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The Exide Auxiliary series has been specifically designed to support the increasing number of auxiliary battery applications in modern vehicles. These batteries play a critical role in vehicles that require a secondary power source for various systems, such as electronics, comfort features, and start-stop functionality. In premium vehicles, particularly hybrids or high-end models from manufacturers like BMW, Mercedes-Benz, and Jaguar Land Rover, auxiliary batteries work alongside the main starter battery to handle auxiliary loads and support smoother start-stop transitions. Exide’s Auxiliary series is engineered with durability, compact size, and reliability in mind—ensuring that all onboard systems remain fully powered even when the engine is not running.

The Exide EK151 is a compact and efficient 12V auxiliary battery, designed for installation in space-restricted areas while still delivering robust power. With a capacity of 15 Ah and a cold cranking current of 200 A, this model is well-suited for powering essential systems such as ECUs, alarms, keyless entry, and interior electronics when the main battery is not active. Despite its modest size, the EK151 meets the demands of modern vehicle systems thanks to its advanced AGM (Absorbent Glass Mat) technology, which ensures excellent charge acceptance, vibration resistance, and long service life. This technology is ideal for frequent charge-discharge cycles, making the EK151 a solid choice for start-stop enabled vehicles that rely on auxiliary battery support.

With dimensions of 150 mm in length, 90 mm in width, and 145 mm in height, the EK151 does not correspond to any standard battery group sizes commonly found in European or Asian vehicles. It is uniquely compact, making it ideal for specialized placements such as beneath seats, inside luggage compartments, or within engine bay compartments designed specifically for auxiliary batteries. Its low profile and narrow build make it particularly valuable in vehicles where space optimization is a key factor.

One of the key distinguishing features of the EK151 is its terminal layout. It has a non-standard terminal configuration—layout 1—which means the positive terminal is located on the left-hand side. This can be particularly important for specific OEM configurations, and installers must ensure correct placement to avoid polarity issues. Additionally, the battery uses JLR (Jaguar Land Rover) style terminals, making it a direct-fit replacement for a number of vehicles from that manufacturer.

The EK151 also uses a B0 mounting configuration, which means it does not have a bottom hold-down ledge—unlike the more common B1 or B13 styles. This type of mounting is less typical and suggests that the battery is secured using top clamps or custom enclosures rather than universal base brackets. Installers should be aware of this detail during replacement to ensure proper fit and secure installation.

In summary, the Exide EK151 is a high-quality auxiliary AGM battery engineered for modern vehicles with complex electrical systems. Its compact design, specialized terminals, and unique mounting make it ideal for specific OEM applications—especially in vehicles where space is limited and auxiliary power is essential. With the reliability of AGM technology and Exide’s expertise in automotive energy, the EK151 ensures stable and lasting performance where it matters most.

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