# Caravan battery Optima YTR-3.7 Yellow Top 12V 48Ah 660A AGM

![Caravan battery Optima YTR-3.7 Yellow Top 12V 48Ah 660A AGM](https://baterias.com/830-home_default/battery-optima-yellow-top-ytr-37-8040-222-12v-48ah.jpg)

> Optima YTR-3.7 caravan battery 12V 48Ah 660A AGM. YELLOW TOP range. Dimensions 237×172×197 mm, + terminal on the right. For your on-board services.

**Category:** [Batteries for Caravans](https://baterias.com/gb/batteries-for-caravans) → [OPTIMA](https://baterias.com/gb/optima)

- **Canonical URL**: https://baterias.com/gb/battery-optima-yellow-top-ytr-37-8040-222-12v-48ah
- **Language**: en-GB
- **Brand**: OPTIMA
- **Reference**: BCOM-OPTIMA-YTR-3.7
- **EAN**: 4016987114667
- **MPN**: YTR-3.7
- **Price**: 203,80 € (VAT incl., Spain)
- **Last updated**: 2026-10-28
- **Stock**: Out of stock

## Technical specifications

| Feature | Value |
|---|---|
| Brand | OPTIMA |
| Reference | YTR-3.7 |
| Model | OPTIMA YELLOW TOP |
| Voltage (V) | 12 V |
| Largo | 237 mm |
| Ancho | 172 mm |
| Alto | 168 mm |
| Peso | 17 kg |
| Tecnología | AGM ESPIRAL |
| EAN | 4016987114667 |
| Terminal layout | Positive terminal on the right |
| Terminal type | 1 |
| Hold down | B1 |
| Cold cranking amps (EN) | 660 A |
| Capacity (C20) | 48 Ah (c20) |
| Capacity (C5) | 44 Ah (c5) |
| ETN | 8402220008882 |

## Quick description

**Optima YTR-3.7 12V 48Ah 660A** is a leisure battery for campers, motorhomes and caravans. Designed to power the entire interior kit (fridge, heater, water pump, USB, LED lighting) for several days off-grid, with no need to plug into a campsite hookup.

## Why this caravan battery?

- **Real off-grid autonomy** no campsite hookup needed
- **Lasts the whole season** handles daily discharges without capacity loss
- **Powers it all at once** fridge, water pump, LED and USB without issues

🔌 Voltage
12 V

⚡ Capacity
48 Ah C20

🔋 Cold cranking
660 A EN-1

📏 Dimensions
237×172×197 mm

⚙️ Technology
AGM ESPIRAL

🧭 Polarity
Positive on the right

⚖️ Weight
17,6 kg

🏷️ Model
OPTIMA YELLOW TOP

## Description

## Leisure battery Optima YTR-3.7 Yellow Top 48Ah 660A 12V

12*V* Voltage
48*Ah* Capacity
660*A* Cold cranking
17*kg* Weight

The **Optima YTR-3.7** with spiral-cell AGM technology stores **48 Ah** at **12 V**: autonomy for motorhomes, caravans and campers that need power off-grid. Its 237 × 172 × 168 mm and the positive terminal on the right make it the exact replacement for the 48 Ah battery fitted as standard to many motorhomes and caravans.
- Direct replacement for the original leisure battery.
- Recharges from the alternator, a solar panel or a mains charger.
- Withstands daily discharges throughout the season.
- Spiral AGM construction, sealed and mountable in any position.

### What the Optima YTR-3.7 is for

With 48 Ah, the Optima YTR-3.7 is the habitation battery for motorhomes, caravans and campers that need power off-grid. It recharges from the alternator, a solar panel or a mains charger. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 17 kg, 1 terminals and B1 hold-down.

### Will it fit your current battery tray?

In terms of format, the Optima YTR-3.7 measures 237 × 172 × 168 mm (length × width × height) and weighs 17 kg. The positive terminal on the right decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses a B1 hold-down and 1 terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.

### What Optima does differently

The Optima Red, Yellow and Blue Top are references for high-performance starting, deep cycling and marine use respectively, all with the characteristic six spiral-cell design. All the Optima batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.

### The Optima YTR-3.7: Yellow Top range and spiral-cell AGM technology

The YTR-3.7 is part of the Optima **Yellow Top** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family.
In a spiral-cell battery the electrolyte is absorbed and the plates are wound under pressure. That lets it deliver very high current peaks, recharge quickly and be mounted in any position.

### Care and maintenance

Avoid routinely discharging the leisure battery below 50% and recharge it fully after every trip. During months of storage, keep it charged with a mains charger or a small solar panel; a battery left discharged for weeks loses capacity permanently.

### Official warranty

The Optima YTR-3.7 comes with the **manufacturer's official warranty** against manufacturing defects. Avoid repeated full discharges: they shorten its life and are not covered.

### Delivery times and returns

Order **before 6:00 pm** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **14 days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email.

## Frequently asked questions

### Is the Optima YTR-3.7 an AGM battery and what are the benefits of AGM?

Yes, it is AGM. In an AGM battery such as the YTR-3.7, the electrolyte is not free but absorbed in a glass-fibre mat inside a sealed lead-acid battery. It withstands more cycles than a conventional battery and copes better with heat.

### How much energy does this battery give a caravan?

It stores about 576 Wh. To make it last, it should not be discharged below half, so you have about 288 Wh usable: for example, an average load of 50 W for about 6 hours.

### Can it be charged with solar panels?

Yes, with a charge controller (PWM or MPPT) set for AGM. It can also be charged by the vehicle alternator (ideally with a DC-DC charger) and by the 230 V charger when you are on hook-up at the campsite.

### What size is this battery?

Measure your caravan's battery tray first; if the battery exceeds it by even a millimetre, the hold-down clamp may not close. Length × width × height: 237x172x197 mm. Height is measured to the top of the terminals. Hold-down: B1.

### On which side is the positive of the YTR-3.7 model?

On the Optima YTR-3.7, the polarity is positive on the right. It must match your current battery: reversed polarity means lengthening cables or reconfiguring the system, with a risk of short circuit. To check, stand the battery in front of you with the terminals nearest you: the positive (+) is the one with the red ring.

### What ETN and EAN codes does the Optima YTR-3.7 battery have?

Three codes identify this Optima: MPN YTR-3.7, ETN 8402220008882 (short form 840 222 000, the European parts-catalogue identifier) and EAN-13 4016987114667. It belongs to the OPTIMA YELLOW TOP range. Use them when asking for a quote or comparing prices.


## Technical team (editorial authorship)

The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2012.

→ https://baterias.com/gb/technical-team

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*baterias.com — Automotive batteries · 2026-11-12*