# Fulbat FP12-20 · UPS battery 12V 20Ah

![Fulbat FP12-20 · UPS battery 12V 20Ah](https://bateriasonline.es/699-home_default/fulbat-fp12-20.jpg)

> Fulbat FP12-20: 20 Ah UPS battery, 181.5×77×167.5 mm, AGM. Equivalent to Long WXL1280WN and Ritar RT12180. 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-fp12-20
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FP12-20
- **MPN**: FP12-20
- **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 | 20 Ah |
| Length | 181.5 mm |
| Width | 77 mm |
| Height | 167.5 mm |
| Weight | 5.65 kg |
| Terminal layout | 2 |
| Terminal type | T12 |

## Quick description

The Fulbat FP12-20 is an UPS battery with 12 V and 20 Ah, measuring 181.5 × 77 × 167.5 mm.

## Description

## Who the Fulbat FP12-20 is for

The Fulbat FP12-20 replaces the original batteries in a UPS. The FP12-20 spends most of its life on float charge, waiting for a power cut.
The FP12-20 belongs to the Fulbat FULBAT FP General Purpose range. [The full range of Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## AGM technology in the FP12-20

Inside, the FP12-20 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Fulbat FP12-20 vs FP12-18 and FP12-18FR

Torn between the FP12-20 and another similar Fulbat? This is what changes:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Fulbat FP12-20 (this one) | 20 Ah | 181.5 × 77 × 167.5 | 5.65 kg |
| Fulbat FP12-18 | 18 Ah | 181.5 × 76.5 × 167.5 | 5.35 kg |
| Fulbat FP12-18FR | 18 Ah | 181.5 × 76.5 × 167.5 | 5.35 kg |

- Fulbat FP12-18: 2 Ah less, the same dimensions.
- Fulbat FP12-18FR: 2 Ah less, the same dimensions.

## Equivalents and alternatives to the Fulbat FP12-20

Other AGM batteries that fit the FP12-20's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Long WXL1280WN | AGM | 20 Ah | 181 × 76 × 167 |
| Ritar RT12180 | AGM | 18 Ah | 181 × 77 × 167 |
| Q-Battery 12LS-18 | AGM | 18 Ah | 181 × 77 × 167 |
| Long WP18-12NSHR | AGM | 18 Ah | 181 × 76 × 167 |
| Long WP18-12SHR | AGM | 18 Ah | 181 × 76 × 167 |
| Long WPL18-12SHR | AGM | 18 Ah | 181 × 76 × 167 |

## Part numbers and codes for the Fulbat FP12-20

Shops, garages and catalogues identify the FP12-20 with these codes:

| Commercial reference | FP12-20 |
|---|---|
| Terminal type | T12 |
| Not to be confused with | Fulbat FP12-120 (124.8 Ah, positive terminal on the left), Fulbat FP12-2.2 (2.2 Ah, positive terminal on the left), Fulbat FP12-2.3 (2.3 Ah, positive terminal on the left) |

## Before ordering the FP12-20, check this

- Capacity of the FP12-20: 20 Ah; the same as your current battery or slightly more is fine.
- Measure the space: the FP12-20 takes up 181.5 × 77 × 167.5 mm.

## Frequently asked questions about the Fulbat FP12-20

### FP12-20 or FP12-18: which one suits me?

Compared with the FP12-20, the Fulbat FP12-18 has 2 Ah less. With 20 Ah, the FP12-20 runs longer between charges than the FP12-18 (18 Ah). Both measure 181.5 × 77 × 167.5 mm, so they fit the same tray.

### How much does the Fulbat FP12-20 weigh?

5.65 kg, with 20 Ah of capacity. For reference, the Fulbat FP12-18 (18 Ah) weighs 5.35 kg.

### Which battery is equivalent to the Fulbat FP12-20?

Only other AGM batteries with its dimensions and polarity: Long WXL1280WN, Ritar RT12180 and Q-Battery 12LS-18. Neither an EFB nor a conventional battery replaces the FP12-20.

## Keep comparing: alternatives to the FP12-20

- [Other uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [More Fulbat models](https://bateriasonline.es/en/fulbat-batteries)
- [Long WXL1280WN](https://bateriasonline.es/en/long-wxl1280wn) · 20 Ah, 181×76×167 mm
- [Ritar RT12180](https://bateriasonline.es/en/ritar-rt12180) · 18 Ah, 181×77×167 mm

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