# Q-Battery 12SEM-120 · Motorhome battery 12V 120Ah

![Q-Battery 12SEM-120 · Motorhome battery 12V 120Ah](https://bateriasonline.es/3465-home_default/q-battery-12sem-120.jpg)

> Q-Battery 12SEM-120: 120 Ah motorhome battery, 347×175×234 mm, positive terminal on the right. Compare sizes and equivalents; 14-day returns.

**Category:** [Leisure batteries for motorhomes and caravans](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan) → [Q-Battery](https://bateriasonline.es/en/q-battery-batteries)

- **Canonical URL**: https://bateriasonline.es/en/q-battery-12sem-120
- **Language**: en
- **Brand**: Q-Battery
- **Reference**: BOL-QBATTERY-12SEM-120
- **MPN**: 12SEM-120
- **Price**: 233,44 € (VAT incl., Spain)
- **Last updated**: 2026-11-07

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Q-Battery |
| Range | SEMITRACTION BATTERY |
| Application | Motorhomes and caravans |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 120 Ah |
| Length | 347 mm |
| Width | 175 mm |
| Height | 234 mm |
| Weight | 29.9 kg |
| Polarity | Positive terminal on the right |
| Terminal type | A-Pole |

## Quick description

Q-Battery 12SEM-120: motorhome battery with 12 V and 120 Ah, measuring 347 × 175 × 234 mm, with the positive terminal on the right.

## Description

## Who the Q-Battery 12SEM-120 is for

The Q-Battery 12SEM-120 is a leisure battery for motorhomes and caravans: it powers fridge, lights, water pump and heating for days without starting the engine. With 120 Ah, the 12SEM-120 runs the leisure loads for several nights depending on use.
The 12SEM-120 belongs to the Q-Battery SEMITRACTION BATTERY range. [More Q-Battery batteries](https://bateriasonline.es/en/q-battery-batteries)

## Equivalents and alternatives to the Q-Battery 12SEM-120

No other reference in the catalogue fully matches the dimensions and polarity of the 12SEM-120; you will find the closest ones among our [leisure batteries for motorhomes and caravans](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan).

## Q-Battery 12SEM-120 vs 12SEM-105 and 12SEM-135

What sets the 12SEM-120 apart from its neighbours in the Q-Battery range:

| Model | Capacity | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|
| Q-Battery 12SEM-120 (this one) | 120 Ah | 347 × 175 × 234 | right | 29.9 kg |
| Q-Battery 12SEM-105 | 105 Ah | 353 × 175 × 190 | right | 25 kg |
| Q-Battery 12SEM-135 | 135 Ah | 349 × 175 × 290 | right | 37.8 kg |

- Q-Battery 12SEM-105: 15 Ah less, a different case (353 × 175 × 190 mm).
- Q-Battery 12SEM-135: 15 Ah more, a different case (349 × 175 × 290 mm).

## What it means that the 12SEM-120 is lead-acid

The 12SEM-120 is a conventional lead-acid battery, with plates immersed in liquid electrolyte. In cars without energy management, the 12SEM-120 needs no special registration: just connect it.

## Before ordering the 12SEM-120, check this

- The 12SEM-120 needs 347 × 175 × 234 mm of space: measure it with the hold-down clamp in place.
- Polarity of the 12SEM-120: positive terminal on the right (if yours has it on the other side, the cables will not reach).
- Capacity of the 12SEM-120: 120 Ah; the same as your current battery or slightly more is fine.

## Q-Battery 12SEM-120 codes and part numbers

Look for any of these 12SEM-120 codes on your current battery or in the manufacturer's catalogue:

| Commercial reference | 12SEM-120 |
|---|---|
| Terminal type | A-Pole |
| Not to be confused with | Q-Battery 12SEM-180 (180 Ah) |

## Frequently asked questions about the Q-Battery 12SEM-120

### Q-Battery 12SEM-120 or 12SEM-105?

Compared with the 12SEM-120, the Q-Battery 12SEM-105 has 15 Ah less. With 120 Ah, the 12SEM-120 runs longer between charges than the 12SEM-105 (105 Ah). Mind the space: the 12SEM-105 measures 353 × 175 × 190 mm.

### How much does the Q-Battery 12SEM-120 weigh?

The 12SEM-120 weighs 29.9 kg. For reference, the Q-Battery 12SEM-105 (105 Ah) weighs 25 kg.

### Which side is the positive terminal on the Q-Battery 12SEM-120?

The 12SEM-120 has the positive terminal on the right, looking at the battery from its long side with the terminals closest to you.

## More batteries to compare with the 12SEM-120

- [All leisure batteries for motorhomes and caravans](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan)
- [Full Q-Battery catalogue](https://bateriasonline.es/en/q-battery-batteries)
- [Q-Battery 12SEM-60](https://bateriasonline.es/en/q-battery-12sem-60) · 60 Ah, 246×175×190 mm

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