# Fulbat FTX20-BS · Motorcycle battery 12V 18.9Ah 270A

![Fulbat FTX20-BS · Motorcycle battery 12V 18.9Ah 270A](https://bateriasonline.es/639-home_default/fulbat-ftx20-bs.jpg)

> Fulbat FTX20-BS: 18.9 Ah motorcycle battery, 270 A (EN), 175×87×155 mm, positive terminal on the left, AGM. Equivalent to Exide AGM12-19.1 and Exide ETX20H-BS.

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-ftx20-bs
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FTX20-BS
- **MPN**: FTX20-BS
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Motorcycle MF |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 18.9 Ah |
| Cold cranking amps (EN) | 270 A |
| Length | 175 mm |
| Width | 87 mm |
| Height | 155 mm |
| Weight | 5.98 kg |
| Polarity | Positive terminal on the left |

## Quick description

The Fulbat FTX20-BS is a motorcycle battery (AGM) with 12 V, 18.9 Ah and 270 A cold cranking current, measuring 175 × 87 × 155 mm, with the positive terminal on the left. If yours has the positive terminal on the right, you need the Fulbat FTX20L-BS.

## Description

## The Fulbat FTX20-BS at a glance

The Fulbat FTX20-BS is made for motorcycles, scooters and quads. It is worth keeping the FTX20-BS on a maintenance charger if the bike is laid up over winter.
At 18.9 Ah it goes into large-capacity motorcycles, adventure bikes, customs and quads. The FTX20-BS belongs to the Fulbat FULBAT Motorcycle MF range. [The full range of Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Fulbat FTX20-BS codes and part numbers

Shops, garages and catalogues identify the FTX20-BS with these codes:

| Commercial reference | FTX20-BS |
|---|---|
| Not to be confused with | Fulbat FTX20L-BS (18.9 Ah, 270 A, positive terminal on the right), Fulbat FTX20A-BS (18.9 Ah, 270 A) |

## Equivalents and alternatives to the Fulbat FTX20-BS

As the FTX20-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 |
| Motobatt MBTX20U | AGM | 21 Ah | 310 A | 175 × 87 × 155 |
| Motobatt MBTX20UHD | AGM | 21 Ah | 310 A | 175 × 87 × 155 |
| Varta YTX20-BS | AGM | 18 Ah | 250 A | 177 × 88 × 156 |
| Varta TX20H (FA) | AGM | 18 Ah | 310 A | 176 × 89 × 154 |

## Fulbat FTX20-BS vs FTX16-BS, FTX20L-BS and FTX14-BS: differences

How the FTX20-BS compares with Fulbat batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat FTX20-BS (this one) | 18.9 Ah | 270 A | 175 × 87 × 155 | left | 5.98 kg |
| Fulbat FTX16-BS | 14.7 Ah | 230 A | 150 × 87 × 161 | left | 5.17 kg |
| Fulbat FTX20L-BS | 18.9 Ah | 270 A | 175 × 87 × 155 | right | 5.98 kg |
| Fulbat FTX14-BS | 12.6 Ah | 200 A | 150 × 87 × 145 | left | 4.29 kg |

- Fulbat FTX16-BS: 4.20 Ah less, 40 A less cranking power, a different case (150 × 87 × 161 mm).
- The Fulbat FTX20L-BS is the same battery with the positive terminal on the other side: choose it if your current battery has the positive terminal on the right.
- Fulbat FTX14-BS: 6.30 Ah less, 70 A less cranking power, a different case (150 × 87 × 145 mm).

## What to look at before buying the FTX20-BS

- The FTX20-BS needs 175 × 87 × 155 mm of space: measure it with the hold-down clamp in place.
- The FTX20-BS has the positive terminal on the left: compare it with your current battery.
- With 18.9 Ah, the FTX20-BS replaces an original battery of that capacity or slightly less.
- The FTX20-BS delivers 270 A cold cranking (EN standard); do not go below what your original battery states.

## Frequently asked questions about the Fulbat FTX20-BS

### Fulbat FTX20-BS or FTX16-BS?

Compared with the FTX20-BS, the Fulbat FTX16-BS has 4.20 Ah less and 40 A less cranking power. The FTX20-BS cranks harder; the FTX16-BS is only a good option if your original battery says 230 A or less. Mind the space: the FTX16-BS measures 150 × 87 × 161 mm.

### What is the difference between the Fulbat FTX20-BS and the FTX20L-BS?

They are the same battery with the terminals swapped: positive terminal on the left on the FTX20-BS, positive terminal on the right on the FTX20L-BS. Look at your current battery with the terminals facing you and pick the one that matches.

### How much does the Fulbat FTX20-BS weigh?

The FTX20-BS weighs 5.98 kg. For reference, the Fulbat FTX16-BS (14.7 Ah) weighs 5.17 kg.

### Which battery is equivalent to the Fulbat FTX20-BS?

Only other AGM batteries with its dimensions and polarity: Exide AGM12-19.1, Exide ETX20H-BS and Motobatt MBTX20U. Neither an EFB nor a conventional battery replaces the FTX20-BS.

### Does the Fulbat FTX20-BS come charged and ready to fit?

Sealed AGM and gel batteries leave the factory charged and ready. Conventional ones with a separate acid pack are activated when filled and should be charged before fitting.

## Inside the FTX20-BS: AGM technology

Inside, the FTX20-BS has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Keep comparing: alternatives to the FTX20-BS

- [All motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [The whole Fulbat range](https://bateriasonline.es/en/fulbat-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

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*bateriasonline.es — Batteries and accessories · 2026-11-10*