# Auxiliary battery Exide EK111 12V 11Ah 150A AGM ![Auxiliary battery Exide EK111 12V 11Ah 150A AGM](https://baterias.com/5585-home_default/battery-exide-ek111-12v-11ah-150a.jpg) > Exide EK111 auxiliary battery 12V 11Ah 150A AGM. Start-Stop Auxiliary range. Dimensions 150×90×130 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-ek111-12v-11ah-150a - **Language**: en-GB - **Brand**: EXIDE - **Reference**: BCOM-EXIDE-EK111 - **EAN**: 3661024036580 - **MPN**: EK111 - **Price**: 33,60 € - **Stock**: In stock ## Technical specifications | Feature | Value | |---|---| | Brand | EXIDE | | Reference | EK111 | | Model | EXIDE AUXILIAR | | Voltage (V) | 12 V | | Largo | 150 cm | | Ancho | 90 cm | | Alto | 130 cm | | Peso | 3.9 kg | | Tecnología | AGM | | EAN | 3661024036580 | | Terminal layout | Positive terminal on the left | | Terminal type | M04 | | Hold down | B0 | | Cold cranking amps (EN) | 150 A | | Capacity (C20) | 11 Ah (c20) | ## Quick description **Exide EK111 12V 11Ah 150A** 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 11 Ah C20 🔋 Cold cranking 150 A EN-1 📏 Dimensions 150×90×130 mm ⚙️ Technology AGM 🧭 Polarity Positive on the left ⚖️ Weight 3,9 kg 🏷️ Model EXIDE Start-Stop Auxiliary ## Description ## Auxiliary battery Exide EK111 Auxiliar 11Ah 150A 12V 12*V* Voltage 11*Ah* Capacity 150*A* Cold cranking 3.90*kg* Weight The **Exide EK111** with AGM technology is the **11 Ah**, **12 V** support battery for the auxiliary network of cars with advanced Start-Stop and heavy electronics. It measures 150 × 90 × 130 mm and the positive terminal on the left, the format sought by anyone replacing a 11 Ah battery in vehicles with an auxiliary battery. - Maintenance-free. - Sealed AGM: safe when installed in the cabin. - Stabilises the onboard network voltage. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. ### Vehicles compatible with the Exide EK111 The Exide EK111 is compatible with more than 88 vehicles: it is fitted as original equipment or as a replacement by brands such as Mercedes-Benz, BMW, Audi, Volvo, Citroën and Alpina. It is a go-to option when you need a **battery for a Mercedes-Benz**, BMW or other models that use this same format. In our database it is cross-referenced against 8 original-equipment part numbers, which gives an idea of its real coverage. ### The Exide EK111: Auxiliar range and AGM technology The EK111 is part of the Exide **Auxiliar** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery. ### Will it fit your current battery tray? The Exide EK111 is made in the 150 × 90 × 130 mm format and weighs 3.90 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 M04 terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change. ### What Exide does differently 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. We guarantee that every Exide arrives new, charged and with the manufacturer's full warranty. ### Care and maintenance Replace it with the same technology and capacity as the original. The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both. ### Manufacturer's warranty The Exide EK111 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. ### When you get it and how to return it Order **before [[ks:cutoff]]** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **[[ks:return_days]] days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email. ## Frequently asked questions ### Is this battery AGM? What is it for? Yes. The EK111 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 EK111 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 is the Exide EK111 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 our blog. 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 — with positive on the left 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 EK111 battery last? Expected lifespan of the Exide EK111 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 EK111 battery? Dimensions (length × width × height) are 150×90×130 mm — also written as 150x90x130 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 polarity does the Exide EK111 battery have? Polarity: positive on the left. To identify it, place the battery in front of you with the terminals facing you and check which side the positive (+, marked with a red ring) is on. Before buying, verify the polarity matches your current battery: switching polarity forces longer cables or system reconfiguration, with short-circuit risk. ### Will the Exide EK111 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 EK111 fits 88 verified vehicle versions in our database. ### Which batteries are equivalent to the Exide EK111? 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 EK111 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 EK111 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 EK111 ships factory-charged at 80-90% so you can use it straight after fitting. ## Compatible vehicles This battery fits 88 vehicles. 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