# Fulbat 12N18-4A · Lawn mower battery 12V 18.9Ah 170A

![Fulbat 12N18-4A · Lawn mower battery 12V 18.9Ah 170A](https://bateriasonline.es/485-home_default/fulbat-12n18-4a.jpg)

> Fulbat 12N18-4A: 18.9 Ah lawn mower battery, 170 A (EN), 205×90×162 mm, positive terminal on the left. Ask for a no-obligation quote.

**Category:** [Lawn mower and garden machinery batteries](https://bateriasonline.es/en/lawn-mower-garden-batteries) → [Fulbat](https://bateriasonline.es/en/fulbat-batteries)

- **Canonical URL**: https://bateriasonline.es/en/fulbat-12n18-4a
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-12N18-4A
- **MPN**: 12N18-4A
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Lawn & Garden DRY |
| Application | Lawn mowers and garden machinery |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 18.9 Ah |
| Cold cranking amps (EN) | 170 A |
| Length | 205 mm |
| Width | 90 mm |
| Height | 162 mm |
| Weight | 5.95 kg |
| Polarity | Positive terminal on the left |

## Quick description

Fulbat 12N18-4A: lawn mower battery with 12 V, 18.9 Ah and 170 A cold cranking current, measuring 205 × 90 × 162 mm, with the positive terminal on the left.

## Description

## The Fulbat 12N18-4A at a glance

The Fulbat 12N18-4A is a starter battery for ride-on mowers and garden machinery: small, 12 V and with enough cranking power for single-cylinder engines. Check polarity and terminal type: garden machinery uses several formats.
The 12N18-4A belongs to the Fulbat FULBAT Lawn & Garden DRY range. [More Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat 12N18-4A

We have no other battery with exactly the dimensions and polarity of the 12N18-4A. Browse the rest of our [lawn mower and garden machinery batteries](https://bateriasonline.es/en/lawn-mower-garden-batteries) to compare close options.

## Fulbat 12N18-4A vs 12N24-4A and U1-9: which one to choose?

The real differences between the 12N18-4A and the closest Fulbat models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat 12N18-4A (this one) | 18.9 Ah | 170 A | 205 × 90 × 162 | left | 5.95 kg |
| Fulbat 12N24-4A | 25.3 Ah | 220 A | 184 × 124 × 175 | left | 7.29 kg |
| Fulbat U1-9 | 25.3 Ah | 240 A | 195 × 130 × 180 | left | 7.88 kg |

- Fulbat 12N24-4A: 6.40 Ah more, 50 A more cranking power, a different case (184 × 124 × 175 mm).
- Fulbat U1-9: 6.40 Ah more, 70 A more cranking power, a different case (195 × 130 × 180 mm).

## Lead-acid technology in the 12N18-4A

The 12N18-4A is a conventional lead-acid battery, with plates immersed in liquid electrolyte. Avoid leaving them discharged, as they sulphate, and charge them with a charger that cuts off or switches to maintenance when finished.

## What to look at before buying the 12N18-4A

- Length, width and height of the 12N18-4A: 205 × 90 × 162 mm.
- The 12N18-4A has the positive terminal on the left: compare it with your current battery.
- Your current battery should say about 18.9 Ah; a little more is also fine.
- Cold cranking: 170 A (EN), equal to or higher than the original.

## Part numbers and codes for the Fulbat 12N18-4A

The 12N18-4A is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | 12N18-4A |
|---|---|
| Not to be confused with | Fulbat 12N14-4A (14.7 Ah, 125 A) |

## Frequently asked questions about the Fulbat 12N18-4A

### 12N18-4A or 12N24-4A: which one suits me?

Compared with the 12N18-4A, the Fulbat 12N24-4A has 6.40 Ah more and 50 A more cranking power. If your current battery says 220 A or more, choose the 12N24-4A; if it says 170 A or less, the 12N18-4A is enough. Mind the space: the 12N24-4A measures 184 × 124 × 175 mm.

### How much does the Fulbat 12N18-4A weigh?

5.95 kg, with 18.9 Ah of capacity. For reference, the Fulbat 12N24-4A (25.3 Ah) weighs 7.29 kg.

### Which side is the positive terminal on the Fulbat 12N18-4A?

On the 12N18-4A, 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.

### Why is the mower battery dead every spring?

Because it spends the winter discharging. Charge it before storing the machine and give it a maintenance charge every two months, or disconnect it.

## Other options if you are unsure about the 12N18-4A

- [Other lawn mower and garden machinery batteries](https://bateriasonline.es/en/lawn-mower-garden-batteries)
- [The whole Fulbat range](https://bateriasonline.es/en/fulbat-batteries)

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