Johnson Controls International plc, headquartered in Cork, Ireland with operational bases in Milwaukee, Wisconsin, is a global leader in building technologies and solutions. Founded in 1885, the company has a long history of innovation in HVAC, fire safety, and security systems. For many years, Johnson Controls operated the world’s largest automotive battery business through its Power Solutions division, which included the iconic VARTA brand. VARTA, originally founded in Germany in 1887, became part of Johnson Controls in 2002 and supplies a comprehensive range of lead-acid and AGM batteries for passenger cars, commercial vehicles, and advanced start-stop systems. The VARTA product line is renowned for extended service life, low corrosion, and minimal maintenance, earning trust from global automakers and a strong reputation in the aftermarket. The company’s building technologies segment delivers integrated solutions for energy efficiency, intelligent buildings, and sustainable infrastructure, serving over one million customers worldwide. In 2019, the automotive battery division was divested to form Clarios, but the VARTA brand remains a significant legacy in the automotive aftermarket. Today, Johnson Controls focuses on smart building solutions, leveraging IoT, AI, and cloud-based analytics to optimize building performance and occupant comfort. As a Fortune 500 company, it operates in more than 150 countries with annual revenues exceeding $23 billion. Its deep expertise in energy storage and battery management continues to drive innovation in building-related energy applications and microgrid systems.