# Varta YTX4L-4 (FA) · Motorcycle battery 12V 3Ah 50A

![Varta YTX4L-4 (FA) · Motorcycle battery 12V 3Ah 50A](https://bateriasonline.es/1026-home_default/varta-ytx4l-4-fa-503909005.jpg)

> Varta YTX4L-4 (FA) (ETN 503909005): 3 Ah motorcycle battery, 50 A (EN), 113×70×87 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-ytx4l-4-fa-503909005
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-503909005
- **EAN**: 4016987168899
- **MPN**: 503909005
- **Price**: 32,93 € (VAT incl., Spain)
- **Last updated**: 2026-11-09

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Varta |
| Range | VARTA PowerSports AGM Active |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 3 Ah |
| Cold cranking amps (EN) | 50 A |
| Length | 113 mm |
| Width | 70 mm |
| Height | 87 mm |
| Weight | 1.4 kg |
| Polarity | Positive terminal on the right |
| Terminal type | Y4 |
| ETN code | 503909005 |
| JIS code | YTX4 L-4 |

## Quick description

The Varta YTX4L-4 (FA) (ETN 503 909 005, also written 503909005) is a motorcycle battery (AGM) with 12 V, 3 Ah and 50 A cold cranking current, measuring 113 × 70 × 87 mm, with the positive terminal on the right.

## Description

## Where the Varta YTX4L-4 (FA) fits

The Varta YTX4L-4 (FA) is a motorcycle starter battery: compact, vibration-resistant and with just the right power to turn the starter motor and feed the electronics. It is worth keeping the YTX4L-4 (FA) on a maintenance charger if the bike is laid up over winter.
At 3 Ah it is a small battery, typical of 50 to 125 cc scooters and light motorcycles. Varta lists the YTX4L-4 (FA) in its Powersports AGM Active line. [See all Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Part numbers and codes for the Varta YTX4L-4 (FA)

Look for any of these YTX4L-4 (FA) codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | YTX4L-4 (FA) |
|---|---|
| ETN code | 503909005 (also 503 909 005) |
| Manufacturer short code | TX4L (FA) |
| EAN | 4016987168899 |
| Base hold-down | B00 |
| Terminal type | Y4 |
| Also known as | Varta 503909005 · Varta 503 909 005 · Varta TX4L (FA) |
| Not to be confused with | Varta YTX5L-4 (FA) (4 Ah, 75 A) |

## Equivalents and alternatives to the Varta YTX4L-4 (FA)

Other AGM batteries that fit the YTX4L-4 (FA)'s tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide AGM12-4 | AGM | 3 Ah | 50 A | 115 × 70 × 85 |
| Exide ETX4L-BS | AGM | 3 Ah | 50 A | 115 × 70 × 85 |
| Fulbat FTX4L-BS / FTZ5S-BS | AGM | 4.2 Ah | 50 A | 113 × 70 × 85 |

## Varta YTX4L-4 (FA) vs YT4L-BS and YTX5L-4 (FA): which one to choose?

How the YTX4L-4 (FA) compares with Varta batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta YTX4L-4 (FA) (this one) | 3 Ah | 50 A | 113 × 70 × 87 | right | 1.4 kg |
| Varta YT4L-BS | 3 Ah | 40 A | 114 × 71 × 86 | right | 1.39 kg |
| Varta YTX5L-4 (FA) | 4 Ah | 75 A | 113 × 70 × 105 | right | 1.8 kg |

- Varta YT4L-BS: the same capacity, 10 A less cranking power, the same dimensions.
- Varta YTX5L-4 (FA): 1 Ah more, 25 A more cranking power, a different case (113 × 70 × 105 mm).

## Check this before ordering the Varta YTX4L-4 (FA)

- The YTX4L-4 (FA) needs 113 × 70 × 87 mm of space: measure it with the hold-down clamp in place.
- The YTX4L-4 (FA) has the positive terminal on the right: compare it with your current battery.
- With 3 Ah, the YTX4L-4 (FA) replaces an original battery of that capacity or slightly less.
- Cold cranking: 50 A (EN), equal to or higher than the original.

## Frequently asked questions about the Varta YTX4L-4 (FA)

### YTX4L-4 (FA) or YT4L-BS: which one suits me?

Compared with the YTX4L-4 (FA), the Varta YT4L-BS has 10 A less cranking power. The YTX4L-4 (FA) cranks harder; the YT4L-BS is only a good option if your original battery says 40 A or less. Both measure 113 × 70 × 87 mm, so they fit the same tray.

### Is the Varta 503909005 the same battery as the Varta YTX4L-4 (FA)?

Yes. 503909005 is the ETN code Varta uses for its YTX4L-4 (FA) battery, so you can search for it by either code.

### How much does the Varta YTX4L-4 (FA) weigh?

1.4 kg, with 3 Ah of capacity. For reference, the Varta YT4L-BS (3 Ah) weighs 1.39 kg.

### Which battery is equivalent to the Varta YTX4L-4 (FA)?

Only other AGM batteries with its dimensions and polarity: Exide AGM12-4, Exide ETX4L-BS and Fulbat FTX4L-BS / FTZ5S-BS. Neither an EFB nor a conventional battery replaces the YTX4L-4 (FA).

### Which side is the positive terminal on the Varta YTX4L-4 (FA)?

On the YTX4L-4 (FA), the positive terminal is on the right with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### Which charger does the Varta YTX4L-4 (FA) need?

A charger with an AGM mode that limits voltage to about 14.4-14.7 V. Never an old unregulated charger: overcharging dries out an AGM beyond repair.

## What it means that the YTX4L-4 (FA) is AGM

The YTX4L-4 (FA) is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the YTX4L-4 (FA) can be fitted in the boot or under a seat with no risk of spills.

## Keep comparing: alternatives to the YTX4L-4 (FA)

- [All motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [More Varta models](https://bateriasonline.es/en/varta-batteries)
- [Exide AGM12-4](https://bateriasonline.es/en/exide-agm12-4) · 3 Ah, 50 A, 115×70×85 mm
- [Exide ETX4L-BS](https://bateriasonline.es/en/exide-etx4l-bs) · 3 Ah, 50 A, 115×70×85 mm

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