# Auxiliary battery Exide EK151 12V 15Ah 200A AGM ![Auxiliary battery Exide EK151 12V 15Ah 200A AGM](https://baterias.com/5591-home_default/battery-exide-ek151-12v-15ah-200a.jpg) > Exide EK151 auxiliary battery 12V 15Ah 200A AGM. Start-Stop Auxiliary range. Dimensions 150×90×145 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-ek151-12v-15ah-200a - **Language**: en-GB - **Brand**: EXIDE - **Reference**: BCOM-EXIDE-EK151 - **EAN**: 3661024036597 - **MPN**: EK151 - **Price**: 54,60 € - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | EXIDE | | Reference | EK151 | | Model | EXIDE AUXILIAR | | Voltage (V) | 12 V | | Largo | 150 cm | | Ancho | 90 cm | | Alto | 145 cm | | Peso | 4.8 kg | | Tecnología | AGM | | EAN | 3661024036597 | | Terminal layout | Positive terminal on the left | | Terminal type | Thin terminals | | Hold down | B0 | | Cold cranking amps (EN) | 200 A | | Capacity (C20) | 15 Ah (c20) | ## Quick description **Exide EK151 12V 15Ah 200A** 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 15 Ah C20 🔋 Cold cranking 200 A EN-1 📏 Dimensions 150×90×145 mm ⚙️ Technology AGM 🧭 Polarity Positive on the left ⚖️ Weight 4,8 kg 🏷️ Model EXIDE Start-Stop Auxiliary ## Description ## Auxiliary battery Exide EK151 Auxiliar 15Ah 200A 12V 12*V* Voltage 15*Ah* Capacity 200*A* Cold cranking 4.80*kg* Weight Designed for the auxiliary network of cars with advanced Start-Stop and heavy electronics, the **Exide EK151** from the **Auxiliar** range stabilises the voltage with **15 Ah** with AGM technology. Its 150 × 90 × 145 mm and the positive terminal on the left make it the exact replacement for the 15 Ah battery fitted as standard to many vehicles with an auxiliary battery. - Protects the main battery and the alternator. - AGM: faster recharging and better cycle resistance than a conventional battery. - Direct replacement for the original auxiliary battery. - Supports advanced Start-Stop systems. ### What the Exide EK151 is for The Exide EK151 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. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 4.80 kg, Bornes fines terminals and B0 hold-down. ### Size, terminals and hold-down of the Exide EK151 The Exide EK151 is made in the 150 × 90 × 145 mm format and weighs 4.80 kg. 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. It uses a B0 hold-down and Bornes fines terminals, the system that anchors and connects it in the vehicle. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters. ### The Exide EK151: Auxiliar range and AGM technology Within the Exide catalogue, the **Auxiliar** series groups the references designed for this use. The EK151 is the 15 Ah model of that family, with the same performance as its siblings in other sizes. AGM means the acid is held in a glass mat instead of floating free. That is why the battery can be installed in the cabin without gases, survives more cycles and recovers its charge quickly. ### Exide: the maker behind the EK151 Exide is one of the world's largest battery manufacturers and an original-equipment supplier to many car makers. Its European plants produce starter, industrial and leisure batteries under original-equipment quality controls. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### Warranty and coverage The Exide EK151 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. ### Usage and maintenance tips The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. ### Shipping, delivery and returns 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 ### Is the Exide EK151 an AGM battery and what are the benefits of AGM? Yes. The EK151 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 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 change this battery step by step? 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 long does the Exide EK151 battery last? Expected lifespan of the Exide EK151 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 Exide EK151 battery? Dimensions (length × width × height) are 150×90×145 mm — also written as 150x90x145 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. ### Will the Exide EK151 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 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The EK151 typically fits a wide range of European vehicles thanks to its standard DIN case format. ### What are the equivalents of the EK151 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. ### What advantages does the Exide EK151 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 Exide EK151 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 Exide EK151 ships factory-charged at 80-90% so you can use it straight after fitting. ## Equivalent batteries - [TUDOR TK151](https://baterias.com/gb/battery-tudor-tk151-15ah-200a) ## Reviews - **Average rating**: 4.77 / 5 (35 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 · 2026-09-29*