EN-1

📏 Dimensions i
254×172×173 mm

⚙️ Technology i
AGM

🧭 Polarity i
Positive On The Left

⚖️ Weight i
18 kg

🏷️ Model i
Optima Red Top

## Description

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

## Battery Optima Red Top RTU 4.2 50Ah 815A 12V

The Battery OPTIMA RTU-4.2 50Ah 815A 12V RED TOP belongs to the Optima Redotop batteries range

This high -end battery incorporates Spiracell (cells with spiral structure inside that enhances the performance of the batteries) created by OptimIn those applications where starting power is priority such as trucks, all -terrain vehicles, agricultural and construction machinery, emergency vehicles, generators and trams.

They are batteries that last up to three times more and is up to 15 times more resistant to vibrations than other batteries.It is designed to spill -proof.And offers rapid recharge capacity to recover tension in a short time for short driving cycles.
This battery is incredibly robust.Its power and durability are characteristics in which you can fully trust because it is designed to always offer the maximum starting power and, therefore, a reliable commissioning of the vehicle.

### Ideal for:

- Start applications

- Agricultural machines

- Construction vehicles

- Emergency vehicles

- Generators

- Trams

### Battery advantages and characteristics OPTIMA RTU-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 Red Top RTU 4.2, you can download the product's technical sheet at the following link:
[

Download technical sheet Optima Red Top RTU 4.2 50Ah 815A 12V](/fichastecnicas/data-sheet-battery-optima-rtu-4_2-50ah-815a-12v-en.pdf)

## Reviews

- **Average rating**: 4.9 / 5 (16 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 · 2026-05-24*