# Fulbat U1-9 SLA · Lawn mower battery 12V 28Ah 300A

![Fulbat U1-9 SLA · Lawn mower battery 12V 28Ah 300A](https://bateriasonline.es/620-home_default/fulbat-u1-9-sla.jpg)

> Fulbat U1-9 SLA: 28 Ah lawn mower battery, 300 A (EN), 195×125×176 mm, positive terminal on the left, AGM. 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-u1-9-sla
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-U1-9 SLA
- **MPN**: U1-9 SLA
- **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 | 28 Ah |
| Cold cranking amps (EN) | 300 A |
| Length | 195 mm |
| Width | 125 mm |
| Height | 176 mm |
| Weight | 6.45 kg |
| Polarity | Positive terminal on the left |

## Quick description

The Fulbat U1-9 SLA is a lawn mower battery with 12 V, 28 Ah and 300 A cold cranking current, measuring 195 × 125 × 176 mm, with the positive terminal on the left. Need the positive terminal on the right? The same battery is the Fulbat U1R-9 SLA.

## Description

## Where the Fulbat U1-9 SLA fits

The Fulbat U1-9 SLA starts ride-on mowers and garden tractors. Check polarity and terminal type: garden machinery uses several formats.
The U1-9 SLA belongs to the Fulbat FULBAT Lawn & Garden SLA range. [See all Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat U1-9 SLA

We have no other battery with exactly the dimensions and polarity of the U1-9 SLA. Browse the rest of our [lawn mower and garden machinery batteries](https://bateriasonline.es/en/lawn-mower-garden-batteries) to compare close options.

## Fulbat U1-9 SLA vs U1-12 SLA and U1R-9 SLA: differences

How the U1-9 SLA compares with Fulbat batteries of similar size and capacity:

| Model | Capacity | Cold cranking (EN) | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|---|
| Fulbat U1-9 SLA (this one) | 28 Ah | 300 A | 195 × 125 × 176 | left | 6.45 kg |
| Fulbat U1-12 SLA | 32 Ah | 400 A | 195 × 125 × 176 | left | 6.7 kg |
| Fulbat U1R-9 SLA | 28 Ah | 300 A | 195 × 125 × 176 | right | 6.45 kg |

- Fulbat U1-12 SLA: 4 Ah more, 100 A more cranking power, the same dimensions.
- If the positive terminal of your battery is on the other side, the one you need is the Fulbat U1R-9 SLA (positive terminal on the right).

## What it means that the U1-9 SLA is AGM

Inside, the U1-9 SLA has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Check this before ordering the Fulbat U1-9 SLA

- The U1-9 SLA needs 195 × 125 × 176 mm of space: measure it with the hold-down clamp in place.
- The U1-9 SLA has the positive terminal on the left: compare it with your current battery.
- With 28 Ah, the U1-9 SLA replaces an original battery of that capacity or slightly less.
- Check the EN amps on your battery: if it says 300 A or less, the U1-9 SLA covers your engine.

## Part numbers and codes for the Fulbat U1-9 SLA

Shops, garages and catalogues identify the U1-9 SLA with these codes:

| Commercial reference | U1-9 SLA |
|---|---|
| Not to be confused with | Fulbat U1R-9 SLA (28 Ah, 300 A, positive terminal on the right) |

## Frequently asked questions about the Fulbat U1-9 SLA

### U1-9 SLA or U1-12 SLA: which one suits me?

Compared with the U1-9 SLA, the Fulbat U1-12 SLA has 4 Ah more and 100 A more cranking power. If your current battery says 400 A or more, choose the U1-12 SLA; if it says 300 A or less, the U1-9 SLA is enough. Both measure 195 × 125 × 176 mm, so they fit the same tray.

### Fulbat U1-9 SLA or U1R-9 SLA: what is the difference?

Only the polarity: the U1-9 SLA has the positive terminal on the left and the U1R-9 SLA the positive terminal on the right. Capacity (28 Ah), cranking power and dimensions are identical.

### How much does the Fulbat U1-9 SLA weigh?

6.45 kg, with 28 Ah of capacity. For reference, the Fulbat U1-12 SLA (32 Ah) weighs 6.7 kg.

### Which charger does the Fulbat U1-9 SLA 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.

## Other options if you are unsure about the U1-9 SLA

- [More lawn mower and garden machinery batteries](https://bateriasonline.es/en/lawn-mower-garden-batteries)
- [Full Fulbat catalogue](https://bateriasonline.es/en/fulbat-batteries)
- [Fulbat SLA12-18](https://bateriasonline.es/en/fulbat-sla12-18) · 18.9 Ah, 150 A, 182×77×168 mm
- [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*