# Long WP4A-BS · UPS battery 12V 2.3Ah

![Long WP4A-BS · UPS battery 12V 2.3Ah](https://bateriasonline.es/915-home_default/long-wp4a-bs.jpg)

> Long WP4A-BS: 2.3 Ah UPS battery, 113×48×85 mm, AGM. 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-wp4a-bs
- **Language**: en
- **Brand**: Long
- **Reference**: BOL-LONG-WP4A-BS
- **MPN**: WP4A-BS
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Long |
| Range | Starting Series |
| Application | UPS systems |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 2.3 Ah |
| Length | 113 mm |
| Width | 48 mm |
| Height | 85 mm |
| Weight | 1.21 kg |

## Quick description

The Long WP4A-BS is an UPS battery with 12 V and 2.3 Ah, measuring 113 × 48 × 85 mm.

## Description

## Where the Long WP4A-BS fits

The Long WP4A-BS 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 WP4A-BS spends most of its life on float charge, waiting for a power cut.
The WP4A-BS belongs to the Long Starting Series range. [See all Long batteries](https://bateriasonline.es/en/long-batteries)

## Equivalents and alternatives to the Long WP4A-BS

No other reference in the catalogue fully matches the dimensions and polarity of the WP4A-BS; you will find the closest ones among our [uPS batteries](https://bateriasonline.es/en/ups-batteries).

## Long WP4A-BS vs WP3-12 and WP2.9-12T: which one to choose?

Torn between the WP4A-BS and another similar Long? This is what changes:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Long WP4A-BS (this one) | 2.3 Ah | 113 × 48 × 85 | 1.21 kg |
| Long WP3-12 | 3 Ah | 134 × 67 × 65.5 | 1.3 kg |
| Long WP2.9-12T | 2.9 Ah | 79 × 56 × 107 | 1.19 kg |

- Long WP3-12: 0.70 Ah more, a different case (134 × 67 × 65.5 mm).
- Long WP2.9-12T: 0.60 Ah more, a different case (79 × 56 × 107 mm).

## AGM technology in the WP4A-BS

The WP4A-BS 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.

## What to look at before buying the WP4A-BS

- The WP4A-BS needs 113 × 48 × 85 mm of space: measure it with the hold-down clamp in place.
- Capacity of the WP4A-BS: 2.3 Ah; the same as your current battery or slightly more is fine.

## Long WP4A-BS codes and part numbers

The WP4A-BS is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | WP4A-BS |
|---|---|
| Not to be confused with | Long WP7A-BS (7 Ah) |

## Frequently asked questions about the Long WP4A-BS

### Long WP4A-BS or WP3-12?

Compared with the WP4A-BS, the Long WP3-12 has 0.70 Ah more. With 3 Ah, the WP3-12 runs longer between charges than the WP4A-BS (2.3 Ah). Mind the space: the WP3-12 measures 134 × 67 × 65.5 mm.

### How much does the Long WP4A-BS weigh?

The WP4A-BS weighs 1.21 kg. For reference, the Long WP3-12 (3 Ah) weighs 1.3 kg.

### Which charger does the Long WP4A-BS 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.

## More batteries to compare with the WP4A-BS

- [Other uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [Full Long catalogue](https://bateriasonline.es/en/long-batteries)

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