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Concentrations and Credit Risk (Details 2) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Sales of finished goods | $ 4,270,936 | $ 6,050,302 |  | $ 9,442,611 | $ 9,363,099 |
BAK Tianjin [Member] |  |  |  |  |  |
Purchase of inventories |  |  |  |  |  |
Sales of finished goods |  | 17,457 |  |  | 27,537 |
Shenzhen BAK [Member] |  |  |  |  |  |
Purchase of inventories | 65,102 | 111,548 |  | 65,102 | 111,548 |
Sales of finished goods | 685,211 |  |  | 769,052 |  | [1]
Zhengzhou BAK Battery Co., Ltd [Member] |  |  |  |  |  |
Purchase of inventories |  | 2,116,111 | [1] |  | 2,116,111 | [1]
Sales of finished goods |  |  |  |  |  |
[1] | Mr. Xiangqian Li, the former CEO, is a director of this company.

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