# Auxiliary battery Tudor TK091 12V 9Ah 120A AGM ![Auxiliary battery Tudor TK091 12V 9Ah 120A AGM](https://baterias.com/962-home_default/battery-tudor-tk091-9ah-120a.jpg) > Tudor TK091 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) → [TUDOR](https://baterias.com/gb/tudor) - **Canonical URL**: https://baterias.com/gb/battery-tudor-tk091-9ah-120a - **Language**: en-GB - **Brand**: TUDOR - **Reference**: BCOM-TUDOR-TK091 - **EAN**: 3661024056557 - **MPN**: TK091 - **Price**: 61,07 € - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | TUDOR | | Reference | TK091 | | Model | TUDOR AUXILIAR | | Voltaje | 12 V | | Largo | 150 mm | | Ancho | 90 mm | | Alto | 105 mm | | Tecnología | AGM | | EAN | 3661024056557 | | Scheme | Positive terminal on the left | | Arranque en frío CCA EN | 120 A | | Capacidad C20 (Ah) | 9 Ah (c20) | ## Quick description **Tudor TK091 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 TUDOR Start-Stop Auxiliary ## Description ## Battery Tudor TK091 9Ah 120A 12V The battery TUDOR TK091 9Ah 120A 12V AUXILIAR belongs to the range of batteries of Tudor Auxiliary.Tudor offers us in this range of batteries designed from their previous experience as car manufacturers. Tudor auxiliary 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 TUDOR TK091 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 Tudor 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, Tudor 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 a tudor battery? Tudor batteries are manufactured by one of the leading groups in the manufacture of batteries worldwide: exide technologies that manufactures high performance batteries for all types of vehicles and machinery.Tudor ranges cover all existing applications, from cars, trucks, motorcycles, agricultural or marine and caravans. Tudor ranges, Tudor Strong Pro, Tudor Endurancepro, Tudor PowerPro and Startpro batteries to mention some, are high -performance batteries that will help and favor the operation of their vehicle or business. ### Know more about the Tudor brand Founded in Spain in 1897, Tudor batteries are a reference in the Spanish battery market.Tudor batteries are recognized for their constant innovation and market reliability. It currently belongs to the Exide Technologies group.With presence in more than 80 countries, Exide Technologies has logistics platforms, R&D laboratories and factories located in strategic locations in Europe, Asia and the United States. ## Frequently asked questions ### Is the Tudor TK091 an AGM battery and what are the benefits of AGM? Yes. The TK091 from Tudor 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 Tudor TK091 battery suitable for Start-Stop? 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 Tudor TK091 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 TK091; 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 do I fit the TK091 model in my car? 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. ### What warranty does the Tudor TK091 battery have? The official manufacturer warranty is 2 years and covers manufacturing defects. It applies to defects such as damaged cells, internal short-circuits or abnormal capacity loss. It does NOT cover misuse (prolonged overcharging, inadequate charger, defective alternator). Once the defect is verified by technical inspection, we replace the TK091 at no cost. ### When will I receive the TK091 model? 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. ### Are returns accepted on this battery? 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. ### What is the price of this battery? The current price at baterias.com is 61,07 € (VAT included; 50,47 € 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 can I buy the Tudor TK091 battery? 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. ### How long does the Tudor TK091 battery last? Expected lifespan of the Tudor TK091 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 size is this battery? 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 Tudor TK091 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). ### What is the capacity and CCA of the TK091 model? 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. ### Is the TK091 valid for my vehicle? 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 TK091 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the TK091 model? 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: Tudor TK091 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 real-world experiences are there with this battery? The average rating of the Tudor TK091 on baterias.com is 4.79/5 from 37 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 11,110+ 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. ### What advantages does the Tudor TK091 AGM battery offer over an EFB? 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 Tudor TK091 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Do I need to register the Tudor TK091 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 Tudor TK091 ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [EXIDE EK091](https://baterias.com/gb/battery-exide-ek091-12v-9ah-120a) ## Reviews - **Average rating**: 4.79 / 5 (37 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 · 2026-08-13*