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Concentrations and Credit Risk (Details 2) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sales of finished goods $ 5,171,675 $ 3,312,797
BAK Tianjin [Member]    
Purchase of inventories 480
Sales of finished goods 10,080
BAK Shenzhen [Member]    
Sales of finished goods [1] $ 83,841
[1] Mr. Xiangqian Li, the former CEO, is a director of this company.