# Fulbat SLA12-18 · Lawn mower battery 12V 18.9Ah 150A

![Fulbat SLA12-18 · Lawn mower battery 12V 18.9Ah 150A](https://bateriasonline.es/565-home_default/fulbat-sla12-18.jpg)

> Fulbat SLA12-18: 18.9 Ah lawn mower battery, 150 A (EN), 182×77×168 mm, positive terminal on the right, AGM. Equivalent to Fulbat SLA12-20.

**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-sla12-18
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-SLA12-18
- **MPN**: SLA12-18
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT Lawn & Garden SLA |
| Application | Lawn mowers and garden machinery |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 18.9 Ah |
| Cold cranking amps (EN) | 150 A |
| Length | 182 mm |
| Width | 77 mm |
| Height | 168 mm |
| Weight | 4.95 kg |
| Polarity | Positive terminal on the right |

## Quick description

Fulbat SLA12-18: lawn mower battery with 12 V, 18.9 Ah and 150 A cold cranking current, measuring 182 × 77 × 168 mm, with the positive terminal on the right.

## Description

## Where the Fulbat SLA12-18 fits

The Fulbat SLA12-18 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 SLA12-18 belongs to the Fulbat FULBAT Lawn & Garden SLA range. [See all Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## AGM technology in the SLA12-18

The SLA12-18 is AGM: the electrolyte is absorbed in glass fibre mats, so it is sealed and spill-proof. It withstands many more cycles than a conventional lead battery, at the cost of being more sensitive to overcharging.

## Fulbat SLA12-18 vs SLA12-20 and SLA12-22: which one to choose?

The real differences between the SLA12-18 and the closest Fulbat models:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat SLA12-18 (this one) | 18.9 Ah | 150 A | 182 × 77 × 168 | right | 4.95 kg |
| Fulbat SLA12-20 | 21.1 Ah | 180 A | 182 × 77 × 168 | right | 5.3 kg |
| Fulbat SLA12-22 | 23.1 Ah | 210 A | 182 × 77 × 168 | right | 6.3 kg |

- Fulbat SLA12-20: 2.20 Ah more, 30 A more cranking power, the same dimensions.
- Fulbat SLA12-22: 4.20 Ah more, 60 A more cranking power, the same dimensions.

## Equivalents and alternatives to the Fulbat SLA12-18

Other AGM batteries that fit the SLA12-18's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Cold cranking (EN) | Dimensions (mm) |
|---|---|---|---|---|
| Fulbat SLA12-20 | AGM | 21.1 Ah | 180 A | 182 × 77 × 168 |

## What to look at before buying the SLA12-18

- Check the EN amps on your battery: if it says 150 A or less, the SLA12-18 covers your engine.
- Capacity of the SLA12-18: 18.9 Ah; the same as your current battery or slightly more is fine.
- With the terminals facing you, the positive terminal of the SLA12-18 is on the right.
- The SLA12-18 needs 182 × 77 × 168 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Fulbat SLA12-18

### SLA12-18 or SLA12-20: which one suits me?

Compared with the SLA12-18, the Fulbat SLA12-20 has 2.20 Ah more and 30 A more cranking power. If your current battery says 180 A or more, choose the SLA12-20; if it says 150 A or less, the SLA12-18 is enough. Both measure 182 × 77 × 168 mm, so they fit the same tray.

### How much does the Fulbat SLA12-18 weigh?

4.95 kg, with 18.9 Ah of capacity. For reference, the Fulbat SLA12-20 (21.1 Ah) weighs 5.3 kg.

### Which battery is equivalent to the Fulbat SLA12-18?

Only other AGM batteries with its dimensions and polarity: Fulbat SLA12-20. Neither an EFB nor a conventional battery replaces the SLA12-18.

### Which side is the positive terminal on the Fulbat SLA12-18?

On the SLA12-18, the positive terminal is on the right with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### Which charger does the Fulbat SLA12-18 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.

## Keep comparing: alternatives to the SLA12-18

- [All lawn mower and garden machinery batteries](https://bateriasonline.es/en/lawn-mower-garden-batteries)
- [Full Fulbat catalogue](https://bateriasonline.es/en/fulbat-batteries)
- [Fulbat SLA12-20](https://bateriasonline.es/en/fulbat-sla12-20) · 21.1 Ah, 180 A, 182×77×168 mm

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