# Fulbat FP12-40 · UPS battery 12V 40Ah

![Fulbat FP12-40 · UPS battery 12V 40Ah](https://bateriasonline.es/728-home_default/fulbat-fp12-40.jpg)

> Fulbat FP12-40: 40 Ah UPS battery, 197×165×170 mm, AGM. Equivalent to Q-Battery 12LS-38 and Long WPS40-12. Price on request: ask for a free quote.

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-fp12-40
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FP12-40
- **MPN**: FP12-40
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT FP General Purpose |
| Application | UPS systems |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 40 Ah |
| Length | 197 mm |
| Width | 165 mm |
| Height | 170 mm |
| Weight | 12 kg |
| Terminal layout | 2 |
| Terminal type | T6 |

## Quick description

Fulbat FP12-40: UPS battery with 12 V and 40 Ah, measuring 197 × 165 × 170 mm.

## Description

## The Fulbat FP12-40 at a glance

The Fulbat FP12-40 replaces the original batteries in a UPS. The FP12-40 spends most of its life on float charge, waiting for a power cut.
The FP12-40 belongs to the Fulbat FULBAT FP General Purpose range. [See all Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Inside the FP12-40: AGM technology

Inside, the FP12-40 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Fulbat FP12-40 vs FP12-50 and FP12-33: which one to choose?

What sets the FP12-40 apart from its neighbours in the Fulbat range:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Fulbat FP12-40 (this one) | 40 Ah | 197 × 165 × 170 | 12 kg |
| Fulbat FP12-50 | 50 Ah | 197 × 165 × 170 | 14.2 kg |
| Fulbat FP12-33 | 33 Ah | 195 × 130 × 178 | 10.5 kg |

- Fulbat FP12-50: 10 Ah more, the same dimensions.
- Fulbat FP12-33: 7 Ah less, a different case (195 × 130 × 178 mm).

## Equivalents and alternatives to the Fulbat FP12-40

Other AGM batteries that fit the FP12-40's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Q-Battery 12LS-38 | AGM | 38 Ah | 197 × 165 × 170 |
| Long WPS40-12 | AGM | 40 Ah | 199 × 166 × 171 |
| Long WPS40-12N | AGM | 40 Ah | 199 × 166 × 171 |
| Long WPL40-12 | AGM | 40 Ah | 199 × 166 × 171 |
| Long WPL40-12N | AGM | 40 Ah | 199 × 166 × 171 |
| Fulbat FP12-40FR | AGM | 40 Ah | 197 × 165 × 170 |

## Part numbers and codes for the Fulbat FP12-40

Shops, garages and catalogues identify the FP12-40 with these codes:

| Commercial reference | FP12-40 |
|---|---|
| Terminal type | T6 |
| Not to be confused with | Fulbat FLP12-40 (40 Ah), Fulbat FP12-4L (4 Ah, positive terminal on the left), Fulbat FP12-4.5 (4.5 Ah, positive terminal on the left) |

## Check this before ordering the Fulbat FP12-40

- Your current battery should say about 40 Ah; a little more is also fine.
- Measure the space: the FP12-40 takes up 197 × 165 × 170 mm.

## Frequently asked questions about the Fulbat FP12-40

### FP12-40 or FP12-50: which one suits me?

Compared with the FP12-40, the Fulbat FP12-50 has 10 Ah more. With 50 Ah, the FP12-50 runs longer between charges than the FP12-40 (40 Ah). Both measure 197 × 165 × 170 mm, so they fit the same tray.

### How much does the Fulbat FP12-40 weigh?

12 kg, with 40 Ah of capacity. For reference, the Fulbat FP12-50 (50 Ah) weighs 14.2 kg.

### Which battery is equivalent to the Fulbat FP12-40?

Only other AGM batteries with its dimensions and polarity: Q-Battery 12LS-38, Long WPS40-12 and Long WPS40-12N. Neither an EFB nor a conventional battery replaces the FP12-40.

### Which charger does the Fulbat FP12-40 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 FP12-40

- [All uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [Full Fulbat catalogue](https://bateriasonline.es/en/fulbat-batteries)
- [Q-Battery 12LS-38](https://bateriasonline.es/en/q-battery-12ls-38) · 38 Ah, 197×165×170 mm
- [Long WPS40-12](https://bateriasonline.es/en/long-wps40-12) · 40 Ah, 199×166×171 mm

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