# Auxiliary battery Exide EK091 12V 9Ah 120A AGM ![Auxiliary battery Exide EK091 12V 9Ah 120A AGM](https://baterias.com/5581-home_default/battery-exide-ek091-12v-9ah-120a.jpg) > Exide EK091 auxiliary battery 12V 9Ah 120A AGM. Start-Stop Auxiliary range. Dimensions 150×90×105 mm, + terminal on the left. Check fitment by plate. **Category:** [Auxiliary Batteries](https://baterias.com/gb/auxiliary-batteries) → [EXIDE](https://baterias.com/gb/exide) - **Canonical URL**: https://baterias.com/gb/battery-exide-ek091-12v-9ah-120a - **Language**: en-GB - **Brand**: EXIDE - **Reference**: BCOM-EXIDE-EK091 - **EAN**: 3661024036573 - **MPN**: EK091 - **Price**: 54,72 € - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | EXIDE | | Reference | EK091 | | Model | EXIDE AUXILIAR | | Voltaje | 12 V | | Largo | 150 cm | | Ancho | 90 cm | | Alto | 105 cm | | Peso | 3.1 kg | | Tecnología | AGM | | EAN | 3661024036573 | | Scheme | Positive terminal on the left | | Terminal | M12 | | Subjection | B0 | | Arranque en frío CCA EN | 120 A | | Capacidad C20 (Ah) | 9 Ah (c20) | ## Quick description **Exide EK091 12V 9Ah 120A** 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 🔌 Voltage 12 V ⚡ Capacity 9 Ah C20 🔋 Cold cranking 120 A EN-1 📏 Dimensions 150×90×105 mm ⚙️ Technology AGM 🧭 Polarity Positivo a la izquierda ⚖️ Weight 3,1 kg 🏷️ Model EXIDE Start-Stop Auxiliary ## Description ## Battery Exide EK091 9Ah 120A 12V The Battery EXIDE EK091 9Ah 120A 12V AUXILIAR belongs to the Auxiliary Exide batteries range.Exide offers us this range of batteries designed from its previous experience as car manufacturers. Auxiliary exide batteries are ideal for vehicles with stop and start systems (Start-Stop) since they drive the electrical equipment and serve as a complement to the main start battery. ### Ideal for: - Start-Stop vehicles ### Battery advantages and characteristics EXIDE EK091 9Ah 120A 12V - Guarantees that comfort benefits, security devices and fuel savings functions work perfectly - It supports deep discharges, which makes it ideal for the continuous starts of a Start-Stop - Vrla technology - Ideal for use in city - More resistant than a conventional battery - Long duration, even stored ### How to find the right battery for your vehicle? In recent years, there has been an increase of almost 300% in the energy needs of vehicles.To select the appropriate battery, it is essential to consider not only the power and displacement of the engine, but also the equipment, the climate and the usual driving style. The wide range of exide batteries offers a complete and varied catalog to meet the electrical demands of any vehicle. From small and simple gasoline engines to large and robust industrial engines, exide batteries guarantee a reliable and safe start. If you do not find the battery you need or have doubts about which battery, do not hesitate to contact us. ### Why choose an exide battery? Exide is a global leading brand in the manufacture and marketing of batteries, with the "manufactured in Europe" seal represents the latest technology and the most demanding quality standard, both for the replacement market and for the first team. ### Know more about the exide brand Exide manufactures high performance batteries for all types of vehicles and machinery.Their batteries are designed to cover and respond to the maximum demands for all types of applications. They use more advanced components and materials being recognized for their viability and durability because it is one of the world's largest producers and recycling of the world's lead-acid batteries. The main vehicle manufacturers trust exide as a provider of first equipment as the company develops and manufactures state -of -the -art solutions for both energy storage, industrial applications and automocyon applications. ## Frequently asked questions ### Is this battery AGM? What is it for? Yes. The EK091 from Exide uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for cars with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### Is the EK091 model suitable for Start-Stop cars? Yes. As AGM technology it is designed for Start-Stop vehicles. AGM batteries support advanced Start-Stop and regenerative braking thanks to their higher cycle count. EFB is recommended for basic Start-Stop; AGM is recommended when regenerative braking is also present, thanks to its higher cycle capability. It works straight out of the box — on most modern vehicles registering the battery via OBD is recommended so the alternator automatically applies the optimal charging profile. ### How do I check that the Exide EK091 battery fits my vehicle? Three ways: 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 for the EK091; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 9:00–18:00 CET). ### How is the Exide EK091 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 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 cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How many years of warranty does the EK091 model cover? The official manufacturer warranty is 2 years and covers manufacturing defects. It covers cell failures, internal short-circuits and abnormal capacity drops. It does NOT cover misuse (prolonged overcharging, inadequate charger, defective alternator). On confirmed defect after technical inspection, we replace the EK091 model at no cost. ### How long does Exide EK091 delivery take? In mainland Spain and Portugal it arrives in 24 h if you order before 17:00 and the battery is in stock — it leaves the same day and arrives the next business day. Afternoon