discount All in One Energy Storage System Dongjin Group is a company dedicated to the production, R&D and sales of lead-acid batteries, Lithium battery packs and lithium battery cells. Headquarters located in Shenzhen. Dongjin Group has established lithium battery and lead-acid battery factories in Dongguan, Guangdong Province and Xingan County, Jiangxi Province respectively.website:http://www.dongjin-battery.com/