Shenzhen Desay Battery Technology Co., Ltd. and its subsidiaries research, design, develop, produce, and sell lithium battery power management systems, energy storage cells, and related packaging integrated products in China and internationally. Its activities include small and medium-sized lithium battery packaging and integration, system-in-package (SIP) research, manufacturing and testing, battery manufacturing and sales, energy storage technology services, and battery leasing. It also offers power management systems and packaging integration for large power batteries, energy storage batteries, and other power management systems, with products used in smartphones, power tools, and other small and medium-sized devices. Formerly Shenzhen Worldsun Enterprise Co., Ltd., it changed its name to Shenzhen Desay Battery Technology Co., Ltd. in June 2005, was founded in 1985, and is based in Shenzhen, China.