# Auxiliary battery Fulbat AUX14 12V 12.6Ah AGM ![Auxiliary battery Fulbat AUX14 12V 12.6Ah AGM](https://baterias.com/6487-home_default/battery-fulbat-aux14-12v-12-6ah.jpg) > Fulbat AUX14 auxiliary battery 12V 12.6Ah AGM. Auxiliary AGM range. Dimensions 150Γ—87Γ—145 mm, + terminal on the left. Check fitment by plate. **Category:** [Auxiliary Batteries](https://baterias.com/gb/auxiliary-batteries) β†’ [FULBAT](https://baterias.com/gb/fulbat) - **Canonical URL**: https://baterias.com/gb/battery-fulbat-aux14-12v-12-6ah - **Language**: en-GB - **Brand**: FULBAT - **Reference**: BCOM-FULBAT-AUX14 - **MPN**: AUX14 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | FULBAT | | Model | FULBAT Auxiliary AGM | | Voltage (V) | 12 V | | Largo | 150 mm | | Ancho | 87 mm | | Alto | 145 mm | | TecnologΓ­a | AGM | | Terminal layout | Positive left | | Capacity (C20) | 12.6 Ah | | Capacity (C10) | 12 Ah (c10) | ## Quick description **Fulbat AUX14 12V 12Ah** is an auxiliary battery: it supports the Start-Stop system and on-board electronics during stops, without draining the main battery. ## Why this auxiliary battery? - **Designed for Start-Stop** built for the intensive cycling of modern cars - **2 to 3 times longer life** vs fitting a cheap conventional battery - **Fast recovery** recharges in minutes once the engine is running πŸ”Œ Voltage 12 V ⚑ Capacity 12 Ah C20 πŸ“ Dimensions 150Γ—87Γ—145 mm βš™οΈ Technology AGM 🧭 Polarity Positive on the left 🏷️ Model FULBAT Auxiliary AGM ## Description ## Auxiliary battery Fulbat AUX14 12.6Ah 12V 12*V* Voltage 12.6*Ah* Capacity The **12 V**, **12.6 Ah** **Fulbat AUX14** auxiliary battery with AGM technology powers the auxiliary network of cars with advanced Start-Stop and heavy electronics. Its 150 Γ— 87 Γ— 145 mm and the positive terminal on the left make it the exact replacement for the 12.6 Ah battery fitted as standard to many vehicles with an auxiliary battery. - Direct replacement for the original auxiliary battery. - Supports advanced Start-Stop systems. - Protects the main battery and the alternator. - AGM: faster recharging and better cycle resistance than a conventional battery. ### Size, terminals and hold-down of the Fulbat AUX14 The Fulbat AUX14 is made in the 150 Γ— 87 Γ— 145 mm format. 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. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery. ### What the Fulbat AUX14 is for The Fulbat AUX14 is designed for the auxiliary network of cars with advanced Start-Stop and heavy electronics: it stabilises the voltage and protects the main battery in cars with heavy electronics. ### Technology inside the Fulbat AUX14 Fulbat builds the AUX14 to the same standards as the rest of its catalogue; what changes between references is capacity, format and terminal position. AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery. ### Fulbat: the maker behind the AUX14 French brand Fulbat is a European reference in motorcycle, garden and leisure batteries: compact ranges, clear JIS codes and a consistent quality that workshops know well. All the Fulbat batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Official warranty The Fulbat AUX14 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 Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both. ### When you get it and how to return it 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 is the Fulbat AUX14 battery installed in the vehicle? In most cars 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 (βˆ’) 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 β€” match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (βˆ’). On cars 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 AUX14 model? Expected lifespan of the Fulbat AUX14 is 4 to 7 years in regular use (depends on technology and climate). 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 size is this battery? Dimensions (length Γ— width Γ— height) are 150Γ—87Γ—145 mm β€” also written as 150x87x145 mm β€” following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### Will the Fulbat AUX14 battery fit my car? Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year β€” we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The AUX14 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Fulbat AUX14? 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 β€” an EFB cannot be replaced with a conventional battery in Start-Stop cars. 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 β€” automotive battery specialists since 2012. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-10-23*