# Q-Battery 12SEM-135 · Motorhome battery 12V 135Ah

![Q-Battery 12SEM-135 · Motorhome battery 12V 135Ah](https://bateriasonline.es/3467-home_default/q-battery-12sem-135.jpg)

> Q-Battery 12SEM-135: 135 Ah motorhome battery, 349×175×290 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-135
- **Language**: en
- **Brand**: Q-Battery
- **Reference**: BOL-QBATTERY-12SEM-135
- **EAN**: 4250889600273
- **MPN**: 12SEM-135
- **Price**: 273,62 € (VAT incl., Spain)
- **Last updated**: 2026-10-27

## Technical specifications

| Feature | Value |
|---|---|
| Brand | Q-Battery |
| Range | SEMITRACTION BATTERY |
| Application | Motorhomes and caravans |
| Technology | Lead-acid |
| Voltage | 12 V |
| Capacity | 135 Ah |
| Length | 349 mm |
| Width | 175 mm |
| Height | 290 mm |
| Weight | 37.8 kg |
| Polarity | Positive terminal on the right |
| Terminal type | A-Pole |

## Quick description

Q-Battery 12SEM-135: motorhome battery with 12 V and 135 Ah, measuring 349 × 175 × 290 mm, with the positive terminal on the right.

## Description

## Who the Q-Battery 12SEM-135 is for

The Q-Battery 12SEM-135 is made for the living area of a motorhome. The 12SEM-135 powers the living area, separate from the vehicle's starter battery.
The 12SEM-135 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-135

We have no other battery with exactly the dimensions and polarity of the 12SEM-135. Browse the rest of our [leisure batteries for motorhomes and caravans](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan) to compare close options.

## Q-Battery 12SEM-135 vs 12DC-150 and 12SEM-120: differences

What sets the 12SEM-135 apart from its neighbours in the Q-Battery range:

| Model | Capacity | Dimensions (mm) | Positive | Weight |
|---|---|---|---|---|
| Q-Battery 12SEM-135 (this one) | 135 Ah | 349 × 175 × 290 | right | 37.8 kg |
| Q-Battery 12DC-150 | 150 Ah | 328 × 180 × 276 | – | 37.5 kg |
| Q-Battery 12SEM-120 | 120 Ah | 347 × 175 × 234 | right | 29.9 kg |

- Q-Battery 12DC-150: 15 Ah more, a different case (328 × 180 × 276 mm).
- Q-Battery 12SEM-120: 15 Ah less, a different case (347 × 175 × 234 mm).

## Lead-acid technology in the 12SEM-135

Inside, the 12SEM-135 is classic lead-acid: liquid electrolyte and lead plates. It is a robust, well-known technology with a good capacity-to-price ratio, and still the basis of most cars, trucks and traction equipment.

## Before ordering the 12SEM-135, check this

- The 12SEM-135 needs 349 × 175 × 290 mm of space: measure it with the hold-down clamp in place.
- The 12SEM-135 has the positive terminal on the right: compare it with your current battery.
- Capacity of the 12SEM-135: 135 Ah; the same as your current battery or slightly more is fine.

## Part numbers and codes for the Q-Battery 12SEM-135

Shops, garages and catalogues identify the 12SEM-135 with these codes:

| Commercial reference | 12SEM-135 |
|---|---|
| EAN | 4250889600273 |
| Terminal type | A-Pole |
| Not to be confused with | Q-Battery 12SEM-105 (105 Ah), Q-Battery 12SEM-137 (137 Ah) |

## Frequently asked questions about the Q-Battery 12SEM-135

### 12SEM-135 or 12DC-150: which one suits me?

Compared with the 12SEM-135, the Q-Battery 12DC-150 has 15 Ah more. With 150 Ah, the 12DC-150 runs longer between charges than the 12SEM-135 (135 Ah). Mind the space: the 12DC-150 measures 328 × 180 × 276 mm.

### How much does the Q-Battery 12SEM-135 weigh?

37.8 kg, with 135 Ah of capacity. For reference, the Q-Battery 12DC-150 (150 Ah) weighs 37.5 kg.

### Which side is the positive terminal on the Q-Battery 12SEM-135?

On the 12SEM-135, the positive terminal is on the right with the terminals facing you: compare it with your current battery, because with reversed polarity the cables will not reach.

### Which charger does the Q-Battery 12SEM-135 need?

An automatic lead-acid charger with cut-off or maintenance mode, rated at 10 to 20% of its capacity in amps. If it is a vented type, check the electrolyte level and top up only with distilled water.

## Keep comparing: alternatives to the 12SEM-135

- [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)

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