# Ritar RT12120 · UPS battery 12V 12Ah

![Ritar RT12120 · UPS battery 12V 12Ah](https://bateriasonline.es/3017-home_default/ritar-rt12120.jpg)

> Ritar RT12120: 12 Ah UPS battery, 151×98×101 mm, AGM. Equivalent to Fulbat FP12-12FR and Long WP1251W.

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

- **Canonical URL**: https://bateriasonline.es/en/ritar-rt12120
- **Language**: en
- **Brand**: Ritar
- **Reference**: BOL-RITAR-RT12120
- **MPN**: RT12120
- **Price**: 64,59 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Ritar |
| Range | RITAR RT |
| Application | UPS systems |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 12 Ah |
| Length | 151 mm |
| Width | 98 mm |
| Height | 101 mm |
| Weight | 3.5 kg |
| Terminal type | F1/F2 |

## Quick description

Ritar RT12120: UPS battery with 12 V and 12 Ah, measuring 151 × 98 × 101 mm.

## Description

## The Ritar RT12120 at a glance

The Ritar RT12120 replaces the original batteries in a UPS. The RT12120 spends most of its life on float charge, waiting for a power cut.
The RT12120 belongs to the Ritar RITAR RT range. [See all Ritar batteries](https://bateriasonline.es/en/ritar-batteries)

## What it means that the RT12120 is AGM

Inside, the RT12120 has glass fibre separators (AGM) that hold the electrolyte. The RT12120 needs a charger with an AGM mode that does not exceed 14.7 V.

## Ritar RT12120 vs RT1290: which one to choose?

What sets the RT12120 apart from its neighbours in the Ritar range:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Ritar RT12120 (this one) | 12 Ah | 151 × 98 × 101 | 3.5 kg |
| Ritar RT1290 | 9 Ah | 151 × 65 × 100 | 2.3 kg |

- Ritar RT1290: 3 Ah less, a different case (151 × 65 × 100 mm).

## Equivalents and alternatives to the Ritar RT12120

Other AGM batteries that fit the RT12120's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Fulbat FP12-12FR | AGM | 12 Ah | 151 × 98 × 101 |
| Long WP1251W | AGM | 12 Ah | 151 × 98 × 98 |
| Long WPL12-12 | AGM | 12 Ah | 151 × 98 × 98 |
| Long WPS12-12 | AGM | 12 Ah | 151 × 98 × 98 |
| Long WPS12-12T | AGM | 12 Ah | 151 × 98 × 104 |
| Long WPL14-12S | AGM | 14 Ah | 151 × 98 × 100 |

## Part numbers and codes for the Ritar RT12120

This is how the Ritar RT12120 appears on the label and in parts catalogues:

| Commercial reference | RT12120 |
|---|---|
| Terminal type | F1/F2 |
| Not to be confused with | Ritar RT12180 (18 Ah) |

## What to look at before buying the RT12120

- Your current battery should say about 12 Ah; a little more is also fine.
- The RT12120 needs 151 × 98 × 101 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Ritar RT12120

### RT12120 or RT1290: which one suits me?

Compared with the RT12120, the Ritar RT1290 has 3 Ah less. With 12 Ah, the RT12120 runs longer between charges than the RT1290 (9 Ah). Mind the space: the RT1290 measures 151 × 65 × 100 mm.

### How much does the Ritar RT12120 weigh?

3.5 kg, with 12 Ah of capacity. For reference, the Ritar RT1290 (9 Ah) weighs 2.3 kg.

### Which battery is equivalent to the Ritar RT12120?

Only other AGM batteries with its dimensions and polarity: Fulbat FP12-12FR, Long WP1251W and Long WPL12-12. Neither an EFB nor a conventional battery replaces the RT12120.

### Which charger does the Ritar RT12120 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 RT12120

- [All uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [The whole Ritar range](https://bateriasonline.es/en/ritar-batteries)
- [Fulbat FP12-12FR](https://bateriasonline.es/en/fulbat-fp12-12fr) · 12 Ah, 151×98×101 mm
- [Long WP1251W](https://bateriasonline.es/en/long-wp1251w) · 12 Ah, 151×98×98 mm

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