# Caravan battery Q-battery 12SEM-135 12V 135Ah ![Caravan battery Q-battery 12SEM-135 12V 135Ah](https://baterias.com/1536-home_default/battery-q-battery-12sem-135-12v-135ah.jpg) > Q-battery 12SEM-135 caravan battery 12V 135Ah. SEMITRACTION BATTERY range. Dimensions 349×175×290 mm, + terminal on the right. For your on-board services. **Category:** [Mobility Vehicle Batteries](https://baterias.com/gb/batteries-for-mobility-vehicles) → [Q-battery](https://baterias.com/gb/q-battery) - **Canonical URL**: https://baterias.com/gb/battery-q-battery-12sem-135-12v-135ah - **Language**: en-GB - **Brand**: Q-battery - **Reference**: BCOM-Q-BATTERY-12SEM-135 - **EAN**: 4250889600273 - **MPN**: 12SEM-135 - **Price**: 279,20 € - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | Q-Battery | | Reference | 12 SEM-135 | | Model | SEMITRACTION BATTERY | | Voltage (V) | 12 V | | Largo | 349 cm | | Ancho | 175 cm | | Alto | 290 cm | | Peso | 37.8 kg | | Tecnología | Lead-acid | | Terminal layout | Positive terminal on the right | | Terminal type | A-Pole | | Hold down | B0 | | Capacity (C20) | 135 Ah (c20) | ## Quick description **Q-battery 12SEM-135 12V 135Ah** is a leisure battery for campers, motorhomes and caravans. Designed to power the entire interior kit (fridge, heater, water pump, USB, LED lighting) for several days off-grid, with no need to plug into a campsite hookup. ### Why this caravan battery? - **Real off-grid autonomy** no campsite hookup needed - **Lasts the whole season** handles daily discharges without capacity loss - **Powers it all at once** fridge, water pump, LED and USB without issues 🔌 Voltage 12 V ⚡ Capacity 135 Ah C20 📏 Dimensions 349×175×290 mm ⚙️ Technology Lead-acid 🧭 Polarity Positive on the right ⚖️ Weight 37,8 kg 🏷️ Model SEMITRACTION BATTERY ## Description ## Mobility battery Q-Battery 12SEM-135 Semitraction Battery 135Ah 12V 12*V* Voltage 135*Ah* Capacity 37.80*kg* Weight The **Q-Battery 12SEM-135** with conventional lead-acid technology delivers **135 Ah** at **12 V** with the cycle life that power wheelchairs, mobility scooters and light electric vehicles demand. Its 349 × 175 × 290 mm and the positive terminal on the right make it the exact replacement for the 135 Ah battery fitted as standard to many power wheelchairs and mobility scooters. - Sealed AGM/GEL: safe indoors and in transport. - Good balance of capacity, cranking power and price. - Approved for air and sea transport (VRLA). - No maintenance, no water top-ups. ### What the Q-Battery 12SEM-135 is for The Q-Battery 12SEM-135 is designed for power wheelchairs, mobility scooters and light electric vehicles. Wheelchairs and scooters normally use two identical batteries in series: replace them together. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 37.80 kg, A-Pole terminals and B0 hold-down. ### Size, terminals and hold-down of the Q-Battery 12SEM-135 It has external dimensions of 349 × 175 × 290 mm and weighs 37.80 kg. The positive terminal on the right decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses a B0 hold-down and A-Pole terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change. ### The Q-Battery 12SEM-135: Semitraction Battery range and conventional lead-acid technology The 12SEM-135 is part of the Q-Battery **Semitraction Battery** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. The conventional lead-acid battery remains the most widespread technology thanks to its balance of capacity, cranking current and price. Well maintained and kept charged, it offers years of reliable service in vehicles without Start-Stop. ### What Q-Battery does differently Q-Battery specialises in AGM and GEL VRLA batteries for UPS, telecoms, solar and deep cycling, with long-life and tubular-plate series for industrial use. We guarantee that every Q-Battery arrives new, charged and with the manufacturer's full warranty. ### Warranty and coverage The Q-Battery 12SEM-135 comes with the **manufacturer's official warranty** against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you. ### Care and maintenance Recharge the wheelchair or scooter after each use and do not leave it discharged for days: lead sulphates and loses capacity. On batteries with filler caps, check the electrolyte level and top up only with distilled water. ### When you get it and how to return it Order **before [[ks:cutoff]]** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **[[ks:return_days]] days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email. ## Frequently asked questions ### How do I change this battery step by step? In most devices it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On devices with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How long does the Q-battery 12SEM-135 battery last? Expected lifespan of the Q-battery 12SEM-135 is 4 to 6 years in regular device use without Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured. ### What are the dimensions of the Q-battery 12SEM-135 battery? Dimensions (length × width × height) are 349×175×290 mm — also written as 349x175x290 mm — following the European DIN standard. Always measure the space in your device before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### Which batteries are equivalent to the Q-battery 12SEM-135? Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop devices. See the "Equivalents" section to view recommended options at the same performance level. ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — over 25 years of experience validating automotive batteries. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-09-29*