# Optima batteries

> Over 20 Optima spiral-cell AGM batteries for cars, motorhomes, boats and 6V classic cars, such as YTS-5.5 or BTDC-4.2. 14 days to return it.

**Category:** [Beginning](https://bateriasonline.es/en/) → [Battery brands](https://bateriasonline.es/en/battery-brands)

- **Canonical URL**: https://bateriasonline.es/en/optima-batteries
- **Language**: en

## Description

Optima spiral-cell batteries, highly resistant to vibration, for starting and service use; buy online with VAT included.
**Most searched models:** [Optima RTC-4.2](https://bateriasonline.es/en/optima-rtc-4-2), [Optima YTS-2.7J](https://bateriasonline.es/en/optima-yts-2-7j), [Optima RTU-4.2](https://bateriasonline.es/en/optima-rtu-4-2), [Optima YTS-5.5](https://bateriasonline.es/en/optima-yts-5-5), [Optima BTDC-5.0](https://bateriasonline.es/en/optima-btdc-5-0), [Optima RTR-3.7](https://bateriasonline.es/en/optima-rtr-3-7), [Optima BTSLI-4.2](https://bateriasonline.es/en/optima-btsli-4-2), [Optima RTS-2.1](https://bateriasonline.es/en/optima-rts-2-1), [Optima YTR-2.7J](https://bateriasonline.es/en/optima-ytr-2-7j), [Optima RTS-3.7](https://bateriasonline.es/en/optima-rts-3-7), [Optima BTDC-4.2](https://bateriasonline.es/en/optima-btdc-4-2), [Optima BTDC-5.5](https://bateriasonline.es/en/optima-btdc-5-5).

Every OPTIMA spiral-cell battery in one list: RedTop for starting, dual-purpose YellowTop and marine BlueTop, in 12 V plus two 6 V models for classics, between 38 and 75 Ah.
Filter by range, Ah, cold cranking amps, polarity and dimensions to find the one that fits your vehicle and its battery tray.

## Which colour top do you need?

- **RedTop**: if all you need is starting. Cars, jet skis, race vehicles or classics where the battery mostly works with the alternator charging.
- **YellowTop**: if, besides starting, you run many loads with the engine off or drain the battery deeply. Audio systems, winches, modified 4x4s, motorhomes, or as an **auxiliary battery**.
- **BlueTop**: for boats, where it starts the engine and powers the electronics. Check the terminal type: some versions add threaded posts alongside the automotive ones.

## Figures to compare

First look at the **Ah** and **CCA** of your current battery and choose an OPTIMA that matches or beats them. Then the size: OPTIMA uses its own case, often lower or narrower than a European box battery, and you may need a hold-down adapter. Check the **polarity** (positive on the right or left) and the terminal type. For 6 V vintage cars there is a dedicated RedTop and YellowTop.
If you fit a YellowTop as an auxiliary battery, connect it through a split-charge relay or isolator: the alternator then charges both, and starting never depends on the battery that runs your loads. This is the usual setup in motorhomes and expedition 4x4s.

## Frequently asked questions

### Do I need a special charger for an OPTIMA?

One with an AGM mode and, if the battery is deeply discharged, a recovery function. Our [battery chargers](https://bateriasonline.es/en/battery-chargers) section lists suitable ones.

### Does an OPTIMA have to stand upright?

Yes, as a sealed AGM it accepts many positions, just not upside down.
More about the brand on the [OPTIMA brand page](https://bateriasonline.es/en/optima-batteries). Compare too in [classic car batteries](https://bateriasonline.es/en/classic-car-batteries) and [auxiliary batteries](https://bateriasonline.es/en/auxiliary-backup-batteries).

## Products in this category

| Product | Brand | Price |
|---|---|---|
| [Optima BTDC-4.2 · Boat battery 12V 55Ah 765A](https://bateriasonline.es/en/optima-btdc-4-2) | Optima | 212,24 € |
| [Optima BTDC-5.0 · Boat battery 12V 66Ah 765A](https://bateriasonline.es/en/optima-btdc-5-0) | Optima | 220,86 € |
| [Optima BTDC-5.5 · Boat battery 12V 75Ah 975A](https://bateriasonline.es/en/optima-btdc-5-5) | Optima | 258,10 € |
| [Optima BTSLI-4.2 · Boat battery 12V 50Ah 815A](https://bateriasonline.es/en/optima-btsli-4-2) | Optima | 177,59 € |
| [Optima RTC-4.2 · Car battery 12V 50Ah 815A](https://bateriasonline.es/en/optima-rtc-4-2) | Optima | 181,81 € |
| [Optima RTF-4.2 · Car battery 12V 50Ah 815A](https://bateriasonline.es/en/optima-rtf-4-2) | Optima | 200,57 € |
| [Optima RTR-3.7 · Car battery 12V 44Ah 730A](https://bateriasonline.es/en/optima-rtr-3-7) | Optima | 187,78 € |
| [Optima RTR-4.2 · Car battery 12V 50Ah 815A](https://bateriasonline.es/en/optima-rtr-4-2) | Optima | 205,42 € |
| [Optima RTS-2.1 · Classic car battery 6V 50Ah 815A](https://bateriasonline.es/en/optima-rts-2-1) | Optima | 160,14 € |
| [Optima RTS-3.7 · Car battery 12V 44Ah 730A](https://bateriasonline.es/en/optima-rts-3-7) | Optima | 186,71 € |
| [Optima RTS-4.2 · Car battery 12V 50Ah 815A](https://bateriasonline.es/en/optima-rts-4-2) | Optima | 183,37 € |
| [Optima RTU-3.7 · Car battery 12V 44Ah 730A](https://bateriasonline.es/en/optima-rtu-3-7) | Optima | 183,28 € |
| [Optima RTU-4.2 · Car battery 12V 50Ah 815A](https://bateriasonline.es/en/optima-rtu-4-2) | Optima | 181,81 € |
| [Optima YTR-2.7 · Auxiliary battery 12V 38Ah 460A](https://bateriasonline.es/en/optima-ytr-2-7) | Optima | 209,93 € |
| [Optima YTR-2.7J · Auxiliary battery 12V 38Ah 460A](https://bateriasonline.es/en/optima-ytr-2-7j) | Optima | 203,17 € |

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