# Auxiliary battery Deta DK091 12V 9Ah 120A AGM ![Auxiliary battery Deta DK091 12V 9Ah 120A AGM](https://baterias.com/3618-home_default/battery-deta-dk091-12v-9ah-120a.jpg) > Deta DK091 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) → [Deta](https://baterias.com/gb/deta) - **Canonical URL**: https://baterias.com/gb/battery-deta-dk091-12v-9ah-120a - **Language**: en-GB - **Brand**: Deta - **Reference**: BCOM-DETA-DK091 - **EAN**: 3661024026338 - **MPN**: DK091 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | DETA | | Reference | DK091 | | Model | DETA Start-Stop Auxiliary | | Voltaje | 12 V | | Largo | 150 mm | | Ancho | 90 mm | | Alto | 105 mm | | Peso | 3.1 kg | | Tecnología | AGM | | EAN | 3661024026338 | | Scheme | Positive terminal on the left | | Terminal | M12 | | Subjection | B00 | | Arranque en frío CCA EN | 120 A | | Capacidad C20 (Ah) | 9 Ah (c20) | | Box Type | C54 | ## Quick description **Deta DK091 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 DETA Start-Stop Auxiliary ## Description ## Battery Deta DK091 9Ah 120A 12V The Battery DETA DK091 9Ah 120A 12V Start-Stop Auxiliary belongs to the Deta Start-Stop Auxiliary batteries range. With this range, Deta offers us batteries that have been designed from their previous experience as car manufacturers.Deta 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 DETA DK091 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 Deta 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, dethe 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. ### Before buying your Deta battery - **Understand your needs**: Determine the type of battery you need according to your vehicle or device.Consider the required capacity, voltage and size - **Investigate the available options**: Investigate different brands and types of batteries to find the one that best suits your needs and budget - **Check the specifications:**Be sure to carefully review the technical specifications of the battery, such as capacity, type of chemistry, dimensions and compatibility with your vehicle - **Terminals:**Check that the scheme and position of the terminal of your new battery are identical to the values of the old model The Battery DETA DK091 9Ah 120A 12V Start-Stop Auxiliary has been designed by Deta with the highest standards of ilrity Deta is synonym for innovation, quality and exceptional service.These fundamental values are those that have driven them to be leaders in the sector both in Germany and throughout Europe Deta is a brand that belongs to Exide Technologies. ### Deta batteries, always an excellent option - Batteries with German technology - Greater starter power - Greater shelf life - Mark with wide batteries Catalago for tourism and industrial vehicles If you want additional information about Battery Deta DK091, you can download the product's technical sheet at the following link: [ Download technical sheet Deta DK091 9Ah 120A 12V](/fichastecnicas/datasheet-battery-deta-dk091-9ah-120a-12v.pdf) ## Frequently asked questions ### Is the DK091 model AGM? What does this technology offer? Yes. The DK091 from Deta 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 this battery compatible with Start-Stop systems? 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 verify this battery is the right one? 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 DK091; 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 Deta DK091 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. ### What is the warranty period of this battery? We provide 2 years of official manufacturer warranty against manufacturing defects. It covers cell failures, internal short-circuits and abnormal capacity drops. Wear from misuse (prolonged overcharging, wrong charger or faulty alternator) is not covered. On confirmed defect after technical inspection, we replace the DK091 model at no cost. ### When will I receive the DK091 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. ### Can I return the Deta DK091 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. ### Where can I buy the Deta DK091 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. ### What is the service life of the DK091 model? Expected lifespan of the Deta DK091 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 dimensions of the Deta DK091 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. ### What is the weight of the DK091 model? 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 Deta DK091 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. ### Is the DK091 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 DK091 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which interchangeable batteries are there for this one? 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. ### Is the DK091 model better than its equivalents from other brands? 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 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 11,063+ 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 Deta DK091 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 Deta DK091 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Is there anything to do after replacing a Start-Stop battery? 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 Deta DK091 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) - [EXIDE EK091](https://baterias.com/gb/battery-exide-ek091-12v-9ah-120a) ## 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 · 2026-08-10*