or weekend orders ship the next business day. For Balearics, Canaries and other EU destinations, allow 2-5 days. Shipping cost is calculated in the cart based on destination and service (standard, express, cash on delivery). Tracking number is sent by email + SMS as soon as the parcel ships. ### Can I return the Exide EK091 battery if it doesn't fit or doesn't work? Yes. You have 14 days from delivery to return it. In mainland Spain and Portugal returns are FREE — we cover the return shipping cost via prepaid label. In other EU countries the return shipping cost is the customer's. It must arrive in its original packaging with no signs of installation. If it was defective, the warranty covers replacement even after the 14-day period. ### How much does the Exide EK091 battery cost? The current price at baterias.com is 54,72 € (VAT included; 45,22 € excl. VAT), updated every 24 hours. The applicable VAT may vary with the destination country and is confirmed in the cart. Shipping cost is calculated in the cart based on destination and chosen service (standard, express, cash on delivery). ### Where do I find the EK091 model online? At baterias.com — authorised distributor with real stock, 24h delivery in mainland Spain and Portugal if you order before 17:00, and full manufacturer warranty. Shipping cost is calculated in the cart based on destination and chosen service (standard, express, cash on delivery). Secure payment by card, Bizum, PayPal or bank transfer. If you choose at-home installation, our technician will take the used battery and dispose of it through an authorised collection point. ### What is the service life of the EK091 model? Expected lifespan of the Exide EK091 is 5 to 8 years in mild-climate car use with 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 measurements of the EK091 model? Dimensions (length × width × height) are 150×90×105 mm — also written as 150x90x105 mm — 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. ### How much does the Exide EK091 battery weigh? It weighs 3,1 kg. Most of the weight is lead. If you plan to fit it yourself, use gloves and a carrying strap (AGM batteries are slightly heavier than conventional due to the absorbent glass-mat fibre). ### How many amps does the Exide EK091 battery have? Nominal capacity 9 Ah[?cca: and [cold-cranking amps 120 A]] at 12 V. Ah measure the total energy available (autonomy); CCA (also written A in cold or EN under the European standard) measure the instantaneous power to crank the starter motor. A battery with more CCA starts better in winter; one with more Ah keeps accessories on for longer. ### Does this 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 — we reply during business hours (Mon–Fri 9:00–18:00 CET). The EK091 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Exide EK091? 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 cars. See the "Equivalents" section to view recommended options at the same performance level. ### Which is better: Exide EK091 or an alternative from another brand? This battery and its equivalents from Bosch, Tudor or Exide are technically comparable: same dimensions, same voltage and same capacity. The differences are warranty (Varta and Bosch: 2 years; Tudor and Exide: 2 years on the equivalent line), manufacturing plant (Varta and Bosch share origin in the Clarios Group; Tudor and Exide belong to Exide Technologies) and price. For private use any of these brands will give 4-6 years of life. Compare them in the "Equivalents" section. ### What do users say about the Exide EK091 battery? The average rating of the Exide EK091 on baterias.com is 4.81/5 from 25 verified customer reviews. The product rating, when available, is shown on the product page next to the stars. You can also check our public Trustpilot profile at shop level (4.5/5 from 11,057+ verified reviews). Most-praised points: reliable cold start, lifespan above 5 years and fast delivery; most common complaints mention BMS-equipped cars that need OBD registration after fitting. ### When do I need an AGM battery like this one? AGM (Absorbent Glass Mat) technology uses absorbent fibreglass that retains the electrolyte, eliminating leaks and allowing up to 3× more charge/discharge cycles than a conventional battery. It is the recommended option when the car has advanced Start-Stop with regenerative braking (BMW EfficientDynamics, Mercedes Eco, Audi MHEV, Land Rover ECO, Volvo i-Stop). Withstands tilted positions, high vibration and extreme temperatures better than EFB. The Exide EK091 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Do I need to register the Exide EK091 on the car after installation? On most cars it is not strictly necessary — the alternator detects the new battery and adapts the charge automatically. It is recommended to register the battery via OBD so that the alternator applies the optimal charging profile from the first minute and extends the battery life as much as possible (especially on brands with sophisticated BMS: BMW, Mercedes, Audi, Volvo, Land Rover). Any workshop with an OBD scanner (~10-15 € labour) does it in 5 minutes. DIY apps: VCDS / Carista (VAG), Bimmercode (BMW), iCarsoft. If you do not register, the car will still start correctly — the alternator just takes a few days to adjust the profile. The Exide EK091 ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [TUDOR TK091](https://baterias.com/gb/battery-tudor-tk091-9ah-120a) ## Reviews - **Average rating**: 4.81 / 5 (25 reviews) ## 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 · 2026-08-09*