SD PowerGroup Limited was founded in 1981 , has been working in the field of high-tech Uninterrupted Power Supply (UPS) and Lead Acid Battery of research & development, production, trade and services more than 20 years.SD is a member of China Power Supply Society (CPSS). National-level High and New Technology Enterprise. Nominated supplier of Government procurement site. There are three representative offices in the Greater China area, they are located in Beijing,Shanghai and Shenzhen. Factories covers 90,000 Square Meters.All products passedISO, UL , CE ,CSA ,CEC ,ect certifications. Have been exported to more 98 countries . OEM/ODEM service offered. Quality Control and Service is SD Group Life !