The Exide Auxiliary battery series is designed for modern vehicles equipped with advanced electrical and technological systems. Auxiliary batteries are used in hybrid cars, start-stop vehicles, and premium models that require an additional power source for on-board systems such as multimedia, comfort electronics, and safety features. Unlike traditional starter batteries, auxiliary batteries do not serve as the primary source of power for the engine but are responsible for the stability of electronic systems, which is crucial in modern cars. The Exide EK091 model is a compact auxiliary battery with a capacity of 9 Ah and a maximum starting current of 120 A. Thanks to its small dimensions – 150 mm in length, 90 mm in width, and 105 mm in height – it is an ideal solution for installation in restricted vehicle spaces. This makes it a specialized unit primarily designed for specific vehicle models, most commonly found in premium brands such as BMW, Mercedes, and Audi. One notable feature of the EK091 model is its terminal layout 1, meaning that the positive terminal is located on the left side. This is a less common configuration compared to standard European batteries, so it is essential to verify compatibility with the vehicle before purchasing. Additionally, the battery is equipped with M12 terminals, which differ from the standard clamps used in conventional starter batteries. Another important aspect is the B0 mounting system, which means that the battery lacks a standard bottom hold-down fixture. This may require additional brackets or a dedicated mounting method in the vehicle. This is a less common setup compared to the B13 mounting system, which is widely used in European passenger cars. Auxiliary batteries like the Exide EK091 are a crucial component in modern vehicles that use advanced energy management systems. They help stabilize voltage and reduce the load on the main battery, which extends the lifespan of the entire electrical system. Their role is becoming increasingly important with the growing number of hybrid and electric vehicles, where efficient energy management is essential for vehicle operation. In summary, the Exide EK091 is a compact and efficient auxiliary battery that is perfect for modern vehicles with an advanced electrical system. With its small dimensions, specific terminal layout, and B0 mounting, it is dedicated to specific car models that require an additional power source for onboard electronics.