# Fulbat FP4-3.5 · UPS battery 4V 3.5Ah

![Fulbat FP4-3.5 · UPS battery 4V 3.5Ah](https://bateriasonline.es/602-home_default/fulbat-fp4-3-5.jpg)

> Fulbat FP4-3.5: 3.5 Ah UPS battery, 90×34×65 mm, positive terminal on the left, AGM. Ask for a no-obligation quote.

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

- **Canonical URL**: https://bateriasonline.es/en/fulbat-fp4-3-5
- **Language**: en
- **Brand**: Fulbat
- **Reference**: BOL-FULBAT-FP4-3.5
- **MPN**: FP4-3.5
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fulbat |
| Range | FULBAT FP General Purpose |
| Application | UPS systems |
| Technology | AGM |
| Voltage | 4 V |
| Capacity | 3.5 Ah |
| Length | 90 mm |
| Width | 34 mm |
| Height | 65 mm |
| Weight | 0.45 kg |
| Polarity | Positive terminal on the left |
| Terminal type | T1 |

## Quick description

Fulbat FP4-3.5: UPS battery with 4 V and 3.5 Ah, measuring 90 × 34 × 65 mm, with the positive terminal on the left.

## Description

## The Fulbat FP4-3.5 at a glance

The Fulbat FP4-3.5 replaces the original batteries in a UPS. Before ordering the FP4-3.5, check the terminal type and terminal orientation in your UPS.
The FP4-3.5 belongs to the Fulbat FULBAT FP General Purpose range. [See all Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries)

## Equivalents and alternatives to the Fulbat FP4-3.5

No other reference in the catalogue fully matches the dimensions and polarity of the FP4-3.5; you will find the closest ones among our [uPS batteries](https://bateriasonline.es/en/ups-batteries).

## AGM technology in the FP4-3.5

Inside, the FP4-3.5 has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## What to look at before buying the FP4-3.5

- Length, width and height of the FP4-3.5: 90 × 34 × 65 mm.
- With the terminals facing you, the positive terminal of the FP4-3.5 is on the left.
- Your current battery should say about 3.5 Ah; a little more is also fine.

## Fulbat FP4-3.5 codes and part numbers

Shops, garages and catalogues identify the FP4-3.5 with these codes:

| Commercial reference | FP4-3.5 |
|---|---|
| Terminal type | T1 |

## Frequently asked questions about the Fulbat FP4-3.5

### How much does the Fulbat FP4-3.5 weigh?

The FP4-3.5 weighs 0.45 kg.

### Which side is the positive terminal on the Fulbat FP4-3.5?

The FP4-3.5 has the positive terminal on the left, looking at the battery from its long side with the terminals closest to you.

### 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 FP4-3.5

- [Other uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [The whole Fulbat range](https://bateriasonline.es/en/fulbat-batteries)

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