# Fulbat FB12A-B · Motorcycle battery 12V 12.6Ah 155A

![Fulbat FB12A-B · Motorcycle battery 12V 12.6Ah 155A](https://bateriasonline.es/429-home_default/fulbat-fb12a-b.jpg)

> Fulbat FB12A-B: 12.6 Ah motorcycle battery, 155 A (EN), 134×80×160 mm, positive terminal on the left. Equivalent to Exide EB12A-A and Varta YB12A-A.

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-fb12a-b
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FB12A-B
- **MPN**: FB12A-B
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Motorcycle DRY |
| Application | Motorcycles |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 12.6 Ah |
| Cold cranking amps (EN) | 155 A |
| Length | 134 mm |
| Width | 80 mm |
| Height | 160 mm |
| Weight | 3.98 kg |
| Polarity | Positive terminal on the left |

## Quick description

The Fulbat FB12A-B is a motorcycle battery with 12 V, 12.6 Ah and 155 A cold cranking current, measuring 134 × 80 × 160 mm, with the positive terminal on the left. If yours has the positive terminal on the right, you need the Fulbat FB12AL-A/A2.

## Description

## Who the Fulbat FB12A-B is for

The Fulbat FB12A-B is made for motorcycles, scooters and quads. It handles frame vibration and idle periods better than an adapted car battery.
At 12.6 Ah it goes into large-capacity motorcycles, adventure bikes, customs and quads. The FB12A-B belongs to the Fulbat FULBAT Motorcycle DRY range. [The full range of Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat FB12A-B

Same dimensions and polarity as the FB12A-B, with similar capacity and cranking power; as a conventional battery, the FB12A-B can also be replaced by an EFB or AGM of the same size if you want more cycles.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Exide EB12A-A | Lead-acid | 12 Ah | 165 A | 135 × 80 × 160 |
| Varta YB12A-A | Lead-acid | 12 Ah | 160 A | 136 × 82 × 161 |
| Varta YB12A-B | Lead-acid | 12 Ah | 160 A | 136 × 82 × 162 |
| Fulbat FB12A-A | Lead-acid | 12.6 Ah | 155 A | 134 × 80 × 160 |
| Motobatt MB12U | AGM | 15 Ah | 160 A | 135 × 80 × 161 |

## Fulbat FB12A-B vs FB14-A2, FB12AL-A/A2 and FB12C-A: differences

How the FB12A-B compares with Fulbat batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat FB12A-B (this one) | 12.6 Ah | 155 A | 134 × 80 × 160 | left | 3.98 kg |
| Fulbat FB14-A2 | 14.7 Ah | 175 A | 134 × 89 × 166 | left | 4.43 kg |
| Fulbat FB12AL-A/A2 | 12.6 Ah | 155 A | 134 × 80 × 160 | right | 3.98 kg |
| Fulbat FB12C-A | 12.6 Ah | 155 A | 134 × 80 × 175 | left | 4.26 kg |
| Fulbat FTX14AH-BS | 12.6 Ah | 210 A | 135 × 90 × 167 | left | 4.47 kg |

- Fulbat FB14-A2: 2.10 Ah more, 20 A more cranking power, a different case (134 × 89 × 166 mm).
- Fulbat FB12AL-A/A2: identical to the FB12A-B except for the positive terminal, which is on the other side (positive terminal on the right).
- Fulbat FB12C-A: the same capacity, the same cranking power, a different height (175 mm instead of 160 mm). It only fits if there is room for 175 mm of height.
- Fulbat FTX14AH-BS: the same capacity, 55 A more cranking power, a different case (135 × 90 × 167 mm), AGM technology.

## Before ordering the FB12A-B, check this

- Check the EN amps on your battery: if it says 155 A or less, the FB12A-B covers your engine.
- With 12.6 Ah, the FB12A-B replaces an original battery of that capacity or slightly less.
- Polarity of the FB12A-B: positive terminal on the left (if yours has it on the other side, the cables will not reach).
- Measure the space: the FB12A-B takes up 134 × 80 × 160 mm.

## Frequently asked questions about the Fulbat FB12A-B

### Fulbat FB12A-B or FB14-A2?

Compared with the FB12A-B, the Fulbat FB14-A2 has 2.10 Ah more and 20 A more cranking power. If your current battery says 175 A or more, choose the FB14-A2; if it says 155 A or less, the FB12A-B is enough. Mind the space: the FB14-A2 measures 134 × 89 × 166 mm.

### What is the difference between the Fulbat FB12A-B and the FB12AL-A/A2?

They are the same battery with the terminals swapped: positive terminal on the left on the FB12A-B, positive terminal on the right on the FB12AL-A/A2. Look at your current battery with the terminals facing you and pick the one that matches.

### Fulbat FB12A-B or FB12C-A: what changes?

Mainly the height: the FB12A-B is 160 mm tall and the Fulbat FB12C-A 175 mm, with the same length and width. In capacity and cranking power, the FB12C-A offers 12.6 Ah and 155 A against 12.6 Ah and 155 A. Before choosing between the FB12A-B and the FB12C-A, measure the free height of the battery compartment with the cover or bonnet closed.

### How much does the Fulbat FB12A-B weigh?

The FB12A-B weighs 3.98 kg. For reference, the Fulbat FB14-A2 (14.7 Ah) weighs 4.43 kg.

### Which battery is equivalent to the Fulbat FB12A-B?

With the same dimensions, polarity and similar capacity you have the Exide EB12A-A, Varta YB12A-A and Varta YB12A-B. As the FB12A-B is a conventional battery, an EFB or AGM of the same size also works.

## What it means that the FB12A-B is lead-acid

Inside, the FB12A-B is classic lead-acid: liquid electrolyte and lead plates. It is a robust, well-known technology with a good capacity-to-price ratio, and still the basis of most cars, trucks and traction equipment.

## More batteries to compare with the FB12A-B

- [More motorcycle batteries](https://bateriasonline.es/en/motorcycle-batteries)
- [More Fulbat models](https://bateriasonline.es/en/fulbat-batteries)
- [Exide 12N12A-4A-1](https://bateriasonline.es/en/exide-12n12a-4a-1) · 12 Ah, 115 A, 135×80×160 mm

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