# Caravan battery Q-battery 12SEM-137 12V 137Ah ![Caravan battery Q-battery 12SEM-137 12V 137Ah](https://baterias.com/1539-home_default/battery-q-battery-12sem-137-12v-137ah.jpg) > Q-battery 12SEM-137 caravan battery 12V 137Ah. SEMITRACTION BATTERY range. Dimensions 513×189×223 mm, + terminal on the left. 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-137-12v-137ah - **Language**: en-GB - **Brand**: Q-battery - **Reference**: BCOM-Q-BATTERY-12SEM-137 - **MPN**: 12SEM-137 - **Price**: 364,70 € - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | Q-Battery | | Reference | 12 SEM-137 | | Model | SEMITRACTION BATTERY | | Voltage (V) | 12 V | | Largo | 513 cm | | Ancho | 189 cm | | Alto | 223 cm | | Peso | 37.4 kg | | Tecnología | Lead-acid | | Terminal layout | Positive terminal on the left | | Terminal type | A-Pole | | Hold down | B0 | | Capacity (C20) | 137 Ah (c20) | ## Quick description **Q-battery 12SEM-137 12V 137Ah** 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 137 Ah C20 📏 Dimensions 513×189×223 mm ⚙️ Technology Lead-acid 🧭 Polarity Positive on the left ⚖️ Weight 37,4 kg 🏷️ Model SEMITRACTION BATTERY ## Description ## Mobility battery Q-Battery 12SEM-137 Semitraction Battery 137Ah 12V 12*V* Voltage 137*Ah* Capacity 37.40*kg* Weight Designed for power wheelchairs, mobility scooters and light electric vehicles, the **Q-Battery 12SEM-137** from the **Semitraction Battery** range offers **137 Ah** of deep-cycle capacity with conventional lead-acid technology. Its 513 × 189 × 223 mm and the positive terminal on the left make it the exact replacement for the 137 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-137 is for With 137 Ah, the Q-Battery 12SEM-137 offers the daily range that power wheelchairs, mobility scooters and light electric vehicles need, with a sealed construction that is safe indoors. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 37.40 kg, A-Pole terminals and B0 hold-down. ### The Q-Battery 12SEM-137: Semitraction Battery range and conventional lead-acid technology Within the Q-Battery catalogue, the **Semitraction Battery** series groups the references designed for this use. The 12SEM-137 is the 137 Ah model of that family, with the same performance as its siblings in other sizes. 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. ### Will it fit your current battery tray? In terms of format, the Q-Battery 12SEM-137 measures 513 × 189 × 223 mm (length × width × height) and weighs 37.40 kg. The positive terminal on the left 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. ### Q-Battery: the maker behind the 12SEM-137 The Q-Battery catalogue runs from small alarm batteries to large traction monoblocs, always with sealed, maintenance-free technology. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### How to make it last longer Use the original charger or one compatible with the battery technology (AGM/GEL) and always replace both batteries in the set together. On batteries with filler caps, check the electrolyte level and top up only with distilled water. ### Manufacturer's warranty The Q-Battery 12SEM-137 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. ### Shipping, delivery and returns Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email. ## Frequently asked questions ### How do I fit the 12SEM-137 model in my device? 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 our blog. 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 — with positive on the left 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. ### What is the service life of the 12SEM-137 model? Expected lifespan of the Q-battery 12SEM-137 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-137 battery? Dimensions (length × width × height) are 513×189×223 mm — also written as 513x189x223 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. ### On which side is the positive of the 12SEM-137 model? Polarity: positive on the left. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk. ### Which batteries are equivalent to the Q-battery 12SEM-137? 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 — automotive battery specialists since 2012. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-10-19*