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Concentrations and Credit Risk (Details 4) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Sales of finished goods |  | $ 22,194,348 | $ 24,433,304
Proceeds on disposal of patented proprietary technology offset against amount due to a former subsidiary (Note 6) |  |  | 12,845,795
Bak Shenzhen [Member] |  |  |
Purchase of inventories | [1] | 63,950 | 107,280
Sales of finished goods |  | 526,719 |
Zhengzhou BAK Battery Co., Ltd [Member] |  |  |
Purchase of inventories | [2] |  | 2,032,756
Sales of finished goods | [2] | 3,961,050 |
BAK Tianjin [Member] |  |  |
Purchase of inventories |  |  | 36,766
Sales of finished goods |  |  | 31,610
Zhengzhou BAK New Energy Vehicle Co. Ltd (b) [Member] |  |  |
Purchase of inventories | [1] | $ 3,812,819 |
[1] | Mr. Xiangqian Li, our former CEO, is a director of this company.
[2] | Mr. Xiangqian Li, the former CEO, is a director of this company. As of December 31, 2018 and December 31, 2019, payable to Zhengzhou BAK Battery Co., Ltd were $2,291,261 and nil, respectively, was included in trade accounts and bills payable.

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