Samsung SDI is a subsidiary of the Samsung Group. It was formerly a cathode-ray tube production division. Today the company's business operations center around lithium battery technologies. Samsung SDI produces batteries for small mobile devices and PCs; batteries for automobiles such as cars, bikes, and motorcycles; rechargeable electric tools such as screwdrivers, gardening tools, and vacuum cleaners. With its charging technologies, Samsung SDI also launches energy storage systems and related products and services.