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The Audi A4 has gone through significant changes across its generations, not only in terms of design, technology, and performance, but also in the evolution of its battery requirements. From the early B5 generation to the modern B9, increasing demands on vehicle electronics, comfort features, and efficiency systems such as start-stop technology have led to a steady progression in battery specifications.



The B5 generation of the Audi A4, produced from the mid-1990s, relied on relatively simple electrical systems by today’s standards. This generation used standard lead-acid batteries with capacities ranging between 55 Ah and 78 Ah, and cold cranking amperage (CCA) values from 460 A to 780 A. These specifications were sufficient to support basic functions such as lighting, engine management, and climate control without the additional strain of modern start-stop systems or advanced infotainment.



The B6 generation introduced around the early 2000s showed a moderate increase in battery capacity needs. While still using standard batteries, the maximum capacity went up to 90 Ah, and the CCA reached up to 800 A. This reflected the gradual increase in onboard electronics, such as power seats, more advanced climate systems, and enhanced lighting. The electrical load had grown, and accordingly, the battery needed to deliver more power and stability.



With the B7 generation, a turning point in battery technology within the A4 lineup becomes evident. Although most B7 versions still used standard batteries with capacities up to 110 Ah and CCA ratings as high as 920 A, certain models adopted AGM (Absorbent Glass Mat) batteries. These more advanced batteries were introduced in select configurations that required higher performance and deeper cycling ability, often related to enhanced comfort features or specific engine setups. The presence of an AGM battery with a fixed specification of 95 Ah and 850 A CCA in this generation marked the beginning of a shift toward more robust battery technologies.



The B8 generation, continuing this trend, saw a broader division in battery requirements. While many versions still used standard batteries (from 55 Ah to 100 Ah, with CCA ratings ranging from 460 A to 900 A), more demanding variants switched to AGM batteries with capacities up to 82 Ah and cold cranking power up to 800 A. The growing number of electronic systems and efficiency features meant the battery had to perform reliably under more strenuous conditions. Start-stop systems began appearing in this generation as well, leading to further reliance on AGM technology for durability and performance.



Finally, the B9 generation marked the full integration of start-stop technology and the dominance of AGM batteries across the lineup. Battery capacities range from 70 Ah to 96 Ah, with CCA values between 720 A and 850 A. This generation’s vehicles are heavily dependent on electronic control units, advanced infotainment, and driver-assistance systems, all of which demand a stable and high-performance power supply. AGM batteries meet these demands by offering better charge acceptance and greater resistance to deep discharges, which are common in start-stop applications.



Select your specific Audi A4 version from the list below to see which batteries are compatible with each engine configuration.