# Fulbat FT4B-BS · Motorcycle battery 12V 2.4Ah 40A

![Fulbat FT4B-BS · Motorcycle battery 12V 2.4Ah 40A](https://bateriasonline.es/661-home_default/fulbat-ft4b-bs.jpg)

> Fulbat FT4B-BS: 2.4 Ah motorcycle battery, 40 A (EN), 113×38×85 mm, AGM. Equivalent to Motobatt MBT4BB. Price on request: ask for a free quote.

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-ft4b-bs
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FT4B-BS
- **MPN**: FT4B-BS
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Motorcycle MF |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 2.4 Ah |
| Cold cranking amps (EN) | 40 A |
| Length | 113 mm |
| Width | 38 mm |
| Height | 85 mm |
| Weight | 0.98 kg |

## Quick description

Fulbat FT4B-BS: motorcycle battery (AGM) with 12 V, 2.4 Ah and 40 A cold cranking current, measuring 113 × 38 × 85 mm.

## Description

## Where the Fulbat FT4B-BS fits

The Fulbat FT4B-BS is made for motorcycles, scooters and quads. It handles frame vibration and idle periods better than an adapted car battery.
At 2.4 Ah it is a small battery, typical of 50 to 125 cc scooters and light motorcycles. The FT4B-BS belongs to the Fulbat FULBAT Motorcycle MF range. [More Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat FT4B-BS

Other AGM batteries that fit the FT4B-BS's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Motobatt MBT4BB | AGM | 2.5 Ah | 40 A | 113 × 38 × 87 |

## Fulbat FT4B-BS vs FTR4A-BS

What sets the FT4B-BS apart from its neighbours in the Fulbat range:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Weight |
|---|---|---|---|---|
| Fulbat FT4B-BS (this one) | 2.4 Ah | 40 A | 113 × 38 × 85 | 0.98 kg |
| Fulbat FTR4A-BS | 2.4 Ah | 45 A | 113 × 48 × 85 | 1.05 kg |

- Fulbat FTR4A-BS: the same capacity, 5 A more cranking power, a different case (113 × 48 × 85 mm).

## What to look at before buying the FT4B-BS

- Check the EN amps on your battery: if it says 40 A or less, the FT4B-BS covers your engine.
- Capacity of the FT4B-BS: 2.4 Ah; the same as your current battery or slightly more is fine.
- Measure the space: the FT4B-BS takes up 113 × 38 × 85 mm.

## Frequently asked questions about the Fulbat FT4B-BS

### FT4B-BS or FTR4A-BS: which one suits me?

Compared with the FT4B-BS, the Fulbat FTR4A-BS has 5 A more cranking power. If your current battery says 45 A or more, choose the FTR4A-BS; if it says 40 A or less, the FT4B-BS is enough. Mind the space: the FTR4A-BS measures 113 × 48 × 85 mm.

### How much does the Fulbat FT4B-BS weigh?

0.98 kg, with 2.4 Ah of capacity. For reference, the Fulbat FTR4A-BS (2.4 Ah) weighs 1.05 kg.

### Which battery is equivalent to the Fulbat FT4B-BS?

Only other AGM batteries with its dimensions and polarity: Motobatt MBT4BB. Neither an EFB nor a conventional battery replaces the FT4B-BS.

## What it means that the FT4B-BS is AGM

Inside, the FT4B-BS has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Other options if you are unsure about the FT4B-BS

- [More motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [Full Fulbat catalogue](https://bateriasonline.es/en/fulbat-batteries)
- [Motobatt MBT4BB](https://bateriasonline.es/en/motobatt-mbt4bb) · 2.5 Ah, 40 A, 113×38×87 mm

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