# Varta YTR4A-BS · Motorcycle battery 12V 2.3Ah 30A

![Varta YTR4A-BS · Motorcycle battery 12V 2.3Ah 30A](https://bateriasonline.es/1016-home_default/varta-ytr4a-bs-502903003.jpg)

> Varta YTR4A-BS (ETN 502903003): 2.3 Ah motorcycle battery, 30 A (EN), 114×49×86 mm, positive terminal on the right.

**Category:** [Motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries) → [Varta](https://bateriasonline.es/en/varta-batteries)

- **Canonical URL**: https://bateriasonline.es/en/varta-ytr4a-bs-502903003
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-502903003
- **EAN**: 4016987168851
- **MPN**: 502903003
- **Price**: 73,26 € (VAT incl., Spain)
- **Last updated**: 2026-11-09

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA PowerSports AGM |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 2.3 Ah |
| Cold cranking amps (EN) | 30 A |
| Length | 114 mm |
| Width | 49 mm |
| Height | 86 mm |
| Weight | 0.99 kg |
| Polarity | Positive terminal on the right |
| Terminal type | Y12 |
| ETN code | 502903003 |
| JIS code | YTR4 A-BS |

## Quick description

Varta YTR4A-BS (ETN 502 903 003, also written 502903003): motorcycle battery (AGM) with 12 V, 2.3 Ah and 30 A cold cranking current, measuring 114 × 49 × 86 mm, with the positive terminal on the right.

## Description

## Who the Varta YTR4A-BS is for

The Varta YTR4A-BS is made for motorcycles, scooters and quads. It handles frame vibration and idle periods better than an adapted car battery.
At 2.3 Ah it is a small battery, typical of 50 to 125 cc scooters and light motorcycles. In the Varta catalogue, the YTR4A-BS belongs to the Powersports AGM line. [The full range of Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Varta YTR4A-BS codes and part numbers

Shops, garages and catalogues identify the YTR4A-BS with these codes:

| Commercial reference | YTR4A-BS |
|---|---|
| ETN code | 502903003 (also 502 903 003) |
| Manufacturer short code | TR4A-BS |
| EAN | 4016987168851 |
| Base hold-down | B00 |
| Terminal type | Y12 |
| Also known as | Varta 502903003 · Varta 502 903 003 · Varta TR4A-BS |

## Equivalents and alternatives to the Varta YTR4A-BS

As the YTR4A-BS is an AGM battery, we only list other AGM batteries with its dimensions and polarity: neither an EFB nor a conventional battery can replace it.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide ETR4A-BS | AGM | 2 Ah | 35 A | 115 × 50 × 85 |

## Varta YTR4A-BS vs YT4L-BS and YTX4L-4 (FA): differences

The real differences between the YTR4A-BS and the closest Varta models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta YTR4A-BS (this one) | 2.3 Ah | 30 A | 114 × 49 × 86 | right | 0.99 kg |
| Varta YT4L-BS | 3 Ah | 40 A | 114 × 71 × 86 | right | 1.39 kg |
| Varta YTX4L-4 (FA) | 3 Ah | 50 A | 113 × 70 × 87 | right | 1.4 kg |

- Varta YT4L-BS: 0.70 Ah more, 10 A more cranking power, a different case (114 × 71 × 86 mm).
- Varta YTX4L-4 (FA): 0.70 Ah more, 20 A more cranking power, a different case (113 × 70 × 87 mm).

## Before ordering the YTR4A-BS, check this

- Check the EN amps on your battery: if it says 30 A or less, the YTR4A-BS covers your engine.
- Capacity of the YTR4A-BS: 2.3 Ah; the same as your current battery or slightly more is fine.
- The YTR4A-BS has the positive terminal on the right: compare it with your current battery.
- The YTR4A-BS needs 114 × 49 × 86 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Varta YTR4A-BS

### Varta YTR4A-BS or YT4L-BS?

Compared with the YTR4A-BS, the Varta YT4L-BS has 0.70 Ah more and 10 A more cranking power. If your current battery says 40 A or more, choose the YT4L-BS; if it says 30 A or less, the YTR4A-BS is enough. Mind the space: the YT4L-BS measures 114 × 71 × 86 mm.

### Is the Varta 502903003 the same battery as the Varta YTR4A-BS?

Yes. 502903003 is the ETN code Varta uses for its YTR4A-BS battery, so you can search for it by either code.

### How much does the Varta YTR4A-BS weigh?

The YTR4A-BS weighs 0.99 kg. For reference, the Varta YT4L-BS (3 Ah) weighs 1.39 kg.

### Which battery is equivalent to the Varta YTR4A-BS?

Only other AGM batteries with its dimensions and polarity: Exide ETR4A-BS. Neither an EFB nor a conventional battery replaces the YTR4A-BS.

### Which side is the positive terminal on the Varta YTR4A-BS?

The YTR4A-BS has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

### How do I stop the motorcycle battery going flat in winter?

Connect it to a maintenance charger or disconnect it if the bike will sit for more than a month. A flat motorcycle battery sulphates in a few weeks.

## AGM technology in the YTR4A-BS

Inside, the YTR4A-BS has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Other options if you are unsure about the YTR4A-BS

- [More motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [Full Varta catalogue](https://bateriasonline.es/en/varta-batteries)
- [Exide ETR4A-BS](https://bateriasonline.es/en/exide-etr4a-bs) · 2 Ah, 35 A, 115×50×85 mm

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