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Concentrations and Credit Risk (Details 2) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Sales of finished goods |  | $ 8,089,804 | $ 5,589,371 | $ 17,532,415 | $ 14,952,470
Proceeds on disposal of patented proprietary technology offset against amount due to a former subsidiary (Note 6) |  |  | 13,034,583 |  | 13,034,583
Bak Shenzhen [Member] |  |  |  |  |
Purchase of inventories | [1] |  |  | 65,102 | 108,718
Sales of finished goods | [1] |  |  |  |
Zhengzhou BAK Battery Co., Ltd [Member] |  |  |  |  |
Purchase of inventories | [2] |  |  |  | 2,062,432
Sales of finished goods | [2] | 1,941,101 |  | 1,941,101 |
BAK Tianjin [Member] |  |  |  |  |
Sales of finished goods |  |  | 4,073 |  | 31,610
Zhengzhou BAK New Energy Vehicle Co. Ltd [Member] |  |  |  |  |
Purchase of inventories | [3] |  | $ 3,838,213 | $ 3,838,213 |
[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 September 30, 2019 and December 31, 2018, payable to Zhengzhou BAK Battery Co., Ltd were $2,219,441 and $2,291,261, respectively, was included in trade accounts and bills payable and $2,113,251 and nil was included in trade accounts and bills receivable, net.
[3] | Mr. Xiangqian Li, the former CEO, is a director of this company. As of September 30, 2019 and December 31, 2018, payable to Zhengzhou BAK New Energy Vehicle Co., Ltd were $4,162,895 and nil, respectively, was included in trade accounts and bills payable.

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