# Ritar RT628 · UPS battery 6V 2.8Ah

![Ritar RT628 · UPS battery 6V 2.8Ah](https://bateriasonline.es/3061-home_default/ritar-rt628.jpg)

> Ritar RT628: 2.8 Ah UPS battery, 66×33×104 mm, AGM. Equivalent to Fulbat FP6-2.8. Compare sizes and equivalents; 14-day returns.

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

- **Canonical URL**: https://bateriasonline.es/en/ritar-rt628
- **Language**: en
- **Brand**: Ritar
- **Reference**: BOL-RITAR-RT628
- **MPN**: RT628
- **Price**: 20,68 € (VAT incl., Spain)
- **Last updated**: 2026-11-06

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Ritar |
| Range | RITAR RT |
| Application | UPS systems |
| Technology | AGM |
| Voltage | 6 V |
| Capacity | 2.8 Ah |
| Length | 66 mm |
| Width | 33 mm |
| Height | 104 mm |
| Weight | 0.53 kg |
| Terminal type | F1 |

## Quick description

The Ritar RT628 is an UPS battery with 6 V and 2.8 Ah, measuring 66 × 33 × 104 mm.

## Description

## Where the Ritar RT628 fits

The Ritar RT628 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. Before ordering the RT628, check the terminal type and terminal orientation in your UPS.
The RT628 belongs to the Ritar RITAR RT range. [More Ritar batteries](https://bateriasonline.es/en/ritar-batteries)

## AGM technology in the RT628

The RT628 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.

## Ritar RT628 vs RT632

How the RT628 compares with Ritar batteries of similar size and capacity:

| Model | Capacity | Dimensions (mm) | Weight |
|---|---|---|---|
| Ritar RT628 (this one) | 2.8 Ah | 66 × 33 × 104 | 0.53 kg |
| Ritar RT632 | 3.2 Ah | 134 × 35 × 67 | 0.6 kg |

- Ritar RT632: 0.40 Ah more, a different case (134 × 35 × 67 mm).

## Equivalents and alternatives to the Ritar RT628

Other AGM batteries that fit the RT628's tray with the same polarity: an AGM can only be replaced by another AGM.

| Model | Technology | Capacity | Dimensions (mm) |
|---|---|---|---|
| Fulbat FP6-2.8 | AGM | 2.8 Ah | 66 × 33 × 103 |

## Part numbers and codes for the Ritar RT628

The RT628 is listed under these codes on labels, in garages and in catalogues:

| Commercial reference | RT628 |
|---|---|
| Terminal type | F1 |

## Before ordering the RT628, check this

- Your current battery should say about 2.8 Ah; a little more is also fine.
- The RT628 needs 66 × 33 × 104 mm of space: measure it with the hold-down clamp in place.

## Frequently asked questions about the Ritar RT628

### RT628 or RT632: which one suits me?

Compared with the RT628, the Ritar RT632 has 0.40 Ah more. With 3.2 Ah, the RT632 runs longer between charges than the RT628 (2.8 Ah). Mind the space: the RT632 measures 134 × 35 × 67 mm.

### How much does the Ritar RT628 weigh?

0.53 kg, with 2.8 Ah of capacity. For reference, the Ritar RT632 (3.2 Ah) weighs 0.6 kg.

### Which battery is equivalent to the Ritar RT628?

Only other AGM batteries with its dimensions and polarity: Fulbat FP6-2.8. Neither an EFB nor a conventional battery replaces the RT628.

### 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.

## More batteries to compare with the RT628

- [Other uPS batteries](https://bateriasonline.es/en/ups-batteries)
- [More Ritar models](https://bateriasonline.es/en/ritar-batteries)
- [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 · 2026-11-11*