OptimumNano Energy Co., Ltd is a leading manufacturer of LiFePO4 batteries in China, producing 500,000 battery cells per day. Founded in 2002, it has over 5,000 employees including 1,000 R&D engineers. OptimumNano focuses on developing and mass producing LiFePO4 batteries for electric vehicles, energy storage, and engine start applications. It has 273 patents and supplies batteries to many major Chinese automakers and bus manufacturers, with batteries installed in over 30,000 EVs worldwide.