# Fulbat FP6-4 · UPS battery 6V 4Ah

![Fulbat FP6-4 · UPS battery 6V 4Ah](https://bateriasonline.es/613-home_default/fulbat-fp6-4.jpg)

> Fulbat FP6-4: 4 Ah UPS battery, 70×47×106 mm, AGM. Equivalent to Long WPS4-6 and Long WP4.5-6. 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-fp6-4
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FP6-4
- **MPN**: FP6-4
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT FP General Purpose |
| Application | UPS systems |
| Technology | AGM |
| Voltage | 6 V |
| Capacity | 4 Ah |
| Length | 70 mm |
| Width | 47 mm |
| Height | 106 mm |
| Weight | 0.65 kg |
| Terminal layout | 5 |
| Terminal type | T1 |

## Quick description

Fulbat FP6-4: UPS battery with 6 V and 4 Ah, measuring 70 × 47 × 106 mm.

## Description

## Who the Fulbat FP6-4 is for

The Fulbat FP6-4 replaces the original batteries in a UPS. The FP6-4 spends most of its life on float charge, waiting for a power cut.
The FP6-4 belongs to the Fulbat FULBAT FP General Purpose range. [See all Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## What it means that the FP6-4 is AGM

Inside, the FP6-4 has glass fibre separators (AGM) that hold the electrolyte. The FP6-4 needs a charger with an AGM mode that does not exceed 14.7 V.

## Fulbat FP6-4 vs FP6-4.5 and FP6-4.5S

What sets the FP6-4 apart from its neighbours in the Fulbat range:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Fulbat FP6-4 (this one) | 4 Ah | 70 × 47 × 106 | 0.65 kg |
| Fulbat FP6-4.5 | 4.5 Ah | 70 × 47 × 106 | 0.81 kg |
| Fulbat FP6-4.5S | 4.5 Ah | 67 × 67 × 109 | 0.78 kg |

- Fulbat FP6-4.5: 0.5 Ah more, the same dimensions.
- Fulbat FP6-4.5S: 0.5 Ah more, a different case (67 × 67 × 109 mm).

## Equivalents and alternatives to the Fulbat FP6-4

Other AGM batteries that fit the FP6-4's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Long WPS4-6 | AGM | 4 Ah | 70 × 47 × 106 |
| Long WP4.5-6 | AGM | 4.5 Ah | 70 × 47 × 106 |
| Ritar RT645 | AGM | 4.5 Ah | 70 × 47 × 107 |
| Long WP5-6 | AGM | 5 Ah | 70 × 47 × 106 |
| Fulbat FP6-4.5 | AGM | 4.5 Ah | 70 × 47 × 106 |
| Fulbat FP6-6 | AGM | 6 Ah | 70 × 47 × 106 |

## Part numbers and codes for the Fulbat FP6-4

This is how the Fulbat FP6-4 appears on the label and in parts catalogues:

| Commercial reference | FP6-4 |
|---|---|
| Terminal type | T1 |
| Not to be confused with | Fulbat FP6-4.5 (4.5 Ah), Fulbat FP6-6 (6 Ah), Fulbat FP6-5 (5 Ah, positive terminal on the left) |

## Check this before ordering the Fulbat FP6-4

- Your current battery should say about 4 Ah; a little more is also fine.
- Measure the space: the FP6-4 takes up 70 × 47 × 106 mm.

## Frequently asked questions about the Fulbat FP6-4

### FP6-4 or FP6-4.5: which one suits me?

Compared with the FP6-4, the Fulbat FP6-4.5 has 0.5 Ah more. With 4.5 Ah, the FP6-4.5 runs longer between charges than the FP6-4 (4 Ah). Both measure 70 × 47 × 106 mm, so they fit the same tray.

### How much does the Fulbat FP6-4 weigh?

0.65 kg, with 4 Ah of capacity. For reference, the Fulbat FP6-4.5 (4.5 Ah) weighs 0.81 kg.

### Which battery is equivalent to the Fulbat FP6-4?

Only other AGM batteries with its dimensions and polarity: Long WPS4-6, Long WP4.5-6 and Ritar RT645. Neither an EFB nor a conventional battery replaces the FP6-4.

### How often are UPS batteries replaced?

Every 3 to 5 years, or sooner if the unit warns of low battery or the runtime has dropped. Heat in the cabinet shortens their life a lot.

## Keep comparing: alternatives to the FP6-4

- [Other uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [Full Fulbat catalogue](https://bateriasonline.es/en/fulbat-batteries)
- [Fulbat FP4-3.5](https://bateriasonline.es/en/fulbat-fp4-3-5) · 3.5 Ah, 90×34×65 mm
- [Fulbat FP6-2.8](https://bateriasonline.es/en/fulbat-fp6-2-8) · 2.8 Ah, 66×33×103 mm

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