# Varta YB4L-B · Motorcycle battery 12V 4Ah 50A

![Varta YB4L-B · Motorcycle battery 12V 4Ah 50A](https://bateriasonline.es/1038-home_default/varta-yb4l-b-504011005.jpg)

> Varta YB4L-B (ETN 504011005): 4 Ah motorcycle battery, 50 A (EN), 121×71×93 mm, positive terminal on the right. Equivalent to Exide EB4L-B.

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

- **Canonical URL**: https://bateriasonline.es/en/varta-yb4l-b-504011005
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-504011005
- **EAN**: 4016987168905
- **MPN**: 504011005
- **Price**: 96,63 € (VAT incl., Spain)
- **Last updated**: 2026-11-09

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA PowerSports SLI Freshpack |
| Application | Motorcycles |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 4 Ah |
| Cold cranking amps (EN) | 50 A |
| Length | 121 mm |
| Width | 71 mm |
| Height | 93 mm |
| Weight | 1.65 kg |
| Polarity | Positive terminal on the right |
| Terminal type | Y5 |
| ETN code | 504011005 |
| JIS code | YB4 L-B |

## Quick description

Varta YB4L-B (ETN 504 011 005, also written 504011005): motorcycle battery with 12 V, 4 Ah and 50 A cold cranking current, measuring 121 × 71 × 93 mm, with the positive terminal on the right.

## Description

## Where the Varta YB4L-B fits

The Varta YB4L-B is made for motorcycles, scooters and quads. It handles frame vibration and idle periods better than an adapted car battery.
At 4 Ah it is a small battery, typical of 50 to 125 cc scooters and light motorcycles. In the Varta catalogue, the YB4L-B belongs to the Powersports SLI Freshpack line. [The full range of Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Varta YB4L-B codes and part numbers

This is how the Varta YB4L-B appears on the label and in parts catalogues:

| Commercial reference | YB4L-B |
|---|---|
| ETN code | 504011005 (also 504 011 005) |
| Manufacturer short code | B4L-B |
| EAN | 4016987168905 |
| Base hold-down | B00 |
| Terminal type | Y5 |
| Also known as | Varta 504011005 · Varta 504 011 005 · Varta B4L-B |
| Not to be confused with | Varta YB3L-B (3 Ah, 30 A), Varta YB5L-B (5 Ah, 60 A), Varta YB7L-B (7 Ah, 74 A) |

## Equivalents and alternatives to the Varta YB4L-B

Same dimensions and polarity as the YB4L-B, with similar capacity and cranking power; as a conventional battery, the YB4L-B can also be replaced by an EFB or AGM of the same size if you want more cycles.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EB4L-B | Lead-acid | 4 Ah | 50 A | 120 × 70 × 95 |
| Fulbat FB4L-B | Lead-acid | 4.2 Ah | 56 A | 120 × 70 × 92 |

## Varta YB4L-B vs YTX5L-BS and YTX5L-4 (FA): differences

What sets the YB4L-B apart from its neighbours in the Varta range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta YB4L-B (this one) | 4 Ah | 50 A | 121 × 71 × 93 | right | 1.65 kg |
| Varta YTX5L-BS | 4 Ah | 80 A | 114 × 71 × 106 | right | 1.83 kg |
| Varta YTX5L-4 (FA) | 4 Ah | 75 A | 113 × 70 × 105 | right | 1.8 kg |

- Varta YTX5L-BS: the same capacity, 30 A more cranking power, a different case (114 × 71 × 106 mm), AGM technology.
- Varta YTX5L-4 (FA): the same capacity, 25 A more cranking power, a different case (113 × 70 × 105 mm), AGM technology.

## Before ordering the YB4L-B, check this

- Cold cranking: 50 A (EN), equal to or higher than the original.
- Capacity of the YB4L-B: 4 Ah; the same as your current battery or slightly more is fine.
- Polarity of the YB4L-B: positive terminal on the right (if yours has it on the other side, the cables will not reach).
- The YB4L-B needs 121 × 71 × 93 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Varta YB4L-B

### Varta YB4L-B or YTX5L-BS?

Compared with the YB4L-B, the Varta YTX5L-BS has 30 A more cranking power and AGM technology. If your current battery says 80 A or more, choose the YTX5L-BS; if it says 50 A or less, the YB4L-B is enough. Mind the space: the YTX5L-BS measures 114 × 71 × 106 mm.

### Is the Varta 504011005 the same battery as the Varta YB4L-B?

Yes. 504011005 is the ETN code Varta uses for its YB4L-B battery, so you can search for it by either code.

### How much does the Varta YB4L-B weigh?

The YB4L-B weighs 1.65 kg. For reference, the Varta YTX5L-BS (4 Ah) weighs 1.83 kg.

### Which battery is equivalent to the Varta YB4L-B?

With the same dimensions, polarity and similar capacity you have the Exide EB4L-B and Fulbat FB4L-B. As the YB4L-B is a conventional battery, an EFB or AGM of the same size also works.

### Which side is the positive terminal on the Varta YB4L-B?

The YB4L-B 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.

## Lead-acid technology in the YB4L-B

Inside, the YB4L-B is classic lead-acid: liquid electrolyte and lead plates. If the YB4L-B is left discharged for weeks it sulphates: a maintenance charger prevents this.

## Other options if you are unsure about the YB4L-B

- [More motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [The whole Varta range](https://bateriasonline.es/en/varta-batteries)
- [Exide EB4L-B](https://bateriasonline.es/en/exide-eb4l-b) · 4 Ah, 50 A, 120×70×95 mm
- [Fulbat FB4L-B](https://bateriasonline.es/en/fulbat-fb4l-b) · 4.2 Ah, 56 A, 120×70×92 mm

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