The Varta Battery 80 AGM, often the Varta Silver Dynamic AGM model (code 668 or F21), is a high-performance 12V Absorbent Glass Mat battery with 80Ah capacity and 800 Cold Cranking Amps (CCA), ideal for modern cars with demanding Start-Stop systems or many electronics, known for its three times longer cycle life than conventional batteries, though it requires full charges and is more costly