# Fulbat FTX5L-BS · Motorcycle battery 12V 4.2Ah 80A

![Fulbat FTX5L-BS · Motorcycle battery 12V 4.2Ah 80A](https://bateriasonline.es/646-home_default/fulbat-ftx5l-bs.jpg)

> Fulbat FTX5L-BS: 4.2 Ah motorcycle battery, 80 A (EN), 113×70×105 mm, positive terminal on the right, AGM. Equivalent to Varta YTX5L-4 (FA) and Varta YTX5L-BS.

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-ftx5l-bs
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FTX5L-BS
- **MPN**: FTX5L-BS
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Motorcycle MF |
| Application | Motorcycles |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 4.2 Ah |
| Cold cranking amps (EN) | 80 A |
| Length | 113 mm |
| Width | 70 mm |
| Height | 105 mm |
| Weight | 1.78 kg |
| Polarity | Positive terminal on the right |

## Quick description

The Fulbat FTX5L-BS is a motorcycle battery (AGM) with 12 V, 4.2 Ah and 80 A cold cranking current, measuring 113 × 70 × 105 mm, with the positive terminal on the right.

## Description

## The Fulbat FTX5L-BS at a glance

The Fulbat FTX5L-BS is a motorcycle starter battery: compact, vibration-resistant and with just the right power to turn the starter motor and feed the electronics. With 4.2 Ah, the FTX5L-BS suits motorcycles and scooters that had a battery of that capacity.
At 4.2 Ah it is a small battery, typical of 50 to 125 cc scooters and light motorcycles. The FTX5L-BS belongs to the Fulbat FULBAT Motorcycle MF range. [See all Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Fulbat FTX5L-BS codes and part numbers

Look for any of these FTX5L-BS codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | FTX5L-BS |
|---|---|
| Not to be confused with | Fulbat FTX7L-BS (6.3 Ah, 100 A) |

## Equivalents and alternatives to the Fulbat FTX5L-BS

As the FTX5L-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) |
|---|---|---|---|---|
| Varta YTX5L-4 (FA) | AGM | 4 Ah | 75 A | 113 × 70 × 105 |
| Varta YTX5L-BS | AGM | 4 Ah | 80 A | 114 × 71 × 106 |

## Fulbat FTX5L-BS vs FTX4L-BS

Torn between the FTX5L-BS and another similar Fulbat? This is what changes:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat FTX5L-BS (this one) | 4.2 Ah | 80 A | 113 × 70 × 105 | right | 1.78 kg |
| Fulbat FTX4L-BS / FTZ5S-BS | 4.2 Ah | 50 A | 113 × 70 × 85 | right | 1.43 kg |

- Fulbat FTX4L-BS / FTZ5S-BS: the same capacity, 30 A less cranking power, a different case (113 × 70 × 85 mm).

## Before ordering the FTX5L-BS, check this

- Length, width and height of the FTX5L-BS: 113 × 70 × 105 mm.
- The FTX5L-BS has the positive terminal on the right: compare it with your current battery.
- With 4.2 Ah, the FTX5L-BS replaces an original battery of that capacity or slightly less.
- Cold cranking: 80 A (EN), equal to or higher than the original.

## Frequently asked questions about the Fulbat FTX5L-BS

### Fulbat FTX5L-BS or FTX4L-BS / FTZ5S-BS?

Compared with the FTX5L-BS, the Fulbat FTX4L-BS / FTZ5S-BS has 30 A less cranking power. The FTX5L-BS cranks harder; the FTX4L-BS / FTZ5S-BS is only a good option if your original battery says 50 A or less. Mind the space: the FTX4L-BS / FTZ5S-BS measures 113 × 70 × 85 mm.

### How much does the Fulbat FTX5L-BS weigh?

The FTX5L-BS weighs 1.78 kg. For reference, the Fulbat FTX4L-BS / FTZ5S-BS (4.2 Ah) weighs 1.43 kg.

### Which battery is equivalent to the Fulbat FTX5L-BS?

Only other AGM batteries with its dimensions and polarity: Varta YTX5L-4 (FA) and Varta YTX5L-BS. Neither an EFB nor a conventional battery replaces the FTX5L-BS.

### Which side is the positive terminal on the Fulbat FTX5L-BS?

The FTX5L-BS has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

### Which charger does the Fulbat FTX5L-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.

## AGM technology in the FTX5L-BS

The FTX5L-BS is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. Being sealed, the FTX5L-BS can be fitted in the boot or under a seat with no risk of spills.

## Other options if you are unsure about the FTX5L-BS

- [All motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [More Fulbat models](https://bateriasonline.es/en/fulbat-batteries)
- [Varta YTX5L-4 (FA)](https://bateriasonline.es/en/varta-ytx5l-4-fa-504909008) · 4 Ah, 75 A, 113×70×105 mm
- [Varta YTX5L-BS](https://bateriasonline.es/en/varta-ytx5l-bs-504012008) · 4 Ah, 80 A, 114×71×106 mm

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