# Optima YTR-3.7 · Motorhome battery 12V 48Ah 660A

![Optima YTR-3.7 · Motorhome battery 12V 48Ah 660A](https://bateriasonline.es/3882-home_default/optima-ytr-3-7.jpg)

> Optima YTR-3.7 (ETN 840222000): 48 Ah motorhome battery, 660 A (EN), 237×172×197 mm, positive terminal on the right, spiral AGM.

**Category:** [Leisure batteries for motorhomes and caravans](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan) → [Optima](https://bateriasonline.es/en/optima-batteries)

- **Canonical URL**: https://bateriasonline.es/en/optima-ytr-3-7
- **Language**: en
- **Brand**: Optima
- **Reference**: BOL-OPTIMA-YTR-3.7
- **EAN**: 4016987114667
- **MPN**: YTR-3.7
- **Price**: 199,45 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Optima |
| Range | OPTIMA YELLOW TOP |
| Application | Motorhomes and caravans |
| Technology | Spiral AGM |
| Voltage | 12 V |
| Capacity | 48 Ah |
| Cold cranking amps (EN) | 660 A |
| Length | 237 mm |
| Width | 172 mm |
| Height | 197 mm |
| Weight | 17.6 kg |
| Polarity | Positive terminal on the right |
| ETN code | 840222000 |

## Quick description

The Optima YTR-3.7 (ETN 840 222 000, also written 840222000) is a motorhome battery with 12 V, 48 Ah and 660 A cold cranking current, measuring 237 × 172 × 197 mm, with the positive terminal on the right.

## Description

## The Optima YTR-3.7 at a glance

The Optima YTR-3.7 is made for the living area of a motorhome. Unlike the starter battery, it takes slow, deep discharges night after night.
The YTR-3.7 belongs to the Optima OPTIMA YELLOW TOP range. [See all Optima batteries](https://bateriasonline.es/en/optima-batteries)

## Inside the YTR-3.7: spiral AGM technology

Inside, the YTR-3.7 rolls its plates into cylindrical cells (spiral AGM). It is the basis of OPTIMA batteries.

## Equivalents and alternatives to the Optima YTR-3.7

No other reference in the catalogue fully matches the dimensions and polarity of the YTR-3.7; you will find the closest ones among our [leisure batteries for motorhomes and caravans](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan).

## Optima YTR-3.7 codes and part numbers

This is how the Optima YTR-3.7 appears on the label and in parts catalogues:

| Commercial reference | YTR-3.7 |
|---|---|
| ETN code | 840222000 (also 840 222 000) |
| EAN | 4016987114667 |
| Case size according to Optima | 35 (BCI) |
| Base hold-down | B3 |
| Also known as | Optima 840222000 · Optima 840 222 000 |
| Not to be confused with | Optima RTR-3.7 (44 Ah, 730 A), Optima YTR-2.7 (38 Ah, 460 A) |

## Check this before ordering the Optima YTR-3.7

- The YTR-3.7 delivers 660 A cold cranking (EN standard); do not go below what your original battery states.
- Capacity of the YTR-3.7: 48 Ah; the same as your current battery or slightly more is fine.
- The YTR-3.7 has the positive terminal on the right: compare it with your current battery.
- The YTR-3.7 needs 237 × 172 × 197 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Optima YTR-3.7

### What is the ETN code of the Optima YTR-3.7?

840222000, also written 840 222 000. The ETN (European Type Number) is printed on the label and used in parts catalogues.

### How much does the Optima YTR-3.7 weigh?

The YTR-3.7 weighs 17.6 kg.

### What is the cold cranking current of the Optima YTR-3.7?

660 A to the EN standard, with 48 Ah capacity.

### Which side is the positive terminal on the Optima YTR-3.7?

The YTR-3.7 has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

## Other options if you are unsure about the YTR-3.7

- [All leisure batteries for motorhomes and caravans](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan)
- [More Optima models](https://bateriasonline.es/en/optima-batteries)
- [Optima YTU-4.2](https://bateriasonline.es/en/optima-ytu-4-2) · 55 Ah, 765 A, 254×175×200 mm

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