# Fulbat FTX9-BS · Motorcycle battery 12V 8.4Ah 135A

![Fulbat FTX9-BS · Motorcycle battery 12V 8.4Ah 135A](https://bateriasonline.es/656-home_default/fulbat-ftx9-bs.jpg)

> Fulbat FTX9-BS: 8.4 Ah motorcycle battery, 135 A (EN), 150×87×105 mm, positive terminal on the left, AGM. Equivalent to Exide ET12A-BS and Varta YTX9 (FA).

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-ftx9-bs
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FTX9-BS
- **MPN**: FTX9-BS
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Motorcycle MF |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 8.4 Ah |
| Cold cranking amps (EN) | 135 A |
| Length | 150 mm |
| Width | 87 mm |
| Height | 105 mm |
| Weight | 2.99 kg |
| Polarity | Positive terminal on the left |

## Quick description

The Fulbat FTX9-BS is a motorcycle battery (AGM) with 12 V, 8.4 Ah and 135 A cold cranking current, measuring 150 × 87 × 105 mm, with the positive terminal on the left.

## Description

## Who the Fulbat FTX9-BS is for

The Fulbat FTX9-BS is made for motorcycles, scooters and quads. It handles frame vibration and idle periods better than an adapted car battery.
At 8.4 Ah it covers mid-capacity motorcycles, large scooters and light quads. The FTX9-BS belongs to the Fulbat FULBAT Motorcycle MF range. [The full range of Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat FTX9-BS

Other AGM batteries that fit the FTX9-BS's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Varta YTX9 (FA) | AGM | 8 Ah | 135 A | 151 × 87 × 106 |
| Varta YTX9-BS | AGM | 8 Ah | 135 A | 152 × 88 × 106 |
| Varta T12A (FA) | AGM | 10 Ah | 145 A | 150 × 88 × 105 |
| Exide ET12A-BS | AGM | 10 Ah | 130 A | 150 × 90 × 105 |
| Motobatt MBTX9U | AGM | 10.5 Ah | 160 A | 151 × 87 × 105 |
| Varta YT12A-BS | AGM | 11 Ah | 160 A | 150 × 88 × 105 |

## Fulbat FTX9-BS vs FT12A-BS and FTX7A-BS: which one to choose?

Torn between the FTX9-BS and another similar Fulbat? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat FTX9-BS (this one) | 8.4 Ah | 135 A | 150 × 87 × 105 | left | 2.99 kg |
| Fulbat FT12A-BS | 10.5 Ah | 175 A | 150 × 88 × 105 | left | 3.5 kg |
| Fulbat FTX7A-BS | 6.3 Ah | 105 A | 150 × 87 × 93 | left | 2.51 kg |

- Fulbat FT12A-BS: 2.10 Ah more, 40 A more cranking power, the same dimensions.
- Fulbat FTX7A-BS: 2.10 Ah less, 30 A less cranking power, a different case (150 × 87 × 93 mm).

## Check this before ordering the Fulbat FTX9-BS

- Measure the space: the FTX9-BS takes up 150 × 87 × 105 mm.
- The FTX9-BS has the positive terminal on the left: compare it with your current battery.
- With 8.4 Ah, the FTX9-BS replaces an original battery of that capacity or slightly less.
- Cold cranking: 135 A (EN), equal to or higher than the original.

## Frequently asked questions about the Fulbat FTX9-BS

### FTX9-BS or FT12A-BS: which one suits me?

Compared with the FTX9-BS, the Fulbat FT12A-BS has 2.10 Ah more and 40 A more cranking power. If your current battery says 175 A or more, choose the FT12A-BS; if it says 135 A or less, the FTX9-BS is enough. Both measure 150 × 87 × 105 mm, so they fit the same tray.

### How much does the Fulbat FTX9-BS weigh?

2.99 kg, with 8.4 Ah of capacity. For reference, the Fulbat FT12A-BS (10.5 Ah) weighs 3.5 kg.

### Which battery is equivalent to the Fulbat FTX9-BS?

Only other AGM batteries with its dimensions and polarity: Varta YTX9 (FA), Varta YTX9-BS and Varta T12A (FA). Neither an EFB nor a conventional battery replaces the FTX9-BS.

### Which side is the positive terminal on the Fulbat FTX9-BS?

On the FTX9-BS, the positive terminal is on the left with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### Does the Fulbat FTX9-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.

## AGM technology in the FTX9-BS

Inside, the FTX9-BS has glass fibre separators (AGM) that hold the electrolyte. The FTX9-BS needs a charger with an AGM mode that does not exceed 14.7 V.

## Keep comparing: alternatives to the FTX9-BS

- [All motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [More Fulbat models](https://bateriasonline.es/en/fulbat-batteries)
- [Varta YTX9 (FA)](https://bateriasonline.es/en/varta-ytx9-fa-508909014) · 8 Ah, 135 A, 151×87×106 mm
- [Varta YTX9-BS](https://bateriasonline.es/en/varta-ytx9-bs-508012014) · 8 Ah, 135 A, 152×88×106 mm

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