# Varta YTX20-BS · Motorcycle battery 12V 18Ah 250A

![Varta YTX20-BS · Motorcycle battery 12V 18Ah 250A](https://bateriasonline.es/1318-home_default/varta-ytx20-bs-518902025.jpg)

> Varta YTX20-BS (ETN 518902025): 18 Ah motorcycle battery, 250 A (EN), 177×88×156 mm, positive terminal on the left.

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

- **Canonical URL**: https://bateriasonline.es/en/varta-ytx20-bs-518902025
- **Language**: en
- **Brand**: Varta
- **Reference**: BOL-VARTA-518902025
- **EAN**: 4016987169513
- **MPN**: 518902025
- **Price**: 110,16 € (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 | 18 Ah |
| Cold cranking amps (EN) | 250 A |
| Length | 177 mm |
| Width | 88 mm |
| Height | 156 mm |
| Weight | 5.96 kg |
| Polarity | Positive terminal on the left |
| Terminal type | Y4 |
| ETN code | 518902025 |
| JIS code | YTX20-4 YTX20-BS |

## Quick description

Varta YTX20-BS (ETN 518 902 025, also written 518902025): motorcycle battery (AGM) with 12 V, 18 Ah and 250 A cold cranking current, measuring 177 × 88 × 156 mm, with the positive terminal on the left. If yours has the positive terminal on the right, you need the Varta YTX20L-BS.

## Description

## The Varta YTX20-BS at a glance

The Varta YTX20-BS is made for motorcycles, scooters and quads. With 18 Ah, the YTX20-BS suits motorcycles and scooters that had a battery of that capacity.
At 18 Ah it goes into large-capacity motorcycles, adventure bikes, customs and quads. In the Varta catalogue, the YTX20-BS belongs to the Powersports AGM line. [See all Varta batteries](https://bateriasonline.es/en/varta-batteries)

## Varta YTX20-BS codes and part numbers

This is how the Varta YTX20-BS appears on the label and in parts catalogues:

| Commercial reference | YTX20-BS |
|---|---|
| ETN code | 518902025 (also 518 902 025) |
| Manufacturer short code | TX20-BS (TX20-4) |
| EAN | 4016987169513 |
| Base hold-down | B00 |
| Terminal type | Y4 |
| Also known as | Varta 518902025 · Varta 518 902 025 · Varta TX20-BS (TX20-4) |
| Not to be confused with | Varta YTX20L-BS (18 Ah, 250 A, positive terminal on the right), Varta YTX20H-BS (18 Ah, 320 A, positive terminal on the right) |

## Equivalents and alternatives to the Varta YTX20-BS

As the YTX20-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 AGM12-19.1 | AGM | 18 Ah | 270 A | 175 × 90 × 155 |
| Exide ETX20H-BS | AGM | 18 Ah | 270 A | 175 × 90 × 155 |
| Fulbat FTX20-BS | AGM | 18.9 Ah | 270 A | 175 × 87 × 155 |

## Varta YTX20-BS vs TX20H (FA), YTX20L-BS and YTX20CH-BS

What sets the YTX20-BS apart from its neighbours in the Varta range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Varta YTX20-BS (this one) | 18 Ah | 250 A | 177 × 88 × 156 | left | 5.96 kg |
| Varta TX20H (FA) | 18 Ah | 310 A | 176 × 89 × 154 | left | 6.55 kg |
| Varta YTX20L-BS | 18 Ah | 250 A | 177 × 88 × 156 | right | 5.96 kg |
| Varta YTX20CH-BS | 18 Ah | 270 A | 150 × 87 × 161 | left | 5.53 kg |

- Varta TX20H (FA): the same capacity, 60 A more cranking power, the same dimensions.
- If the positive terminal of your battery is on the other side, the one you need is the Varta YTX20L-BS (positive terminal on the right).
- Varta YTX20CH-BS: the same capacity, 20 A more cranking power, a different case (150 × 87 × 161 mm).

## What to look at before buying the YTX20-BS

- The YTX20-BS delivers 250 A cold cranking (EN standard); do not go below what your original battery states.
- Your current battery should say about 18 Ah; a little more is also fine.
- The YTX20-BS has the positive terminal on the left: compare it with your current battery.
- The YTX20-BS needs 177 × 88 × 156 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Varta YTX20-BS

### Varta YTX20-BS or TX20H (FA)?

Compared with the YTX20-BS, the Varta TX20H (FA) has 60 A more cranking power. If your current battery says 310 A or more, choose the TX20H (FA); if it says 250 A or less, the YTX20-BS is enough. Both measure 177 × 88 × 156 mm, so they fit the same tray.

### What is the difference between the Varta YTX20-BS and the YTX20L-BS?

They are the same battery with the terminals swapped: positive terminal on the left on the YTX20-BS, positive terminal on the right on the YTX20L-BS. Look at your current battery with the terminals facing you and pick the one that matches. That is why their ETNs only differ in the middle group: 518 902 025 for the YTX20-BS and 518 901 025 for the YTX20L-BS.

### Is the Varta 518902025 the same battery as the Varta YTX20-BS?

Yes. 518902025 is the ETN code Varta uses for its YTX20-BS battery, so you can search for it by either code.

### How much does the Varta YTX20-BS weigh?

The YTX20-BS weighs 5.96 kg. For reference, the Varta TX20H (FA) (18 Ah) weighs 6.55 kg.

### Which battery is equivalent to the Varta YTX20-BS?

Only other AGM batteries with its dimensions and polarity: Exide AGM12-19.1, Exide ETX20H-BS and Fulbat FTX20-BS. Neither an EFB nor a conventional battery replaces the YTX20-BS.

### Which charger does the Varta YTX20-BS 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 YTX20-BS is AGM

Inside, the YTX20-BS has glass fibre separators (AGM) that hold the electrolyte. The YTX20-BS needs a charger with an AGM mode that does not exceed 14.7 V.

## More batteries to compare with the YTX20-BS

- [More motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [The whole Varta range](https://bateriasonline.es/en/varta-batteries)
- [Exide AGM12-19.1](https://bateriasonline.es/en/exide-agm12-19-1) · 18 Ah, 270 A, 175×90×155 mm
- [Exide ETX20H-BS](https://bateriasonline.es/en/exide-etx20h-bs) · 18 Ah, 270 A, 175×90×155 mm

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