# Long WP1251W · UPS battery 12V 12Ah

![Long WP1251W · UPS battery 12V 12Ah](https://bateriasonline.es/957-home_default/long-wp1251w.jpg)

> Long WP1251W: 12 Ah UPS battery, 151×98×98 mm, AGM. Equivalent to Fulbat FP12-12FR and Ritar RT12120. Ask for a no-obligation quote.

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

- **Canonical URL**: https://bateriasonline.es/en/long-wp1251w
- **Language**: en
- **Brand**: Long
- **Reference**: BOL-LONG-WP1251W
- **MPN**: WP1251W
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Long |
| Range | WP WATT Series |
| Application | UPS systems |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 12 Ah |
| Length | 151 mm |
| Width | 98 mm |
| Height | 98 mm |
| Weight | 3.65 kg |
| Energy | 51 Wh |

## Quick description

Long WP1251W: UPS battery with 12 V and 12 Ah, measuring 151 × 98 × 98 mm.

## Description

## Where the Long WP1251W fits

The Long WP1251W is a VRLA AGM battery for UPS and uninterruptible power systems: it stays charged for years waiting for an outage and delivers the energy instantly when it comes. The WP1251W spends most of its life on float charge, waiting for a power cut.
The WP1251W belongs to the Long WP WATT Series range. [See all Long batteries](https://bateriasonline.es/en/long-batteries)

## Equivalents and alternatives to the Long WP1251W

Other AGM batteries that fit the WP1251W'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 |
| Ritar RT12120 | AGM | 12 Ah | 151 × 98 × 101 |
| Q-Battery 12LS-12 F1 | AGM | 12 Ah | 151 × 98 × 95 |
| Q-Battery 12LS-12 F2 | AGM | 12 Ah | 151 × 98 × 95 |
| Q-Battery 12LSX-28 | AGM | 12 Ah | 151 × 98 × 95 |
| Long WPL12-12 | AGM | 12 Ah | 151 × 98 × 98 |

## Long WP1251W vs WPL14-12S and WP12A-BS: differences

What sets the WP1251W apart from its neighbours in the Long range:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Long WP1251W (this one) | 12 Ah | 151 × 98 × 98 | 3.65 kg |
| Long WPL14-12S | 14 Ah | 151 × 98 × 100 | 4.3 kg |
| Long WP12A-BS | 9.5 Ah | 151 × 88 × 103 | 3.56 kg |

- Long WPL14-12S: 2 Ah more, the same dimensions.
- Long WP12A-BS: 2.5 Ah less, a different case (151 × 88 × 103 mm).

## What it means that the WP1251W is AGM

The WP1251W 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.

## Check this before ordering the Long WP1251W

- The WP1251W needs 151 × 98 × 98 mm of space: measure it with the hold-down clamp in place.
- Your current battery should say about 12 Ah; a little more is also fine.

## Frequently asked questions about the Long WP1251W

### WP1251W or WPL14-12S: which one suits me?

Compared with the WP1251W, the Long WPL14-12S has 2 Ah more. With 14 Ah, the WPL14-12S runs longer between charges than the WP1251W (12 Ah). Both measure 151 × 98 × 98 mm, so they fit the same tray.

### How much does the Long WP1251W weigh?

3.65 kg, with 12 Ah of capacity. For reference, the Long WPL14-12S (14 Ah) weighs 4.3 kg.

### Which battery is equivalent to the Long WP1251W?

Only other AGM batteries with its dimensions and polarity: Fulbat FP12-12FR, Ritar RT12120 and Q-Battery 12LS-12 F1. Neither an EFB nor a conventional battery replaces the WP1251W.

### What is the difference between F1 and F2 terminals?

The tab width: F1 is 4.8 mm and F2 is 6.35 mm. Most UPS units use F2; check your unit's connector before ordering.

## More batteries to compare with the WP1251W

- [All uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [Full Long catalogue](https://bateriasonline.es/en/long-batteries)
- [Long WP14B-4](https://bateriasonline.es/en/long-wp14b-4) · 12 Ah, 150×69×145 mm

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