# Auxiliary battery Kronobat AUX9 12V 9Ah 130A AGM ![Auxiliary battery Kronobat AUX9 12V 9Ah 130A AGM](https://baterias.com/3352-home_default/best-price-battery-12v-9ah-agm-aux9.jpg) > Kronobat AUX9 auxiliary battery 12V 9Ah 130A AGM. AUXILIAR range. Dimensions 151×87×106 mm, + terminal on the left. Check fitment by plate. **Category:** [Auxiliary Batteries](https://baterias.com/gb/auxiliary-batteries) → [KRONOBAT](https://baterias.com/gb/kronobat) - **Canonical URL**: https://baterias.com/gb/best-price-battery-12v-9ah-agm-aux9 - **Language**: en-GB - **Brand**: KRONOBAT - **Reference**: BCOM-KRONOBAT-AUX9 - **MPN**: AUX9 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Reference | AUX9 | | Model | AUXILIAR | | Voltaje | 12 V | | Largo | 151 mm | | Ancho | 87 mm | | Alto | 106 mm | | Peso | 2.87 kg | | Tecnología | AGM | | Scheme | Positive terminal on the left | | Terminal | Y4 | | Arranque en frío CCA EN | 130 A | | Capacidad C20 (Ah) | 9 Ah (c20) | ## Quick description **Kronobat AUX9 12V 9Ah 130A** 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 130 A EN-1 📏 Dimensions 151×87×106 mm ⚙️ Technology AGM 🧭 Polarity Positivo a la izquierda ⚖️ Weight 2,87 kg 🏷️ Model AUXILIAR ## Description ## Battery Kronobat AUX9 9Ah 130A 12V The Battery KRONOBAT AUX9 9Ah 130A 12V AUXILIAR belongs to the Kronobat Auxiliary range High -tech cars demand considerable electricity supply, so these vehicles, equipped with combustion engines, usually incorporate two types of batteries: a conventional 12 volts for starting and an additional auxiliary battery.Kronobat's auxiliary batteries ensure optimal performance in comfort benefits, security devices and fuel savings functions. ### Ideal for: - Vehicles that require support applications ### Battery advantages and characteristics KRONOBAT AUX9 9Ah 130A 12V - Increase the duration of the START-STOP system - Ideal to maintain comfort functions at the motor start - Designed with the highest standards of ilaity for the best brand in the sector - It does not require maintenance ### How to find the right battery for your vehicle? We know that you will have doubts about which battery is better for your vehicle or device, there is a lot of variety of products and brands to chooseLooking for batteries for standard vehicles, batteries for high-end cars with Start-Stop systems or boat batteries, Kronobat batteries are an excellent option. Kronobat products have the same characteristics of reliability, resistance, manufacturing materials and power as the high range of first brands but at much lower prices.Not only for the price of the battery, but because the Kronobat batteries as many with the same benefits and characteristics as the first brand batteries such as Varta, Exide etc. On our website you will find a complete and varied catalog to meet the electrical demands of any type vehicle, if you do not find the battery that needs or have doubts about which battery, do not hesitate to contact us. **We inform you that, due to the high demand for this type of products, if there was a case that we do not have due to lack of stock of the Kronobat battery you have acquired, a battery will be sent with the same benefits even if it is from anotherWhite brand.In case of not having a similar white brand battery, it will be sent first brand.** ### Why choose a Kronobat battery? If you are looking for a while with great reliability but at a very economical price, Kronobat batteries are your best option.Kronobat offers products such as leading manufacturers in the sector but at more competitive prices, always maintaining the benefits of these first brands.So you can purchase a reliable product of excellent quality at a lower price. ### Know more about the Kronobat brand The Kronobat brand batteries present the same characteristics and benefits as brands such as Varta, Long, Exide and others.Vibrations resistant, long shelf life and high standards of while but at even cheaper prices. When choosing Kronobat, he will choose great boot power, excellent manufacturing materials and latest technology but without affecting his pocket.Kronobat is an exclusive brand that distributes first brand batteries at economic prices. Do not give up the quality for the price and obtain the battery equivalent to another of leading brands in the sector. ## Frequently asked questions ### Is this battery AGM? What is it for? Yes. The AUX9 from Kronobat 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 Kronobat AUX9 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 Kronobat AUX9 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 AUX9; 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 AUX9 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. ### How many years of warranty does the AUX9 model cover? This battery includes 2 years of official manufacturer warranty against manufacturing defects. It applies to defects such as damaged cells, internal short-circuits or abnormal capacity loss. Damage from misuse is excluded: prolonged overcharging, unsuitable chargers or a faulty alternator. Once the defect is verified by technical inspection, we replace the AUX9 at no cost. ### When will I receive the AUX9 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. ### Where can I buy the Kronobat AUX9 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 many years does this battery last? Expected lifespan of the Kronobat AUX9 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 Kronobat AUX9 battery? Dimensions (length × width × height) are 151×87×106 mm — also written as 151x87x106 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 AUX9 model? It weighs 2,9 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 Ah and CCA does this battery have? Nominal capacity 9 Ah[?cca: and [cold-cranking amps 130 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 AUX9 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 AUX9 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### Which batteries are equivalent to the Kronobat AUX9? 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: Kronobat AUX9 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 reviews does the AUX9 model have? 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 11,624+ 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 Kronobat AUX9 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 Kronobat AUX9 is fully original and meets European EN 50342-6 standards for advanced Start-Stop. ### Will my car recognise the new battery automatically? 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 Kronobat AUX9 ships factory-charged at 80-90% so you can use it straight after fitting. ## 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 · 2026-09-16*