# Fullriver FT438-U1R · Auxiliary battery 12V 35Ah 438A

![Fullriver FT438-U1R · Auxiliary battery 12V 35Ah 438A](https://bateriasonline.es/2198-home_default/fullriver-ft438-u1r.jpg)

> Fullriver FT438-U1R: 35 Ah auxiliary battery, 438 A (EN), 196×131×192 mm, AGM. VAT included and shipping cost shown before you pay.

**Category:** [Auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries) → [Fullriver](https://bateriasonline.es/en/fullriver-batteries)

- **Canonical URL**: https://bateriasonline.es/en/fullriver-ft438-u1r
- **Language**: en
- **Brand**: Fullriver
- **Reference**: BOL-FULLRIVER-FT438-U1R
- **MPN**: FT438-U1R
- **Price**: 170,19 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Fullriver |
| Range | Full Throttle Series |
| Application | Auxiliary and back-up use |
| Technology | AGM |
| Voltage | 12 V |
| Capacity | 35 Ah |
| Cold cranking amps (EN) | 438 A |
| Length | 196 mm |
| Width | 131 mm |
| Height | 192 mm |
| Weight | 11.3 kg |
| Terminal type | M6 + TP26 (SAE) |

## Quick description

The Fullriver FT438-U1R is an auxiliary battery (AGM) with 12 V, 35 Ah and 438 A cold cranking current, measuring 196 × 131 × 192 mm.

## Description

## Where the Fullriver FT438-U1R fits

The Fullriver FT438-U1R is the second battery fitted in many modern cars. Without it, Start-Stop or back-up warnings appear on the dashboard.
The FT438-U1R belongs to the Fullriver Full Throttle Series range. [The full range of Fullriver batteries](https://bateriasonline.es/en/fullriver-batteries)

## Equivalents and alternatives to the Fullriver FT438-U1R

No other reference in the catalogue fully matches the dimensions and polarity of the FT438-U1R; you will find the closest ones among our [auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries).

## What it means that the FT438-U1R is AGM

Inside, the FT438-U1R has glass fibre separators (AGM) that hold the electrolyte. It is fitted in cars with advanced Start-Stop and in deep-cycle equipment.

## Check this before ordering the Fullriver FT438-U1R

- The FT438-U1R needs 196 × 131 × 192 mm of space: measure it with the hold-down clamp in place.
- With 35 Ah, the FT438-U1R replaces an original battery of that capacity or slightly less.
- Check the EN amps on your battery: if it says 438 A or less, the FT438-U1R covers your engine.

## Fullriver FT438-U1R codes and part numbers

Shops, garages and catalogues identify the FT438-U1R with these codes:

| Commercial reference | FT438-U1R |
|---|---|
| Terminal type | M6 + TP26 (SAE) |

## Frequently asked questions about the Fullriver FT438-U1R

### How much does the Fullriver FT438-U1R weigh?

The FT438-U1R weighs 11.3 kg.

### What is the cold cranking current of the Fullriver FT438-U1R?

438 A to the EN standard, with 35 Ah capacity.

### Which charger does the Fullriver FT438-U1R 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.

## Keep comparing: alternatives to the FT438-U1R

- [More auxiliary batteries (back-up and in-vehicle service)](https://bateriasonline.es/en/auxiliary-backup-batteries)
- [More Fullriver models](https://bateriasonline.es/en/fullriver-batteries)

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